Video

Just beginning to build stereo tube amps. Ran across this software on youtube. Simply excellent. Thanks so much for your efforts. Greatly appreciated.

Simpler solution : Dab a black marker pen on the LED.

Excellent video!

Hello!, I am a desperate dad with physical limitations, who wants but cannot work outside the home, I wanted to make an improvement to my desktop machine and I bought this kit a few months ago, mine has a ground pin, I tried both voltages 110v and 220v, I have not been able to make it work, I thought I had damaged it so I ordered another one and I am in the same situation, where it does not work. does nothing. I have watched countless video tutorials and I can't find my problem. WHAT DO YOU ADVICE ME TO DO

Looks like a lot of trouble with 12V AC and a voltage doublers instead of using a switching boost converter to convert 12V DC on the supply to 250V.

Are there parts no longer available for the GT-750?

hi dear, is there possible to preamplifier a dynamic mic ou a guitar adapting a plug or respective cable? if yes, can wee add tube distortion?

Your software is awesome, sadly is not well know. Have you ever ponder the posibility to make it work with other harware?

Does it work also with Analog Discovery 3 ?

What an incredible project. I realize this is old, but if the OP is still out there.. where can we find more details?

Hello and thank you very much for the excellent review I have the preamp being tested which I purchased after reading very positive opinions on its sound especially in relation to its price After this video I'm really perplexed. How is it possible that measurements and listening differ so much? I am referring in particular to the high noise and distortion and the high output impedance which makes this preamp difficult to pair with solid state power amps I'm very puzzled Could you recommend a preamp that isn't too expensive but has better performance? thanks again and best regards gino

It's so beautiful.

I hope reply to this older upload. I received the exact kit ( more inexpensive version ). Unfortunately my power supply came with missing glass tube fuse. Could you check your unit for the specs of the fuse. I would be silly to return the kit to China for the missing 50cent worth glass fuse tube.

Thank you so much for the thoroughness and the opportunity for learning!!! ✌️🙌🙏

If you don't have a torx bit, sometimes a 1.4mm flat head ( actually that might be a 1mm) grips well enough to work, especially as the screws are not particularly tight.

Thanks so much for this video, what can i use in place of a contact cleaner?

Mi cabeza explotó al ver como lo abres, con tarjeta y todo... Lo haces ver fácil,lo intentaré y te estaré muy agradecida❤

Guess you had to deal with badlines and stable raster techinques to achieve that results..

Hey, if I use this device with external DAC/AMP for example Eversolo Z8 SPDIF Input from U7 SPDIF output, would I still be able to use all the VSS (Virtual Surround) options for Headphones? DD and such?

Hi, I have a Sony CDP-S41 which when plugged into mains power will not power up then after about 5min the display comes on and it works. I then replaced all caps inside and its still the same but the sound output is now sounding excellent. Can an IC cause this? thanks.

I picked up one of these recently, using it like a guitar pedal as a 2 stage tube booster/overdrive, running the left and right channel in series, any suggestions on how to increase the gain/and or distortion? Lower input voltage as mentioned in comments? (@alabamacajun7791) It has a great overdriven sound as is, just wondering about my options. Im familiar with electronics but fairly new to tubes.

Hi would it be possible to share name or link for that small vice that holds potentiometer, thank you I have similar one but looks smaller and without sunction sticking thank you.

My one worked good for a year charging small batteries, model train testing and general light use. Charging a 18650 lithium ion when " BANG " . One of the large capacitors blew its end off. Replaced capacitors but it only reads to 1.5v then falls away. I am purchasing another make of power supply for a replacement.

Is this significantly diff from like REW ?

I've used big/little endian terminology since the 70s, today, for the first time, I learned it's Lilliputian origins. Thank you !

Hi, I am curious, for how long time did it work? Is it long time fix or only for shprt period?

hey sir, What is the name of the tool you used to open the screws in the video?

Gracias!

I bought a brand new one myself (some years back) and it behave the same way from day one but didn't know at the time until it managed to burn 3 of my devices that I was powering (weeks apart from each other) and when I finally realized what was going on instead of fixing it, because I was so angry for the damages that has caused I decided that it's not worth the effort and dismantled it for spare parts (as it was fairly cheap to buy anyways) And by testing the relays I then realized that they were of a questionable quality (and so was everything else on it) and threw them in the bin. So, what I ended up doing was building my own DIY Linear Bench power supply with a couple of LM723C's and some Power pass elements (2 -30V @ 0-3Amps) and re-used the enclosure some buttons and the transformer. After building it, (which didn't take long) it worked first time nicely and still works today ! No regrets here ! But...If I'd known it was of a low quality construction I wouldn't have purchased it in the first place . :))

i have this spindle motor 4 years :D

Hello, can you use this as a headphone amplifier? I currently have hd560s (which by many sound very good with tube amps), a k361 which is rarely being used and an apple dongle, only point in getting this would be trying tubes on the 560s, otherwise might get the 47 classic

20:30, can I please ask why it makes that "uh uh uh" sound? I bought this exact spindle myself and I don't know if it's the spindle or the rest of the cnc mill or the bit... because slowing down the feed doesn't help, the only thing that helps is reducing pass depth, which doesn't make sense to me...

I know the ka7es is physical divided in 3 inside, power section, mechanical section and audio section and the walls are copper

thanks from brazil

Did you try a Monte carlo simulation with all the tolerances(+- 10 or 20%)? I think in most cases you can neglect the impact from the replacement of C5 and C6. You can finetune R5 and R7 with a Potentiometer, that would make a bigger and more controllable Impact.

Sir where you purchase all items? Also the total cost for entire project? Gr8 👍 video!

What a pity you stopped posting tutorials mate !!

Where did you get the battery cells (brand)?

My S8 began to do it after a bough a s23... looks like it knows that will be replaced and activate the death mode lol

Dude, it works like new now. Thank you.

What a great fix, 👏👏👏

Thank you! I was able to clean the my father mouse.

Thank you! For someone who most of the time uses headphones , which would you suggest?

I just built up this kit using your upgrades. Works ok, but not much change to the sound of my capacitor coupled amp. Looking forward to trying it with other amps that have direct outputs. Also changed R1 from 2.2 ohms to a 3 watt 3.9 ohm. This lowered to the heater voltage to 12.6 and dropped the resistor temperature from 150f to a more acceptable 115f. Added a 220uF cap to the heater circuit and this lowered the ripple to 1.0vac from 2.25. Thanks for posting your upgrades & measurements, these seem to be the best ones I could find for the 6j1. Update: Increased heater cap to 3300uF. Ripple voltage dropped to .24vac. Also added 470uF caps to R5/9. This lowered the 60cycle hum substantially.

Hi I just wanted to thank you for creating this amazing software! I surly appreciate the effort made to make it. I am using it with the ADP3450 Please keep up the good work 👏👏👏🙏

what type of engraving tools to make pcb?, what degree? (15, 30, or 60°?) And what type for making masking text?

That rise in frequency is part of the charm of this cart. What you gain reducing the hump you lose in something else. It’s a $250 cart. Either get over it or buy something else.

I just got the game console but I can't even go to the app LibreELEC BECAUSE FOR SOME REASON THE SITE WON'T LET ME is there a way where I can get to the app because I really want to play the old school games

Yes it will limit the noises because of decreasing dv/dt That means the mosfets switch slower(fall time and rise time increased) So the mosfets will be get hot and ...dead

Thanks for the test data. I have a formal background in engineering, got through all the fundamentals in the tube family in school, but bought the kit to finally have some first hand experience before getting into designing my own from the ground up. *The 2nd transistor in that particular architecture is for voltage regulation BTW.* It's used in solid-state schemes as well. It's collector is tied into the base of TR1 so it shifts it's input base bias current with the constantly changing input signal swing.