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Diabolical Artificer
United Kingdom
Registrace 28. 01. 2013
Vintage electronics, test gear and DIY/homebrew valve amplification.
Sterns Stereophonic Pre-Amplifier - Evaluation - Part 1.
Identification, appraisal & evaluation of a vintage Stern's Preamplifier.
zhlédnutí: 186
Video
Odd Fault On A Valve Amplifier.
zhlédnutí 155Před 16 hodinami
Bit of a filler video, busy doing other stuff, chewing gum for the eyes.
Valve Amp Delayed Start- Fault Finding & Wotnot.
zhlédnutí 2,7KPřed 21 dnem
Fun & games getting a delayed/soft start working & power supply blowing fuses. Motorbike startup.
Fault finding & fixing a valve amp.
zhlédnutí 1,4KPřed měsícem
Had an issue on the BGA - big green amp, fixed it.
Valve/Tube Matching - Is It Important? Matching 807's
zhlédnutí 673Před 2 měsíci
What are matched valves? Does balance in a fixed bias PP amplifier matter? Quick matching of valves for the 50w monoblock's & testing an unbalanced OP stage.
Testing 807 Beam Tetrode Valves/Tubes - Part 1.
zhlédnutí 349Před 2 měsíci
Bit of a long winded video, but this hopefully shows that testing valves isn't always straight forward & that the results can often be confusing & ambiguous.
Sanyo G-2615 N Briefcase Music Center.
zhlédnutí 953Před 2 měsíci
Repair not a refurb of a 1972 Sanyo music center. In this video there is no mention of politics, only electronics.
50w Class A 807 PPP Valve Amplifier Refurb - Part 2
zhlédnutí 639Před 2 měsíci
`Further work on improving the amplifiers.
50w Class A 807 PPP Valve Amplifier Refurb - Part 1
zhlédnutí 779Před 2 měsíci
Refurbishing valve amp monoblocks.
DIY Valve Tester - Penultimate Episode.
zhlédnutí 156Před 2 měsíci
Some progress, a few steps forward, several steps back. Ran out of steam, getting nowhere fast, time to take a break.
DIY Valve Tester Build - Part 4.
zhlédnutí 293Před 3 měsíci
The front panel is provisionally built. A look at various simple high voltage variable power supply designs. A quick emission test of an ECC82 & 6V6 to access progress so far.
DIY Valve Tester Build - Part Three.
zhlédnutí 1,2KPřed 3 měsíci
Designing, building & testing the variable bias power supply. Building the variable heater/filament power supply. Testing power supply's for high frequency diode switching noise: eliminating test setup anomaly's.
DIY Valve Tester Build - Part Two.
zhlédnutí 382Před 3 měsíci
Metal fabrication - how to chain drill large holes. Building a valve regulated power supply - testing & fitting.
DIY Valve Tester Build, Re-Build - Part 1.
zhlédnutí 637Před 3 měsíci
I built this basic valve tester about 14 years ago, it was a basic emission tester. I'm going to re-build it with a bit more functionality. The ability to test gm, as well as a beefed up current capability and a better high voltage anode supply using a valve regulated power supply.
How to stick loose valve bases.
zhlédnutí 197Před 4 měsíci
What it says up there. Fixing loose valve/tube bases with petrol or gasoline.
Rewinding A Mains Transformer - Tek 585A - Part 7 - Final.
zhlédnutí 530Před 4 měsíci
Rewinding A Mains Transformer - Tek 585A - Part 7 - Final.
Fitting a Transformer Into a Tek Scope - An Hour in the Workshop.
zhlédnutí 1,3KPřed 5 měsíci
Fitting a Transformer Into a Tek Scope - An Hour in the Workshop.
Rewinding A Mains Transformer - Tek 585A - Part Five.
zhlédnutí 405Před 5 měsíci
Rewinding A Mains Transformer - Tek 585A - Part Five.
Rewinding A Mains Transformer - Tek 585A - Part four.
zhlédnutí 300Před 5 měsíci
Rewinding A Mains Transformer - Tek 585A - Part four.
Mailbog #5 A Look at Some Stuff - The Kindness of Strangers.
zhlédnutí 207Před 5 měsíci
Mailbog #5 A Look at Some Stuff - The Kindness of Strangers.
Rewinding A Mains Transformer - Tek 585A - Part Three.
zhlédnutí 2,4KPřed 5 měsíci
Rewinding A Mains Transformer - Tek 585A - Part Three.
Rewinding A Mains Transformer - Tek 585A scope - Part Two.
zhlédnutí 589Před 5 měsíci
Rewinding A Mains Transformer - Tek 585A scope - Part Two.
Rewinding a mains transformer - Tek 585A scope - Part One.
zhlédnutí 603Před 6 měsíci
Rewinding a mains transformer - Tek 585A scope - Part One.
Making a transformer bobbin by hand - Tektronix 585A scope.
zhlédnutí 607Před 6 měsíci
Making a transformer bobbin by hand - Tektronix 585A scope.
Electronic Fault finding - Vellerman RIAA Pre Amp Part 2.
zhlédnutí 153Před 7 měsíci
Electronic Fault finding - Vellerman RIAA Pre Amp Part 2.
Money saving tip # 1.How to save money with a stick.
zhlédnutí 134Před 7 měsíci
Money saving tip # 1.How to save money with a stick.
Electronics Fault Finding - Vellerman RIAA Pre-Amp - Part 1.
zhlédnutí 794Před 7 měsíci
Electronics Fault Finding - Vellerman RIAA Pre-Amp - Part 1.
Testing an 805 Triode - Positive Bias Part 2.
zhlédnutí 258Před 7 měsíci
Testing an 805 Triode - Positive Bias Part 2.
Building a 1000v 0.5A Power Supply - Testing A Big Triode.
zhlédnutí 1,7KPřed 8 měsíci
Building a 1000v 0.5A Power Supply - Testing A Big Triode.
Valve Preamp Final Test - OP Impedance Test.
zhlédnutí 452Před 8 měsíci
Valve Preamp Final Test - OP Impedance Test.
looks nice looks copy of a leek stereo you always need a cathode follower i found to drive turns out to have a lot of noise
Nicely built as mentioned, released prior to the Leek I think. TFW.
Excellent video! That's a sought after pre-amp. I have a few sterns 5-10 mono amps in the garage but only the very simple mono pre-amps that went with them. PS If you were at Stonehenge in 1988 the Alan Lodge Diary pages brought back some memories (the baton charge being less good!)
Thanks. Didn't know they were sought after. Some of the Mullard amps sound pretty good, worth getting em out? I wasn't at Stonehenge in 88, last time I went was 82 I think. I remember a few festy's where the valiant boys in blue stomped about but wasn't on the end of any violence unlike a few folk I knew. A friend had a miscarriage after the Beanfield, still makes my blood boil that one. Anyhoo, i'll look out for the, is it a book, in question. TFW
@@diabolicalartificer Hi Andy - I can't watch the footage of the Beanfield without getting angry and upset too. The approach taken during the miners strike became standard I think. Anyway if you search the interweb-thingy for Stonehenge 1988 you'll see the few pics and pages called the Alan Lodge diary.After all that the day was overcast - great sunrise (not).
@@BrumAdam I heard a story that a small convoy was passed by a coach full of coppers who'd been policing the minors strike, as the bus of gavvers passed the travellers, they put up a sign "your next". whether true or not, no idea. On the same subject whilst living in Norfolk, early 90's, I met a local copper who told me he was drafted in to police the miners strike in 84. He told me whilst he and the other country police were amicable with the minors, the Met were a bunch of animals & well up for violence: having been nicked by them for possession of LSD late 80's, I concur. Just had a quick look at the Alan Lodge pages, thanks for the heads up, this site has some great content - .ukrockfestivals.com/index.html too. Saw a few familiar faces, looked like Helen the Hat sitting on the front of the coach PDL 514, don't recognise the model Grovesner? Looking at the pics took me right back, it was another world, not just in terms of the traveller scene but in general. Mate, I could fill the comments section with recollections, I hope one day we could meet up & have a few beers & a smoke & a natter. As they said back in the day before lighting a chillum "Ali Om Om Siva"
Hi Andy, Really enjoyed that as it’s very relevant to my current 807 build project. No doubt if any of my 807’s are ‘gassy’ then it will become apparent! : )
Glad you got something from this video. Valves, especially transmitting valves like the 807 can do some weird shit like, self oscillate, negative resistance, gassyness or your test setup can influence the result. That said I've had no trouble with them in an amp. Usually after a few hours they settle down.
When you are used to troubleshooting complex problems, one sometimes fails to check the simple things.
Yep, it's a truism. TFW.
Very wise words! Always check the basics first, although it is not usually obvious that something like a valve base is the issue. I have torn my hair out many times trying to figure out issues, and then I bumped the amplifier by accident or something and figured out that it was just a bad connection somewhere heh. Looking forward to your next videos as always :D
You've been there : ) I often forget this though & go looking down a mine shaft. Thanks for your kind words as always. TFW.
Wise words, sir! PS Great thumbnail pic
Thank you. Thought you might like it, takes you back? What happened to crusty chic?
I have no idea why it's taken youtube so long to offer me one of your videos in my feed, but here we are. <3
The ways of the CZcams algorithm are mysterious, obscure and verily most perplexing. Now you've found the Knights of The Thermionic Valve after three days of hideous torture you'll be given the password & a copy of the Big Red Book. Welcome Brother. : )
I saw your scope probe was still set to 1x. Set it to 10x! The 10x mode has much lower capacitance and is safer to use for these applications. If your Darlington pairs transistors aren't low enough Vbe you could build a discrete Sziklai pair.
Well spotted. I used the 1x because the amplitude was small, my scopes lowest setting is 50mV P-P/div unless I switch it onto 10x gain. It's an old scope & temperamental at hi gain. Again your right, there's better circuits I could use, in this case I wanted a quick solution using what parts I had. TFW.
@@diabolicalartificer The 10x mode on your scope should only be changing the way the numbers are reflected unless you're using an analog scope :) The lower capacitance of the 10x mode is significant when you're working with tubes, because the capacitance of the probe can actually significantly change the behaviour of some very low current high voltage tube circuits.
Hi Andy, having had my fair share of delay start demons to deal with as you know, I’m glad you managed to sort it in the end. Looking forward to the sound test through your big speakers ! : ) Your bike sounds great as well! : )
Aye, it's been an interesting week, got there in the end. TFW
fun stuff building valve amps and goodies
Sometimes fun, sometimes maddening. That said it's more interesting when things go wrong. TFW.
Another good video. Cheers! Liked the bike and tank artwork too. ATB Adam
Thank you. Though the paint finish isn't 100%, I'm happy with how the tank turned out. TFW, take care.
Can't wait until you get the bike fully going. It's been a long haul on it. Odd that the amp was working fine them the diode failed. Chineseium part? I've been had by counterfeit parts off one site by a certain seller.
Me too, it's nearly been 3 years. I think the amp started playing up because of all the frequent powering on &off with relatively short times between each. The diodes are NOS BYW56C I think, 1000v 1A Avalanche power rectification diodes. I try to limit my purchases the best I can from the PRC. Futile probably but.
@@diabolicalartificer The venerable classic 1N4007 is a fine replacement for a rectifier that needs to do 1 A at 1000 V. They aren't suitable for high frequency rectification, but mains frequency is well within its capacity. The BYW56C is *not* a 1 A diode though! It's a 2 A diode. The RL207 is a part I frequently use these days, as it's far cheaper than the older alternatives that are high power silicon rectifier diodes. It *is* rated for 2 A operation. The older one I used to stock was the 1N5408, and you may actually have some in stock if you've got any parts from anywhere.
@@AnnaVannieuwenhuyse Again, your right, I'm getting on in years, my brain is a bit buggered, I make frequent mistakes & chuck these video's together. You know your stuff, thanks for the tips.
@@diabolicalartificer All good mate! You do you :) I would've felt guilty not correcting a small factual error that could cause you to choose the wrong part :O
what a strange thumbnail… 🫢
Aye, looks like a hide the lightbulb pixie has been caught on camera. Now where's that damn lightbulb? TFW # 1 Daughter.
@@diabolicalartificerwatched the video, I see you’ve exposed a bit of leg 😳 views are going to go up tenfolds after this exposure
@@mollyeaw Good news, I've put my legs away, got fed up with the women banging on the door begging to see my knees.
😂
Yeah lol ❤
Hi , Thanks for the review of this Sanyo Music Center , appreciate the time you take to explain things and showing so much inside the unit. I have just purchased a G2612N, which is very simular in New Zealand . Look forward to any undates of this unit , Great video 👍🏻.
Great video. I love your approach and the 'fat lass on a trampoline' analogy
Thanks, although the analogy is nicked off Terry Pratchett, the line in the book is "she could flounce like a fat lass on a trampoline" from Making Money. It is a very visual metaphor : ) TFW.
I recently built a small valve amp, mostly as a fun little project and also for something I can use to connect a pair of headphones to my 43-inch Blaupunkt HDTV, the amp itself is what's called an OTL (Output Transformerless) Headphone Amplifier that uses three Svetlana 6N1P twin-triode valves, one of the 6N1P valves has its two triodes wired as standard common-cathode voltage-amplifier stages, the other two 6N1P valves are wired in a configuration known as a White Cathode-Follower which acts like a push-pull output stage, very simple circuit, but it sounds wonderful, it is able to easily drive my Audio Technica ATH-M50X headphones, rated at 38 Ohms impedance, plenty loud enough, the sound is crystal clear, and from what I read in the original webpage articles I built it from, frequency response is ruler-flat from 10Hz to 100kHz where it gently rolls off, I had a lot of fun building it.
Sounds like a cracking little amp, was it your first foray into valves? I've a few big meaty triodes stashed, keep meaning to build a little headphone amp. TFW.
big green boy
Indeed. TFW.
I'm so happy to see you back! I hope you'll feel fully back on your feet soon! ❤ And a interesting fault, I know how it is with forgetting to change a pot for example when you redesign something. That has happened hundreds of times for me it feels like, heh. Neat little buffer you made! Simple but effective! I love the big green amp a lot, it's such a beauty and I love all your little features on it! I'd love to buy it from you if you do want to sell it like you mentioned, I just fear what the shipping price would be... But we could look it up :) I'd use it every day for my main speakers, having a piece made by you would also feel very special to me since you are one of my biggest inspirations and also have taught me so much thanks to your calm and very well done explanations of things :) You were the person who gave me the confidence to actually start building my own valve amps and do testing and all that and I am forever grateful for that! This hobby is the most fun I've ever had :) See you next time! I'm excited!
Thank you, your very kind. I'm glad my video's have inspired you. Are you in the UK or overseas?
Beautiful work.
Thank you, that means a lot, been following & admiring your work for years, all the best.....DA.
Nicely demonstrated ,hats off sir !
Thank you, & thanks for watching.
Hi Andy, just revisiting this monster you built way back, what was the pri of those outputs please? I can see they are Hammond 1650 series but curious to know the Z? Cheers Ian
They are if I remember right Hammond 1650TA Z pri 1k9, this was my first amp design/build though it took quite a few goes to get it about right.
Thank you father 😁 although don’t appreciate the slander at the start…
The U.S. Military often had 50 or 100 hour burn in on certain tubes to stabilize them. Any tube is going to have characteristics changes as it ages. Yes, correct, you will run in circles trying to match tubes and still never really succeed. There was quite a discussion on "Matching" tubes I read. Some sellers only match brands, some match date codes, and some match who knows what. I remember rebuilding an old Minschel organ as a Mothers Day surprise gift to my mother. My friend was an organ repairman and he saw my pile of new tubes for it. He told me don't put new tubes in, but put used ones in. If I had put new tubes in, he told me it was very likely he would have to retune it a couple of times, due to characteristics changing as they age. I installed used tubes, and the tuning stayed pretty accurate until she passed away, when I sold it.
Yep, Tektronix did too in their 500 series valve scopes. Made that mistake, pulled a 6DJ7/ECC88, put in a new one, scope didn't work. That's a grand story, TFW.
My all "matched" tubes after few hour of playing are now not matched:)
Yep, valves can be tricky buggers. TFW.
Cheers for doing that video Andy, that subject has been on my mind a lot regarding “matched” pairs and how important it is. Your experiments / tests have proved it seems not? Looking forward to the sound tests, bung a bit of dub on! : ))
No worries. As I said when you buy "matched" pairs or quads I've not seen a seller spec what %age, Va, Vg1k, Ik or gm. Also the matched quads I've bought in the past weren't matched when I put them in an amp. I had to get in touch with the seller & spec the test conditions/match them myself. But as you've seen, does it really matter in terms of THD %? It might make more of a difference in an amp that uses one common cathode R, like in a Quad 2, say for CMRR. Suggestions for dub tracks? Best dressed chicken in town? Prince Fari?
@@diabolicalartificer How about Kunte Kinte Version One by the Revolutionares ?
@@ianmorgan6104 Not heard that one, just listened to it, the version I found isn't the best quality, but yeh, not bad. I remember Roots, long time ago. I like the old stuff but quite like newer stuff like Sumac Dub - Jardin De Lucy.
Andy- Many of my tube testers have ferrite beads on the wires to prevent any oscillation. Hickok and Seco use them on just about every wire, IIRC. Please keep in mind that it was very common for tube companies to buy from each other, then put their own brand name on them, but the mfg. codes WILL be different, no matter which brand is stamped on the tube. Please keep in mind that a tube which shows a bit of gas, if run for several hours at about max current, can sometimes heat up enough to cause getter material to activate again. Good progress on the project.
Never had much luck with ferrite beads but as you say, they do work. Will try the oven, did try leaving the heaters on to no avail. TFW.
A really interesting and informative video. Cheers! Any old valve with a 'flying saucer' getter came from the USSR (in fact current Russian production still has them I think?).
Cheers. Your bang on, made in the USSR that once was.
Excellent video mate
nice
Nameste, & thanks for watching.
Really interesting and cool piece.. ✌️
Funny thing that I couldn’t find a station to listen to on my radio either all I got was a load of hiss 🤷🏻♂️
It could mean the radio or power supply needs looking at. That said there is hardly anything to listen to nowadays on SW & AM, but as you can hear this one picks up FM very well. TFW.
Hi Andy, I’m glad you had a look at the briefcase music centre. My brother often goes to boot sales looking for records and picked it up for a few quid years ago. It was knocking about in my shed then van for ages and I couldn’t bring myself to throw it away. As you say it’s what a lot of people listened to back in the day and was part of the pop culture of its time and amazing it still works after 50 odd years eh, even though it sounds a bit iffy! : ) Thanks for making the video 👍
Yep, 52 years old and still works mostly bar a few components. How many Iplonks will still be functional in 2070? I'll do more work on it some time, need to have a word with the boss.
beast
Yet to be unleashed. TFW.
I too like repairing my pots instead of replacing them - that also applies to all my other projects, no matter if it is a valve amp, flourescent lamp, electrical project, vehicle, solar power, you name it! I repair and reuse everything I possibly can. I have a VERY limited budget, so yeah, I make do with what I have and can find! I also reuse parts from old projects whenever I get tired of them! So nothing goes to waste, ever! Many of my things are trash picked, and repaired/restored to useful shape - my flourescent lights in my off grid solar power shed is a great example! I like them a lot, and they came right out from the dump! I recently aquired a generator set that I am repairing, the connecting rod bearing is bad, it knocked like hell! So instead of trashing it, I am going to replace the connecting rod. Just gotta wait for it to arrive from ebay! was not that expensive either, so soon I'll have a good little generator to use whenever it gets dark and cold, and the solar panels arent doing anything :D
Me too, hate throwing stuff away. Have kept an old Panasonic vacuum cleaner going for nearly 20 years, my daughter finally managed to get me to admit it's cleaned it's last carpet: it was a hard struggle, she won : )
Hi andy! Been a while since I have been able to spend lots of time watching videos :) Thats why you havewnt heard from me in the comments for so long! Im so happy to see more valve amp vids from ya! Been really missing you! I love these monoblocks, I am excited for the day you pull out the big speakers and crank em up :D I want to do that with my tube amps I have built and restored aswell, bring out some of my big PA speakers and crank em up, I have some folded horn subwoofers that can be used with them and together with some good midrange and tweeters, it's gonna pound really good! Anyways I hope you are doing well, I love your work, never ever give up! You are one of my biggest inspirations. If you feel down, please know that I'm thinking about ya :) I go on vacation on friday, and I am so excited to finally be able to relax and watch many of your videos, work on my own valve amp projects (recently started a new one!), continue with my flourescent lamp installation in my solar powered shed, replace my worn out batteries with some new ones, and maybe go on a bit of a trip with my car somewhere too! best wishes from your swedish viewer, Lennon! <3
Thank you, your kind words mean a great deal. Struggling a bit at present to put video's out, comments such as yours make a difference. TFW & best regards to you too, have a good holiday.
Nice. Are you going to add any ventilation for the chassis? That should lengthen the life of the components & transformer.
There's a 4" fan in each one pushing air past the OP valves, I'll try & remember to show them in the next video. TFW.
Hi Andy, great progress on those beasts! Inspiring stuff , looking forward to the next inststallment : )
Getting there mate, you'll get there too one day hopefully. TFW.
Those Cannon type connectors, at least the ones used in aircraft take a special what I call a 360 deg crimping tool. I have the ones needed, fortunately. Glad to know I am not the only one who forgets to put covers and fastening rings on harnesses. I forgot one on a 40+ connector., then had to disassemble and re-do. I finally taped paper notes to any cable that had a multi part connector, and that really helped.
Aye, Cannon & other similar connectors had special crimping tools & probably jigs to make the connection. I remember my Mum circa 1970 knocking up looms etc at home, all piece work, so many pence per connector/ loom. TFW.
I'm with you on wiring stuff up and finding the part of the connector that I should have threaded the cable through sat on the bench! Arrrrggggghhhhhhhhh!!!! I bet everyone has done that at some time or another too🙄
You've been there too? Yep, it's a right of passage thing. TFW.
had you thought of using a 100 ohm 1/4 watt resistor as a fuse in the anode supply
I hadn't but the gm pcb uses a 100r "sense" resistor. I have put a 100r on the screen grid supply & have been having a think about this problem, but will do some experimentation first before coming to conclusions. TFW & for your input.
I like the feature to test the split filament tubes. Some tube testers just put voltage across the fil and not the tap. The tap is crucial in any radio that uses a pilot lamp across the rectifier filament. I really appreciate your explanation of how your circuits work. I still learn a bit on every one of your videos. I am wondering if a MOV circuit or an SCR crowbar might be able to damp the surge that blows the PS parts. That was one big arc in the 807. Maybe one of the varistors. I know Zenith used them in their TV sets for a long time. Take Care.
Glad you get something out these video's. A MOV might work but a crowbar may be too slow. I'm still not sure what it is that zaps the power supply. Is it an over current, over voltage or what? I haven't the test gear to catch & record events this fast. TFW.
@@diabolicalartificer I gave it a lot of thought- Do you think it might be a transient spike feeding back? Maybe an additional fast high current & voltage blocking diode in series with out feed of the PS to the tube.
Thanks :) Sorry for the delay in replying. I have been a bit busy myself. 5:07 to 7:14 The MPSA92 and diodes are a constant current source(approx 0.5mA) to feed the Zener diode. Zener's provide the best voltage regulation when they are fed from a constant current source. When the circuit is switched on the MPSA42 is not conducting. Providing a high voltage to the gate of the MOSFET. Which conducts feeding a voltage to the 330k, pot and 20k voltage divider. This is the voltage regulation feedback. As soon as the voltage on the base of the MPSA42 exceeds the Zener voltage + 0.65V the MPSA42 starts conducting to provide voltage regulation. 7:15 to 9:30 I agree that the there is a problem with the placement of the 100 ohm resistor in the emitter leg of the MPSA42 in this circuit. I would move it to the base leg of the MPSA42. As used in many bipolar power amplifiers for the short circuit protection of the output transistors In the first circuit with its 22ohm resistor limits the current to 14.3 mA. If you are using the first circuit then that would explain why you were having problems with the 6V6GTA valve. You were hitting the buffers so to speak. 9:30 to 11:15 Steve Benches circuit: 10:09 It is an IRF820 not 320 I agree that the there is a problem with the placement of the 100 ohm resistor in the emitter leg of the MPSA42 in this circuit. I would move it to the base leg of the MPSA42. As used in many bipolar power amplifiers for the short circuit protection of the output transistors The Anode supply with the 10 ohm resistor limits the Anode current to 65ma. If you have an anode to cathode short that would be between 23 and 33 watts of heat across the IRF820 So heat sink for 50 Watts which is their maximum heat dissipation. The Screen grid supply uses a 22 ohm which limits the current to 14.3ma. If you have a screen grid to cathode short that would be between 5 and 7.5 watts of heat across the IRF820 So heat sink for 10 Watts which is their maximum heat dissipation. BTW I provided you with a straight unmodified version of Steve Bench's RAT tester circuit and a LTSpice 'build' of circuit. ok it was a low res gif of the circuit. I would make some serious modifications myself. But here is a link to all the design and all the build details for Steve Bench's RAT Tube tester. diyaudioprojects.com/mirror/members.aol.com/sbench101/#TubeTest
Bless you, thank you very much for that thorough explanation. I know I only used part of the circuit, without the zener string etc to select hi/lo V. I changed the values of a few components so the circuit can pass more current as I test some big valves. All the best, ...DA.
Poor design, there are a lot better ones around, keep searching on google. Don’t build this.
Poor design? How so? Yes there are better design's out there, I did it this way to suit my way of working & use some parts I had. Thanks fo your IP.
what kind of valve are you testing?
It says up top there George in the description, a 6V6 & ECC82.
Pretty good start for a man under the influence....
I killed one ECC82 which I didn't put in the video, so don't drive under the influence.
So far, looking good.
Getting there, slowly.
Great video, love the sound effects.
Thanks : )
Good progress. I am really interested in seeing this completed. I am still working on the tube tester for transmitting tubes, but have made little progress since the medical problems cropped up.
Thank you, you'll hopefully get there one day.
Excellent stuff Andy! Looking forward to your next one
Much appreciated, TFW.
Cracking on nicely......
Thanks, TFW.