Video

Thanks very much for this series. Very interesting and well explained. I've just bought a TS830 and also have a TS530, so of particular interest to me.

Yup, you need to adjust the pre-selecter to the band you want, you'll get no audio out until you do this. This caught me. I just got one of these, and re-capped it. 73

Great video, lots of good info, especially the VFO servicing. My 901DM is 46 years old now, June '78 build and the VFO is getting a bit lumpy. Also got issues tuning up on 40. Loading control won't peak. Just keeps rising all the way to position 10 on the scale. l hope yours is now working 100%. Thanks for posting. 73 de Keith

I bought one FT 910D back in January. Seems the Attenuator Switch is pretty much broken. If it is half depressed I have a good reception, in any other position I have nearly no reception. And the S-Meter doesn't display how much output I have. I will trace all the cables and see if I can get the 901 back to service. On the good side: VFO is stable and not drifting, dial is smooth output is around 80Watts, but without a proper readout I won't try more. Any tipps are higly appreciated.

These Ft-901s were the top of the line radio in their day. I’ve been running one as my backup rig for a few months. Killer receiver and rejection filtering.

Great to see the vintage units I longed for in the late eighties early nighties. Hope to see part 2. Regards steve

Gotcha! 🙂

I bought one at a good price. I am thinking of using banana plugs so I can use different cables, however, I see on lines are grounded. Not sure how that will work out. I might test before committing.

Nice video. Learned something. I was wondering if the M (memory) enabled might something to do with digital display. Looking forward to the follow up. Fernando N2FQ/6

I really enjoyed this one , especially seeing the VFO. And 720p is back! Thanks.

my qyt-KT8900 microphone works perfectly

Why the low res?

How did the battery pack work out? (You are braver than me.I would be afraid of burning my place down.)

great work!

Must be nice to be wealthy.

interesting

Great video ! Thanks for the effort and looking forward to more of the same.

I posted a long comment with a lot of helpful tips. I did not include any links. Even still, YT deleted it. IIRC, you can list me as some sort of a preferred commenter and I can post it. If you care to do that.

It looks like next to adjustment R741 up by your high voltage oscillator, it’s stamped “1675v ADJ” which would imply that the 1665ish volts you were measuring were actually very close to correct. It’s odd that the schematic calls for over 2300 or so.

When I was a little kid in 1962 the next door neighbor was listen to all of that stuff and amazed us kids when we used to go over and watch him work on that stuff

Not surprised that it had so many issues given its age and apparent condition. Thanks for the troubleshooting tour.

Yes, drill it out.

Freudian slip. 😅

You R the "RF Whisperer" Just saying. Thank you for the detailed walk-through. Cheers from So.Ca.USA 3rd House On the Left. p.s. I noticed I'm subscriber 666 and I have to be honest, should I be worried? Ah... I'll risk it

Thanks 👍

Promo>SM 🏃

Lovely old radio.

Hi, It would be great if you could make a video showing how to align the receiver. I don't have a lot of test equipment but would like to see how it is done. Thanks

I enjoy your videos but wonder why the video resolution is just 360. Is this the limit of the camera or a bandwidth issue? Thanks!

Coolio; listening on my Allied 395 receiver. *THumbsup*

just picked one of those up at a hamfest 40 dollars nice little repeater at that price

Thanks for sharing your knowledge with us.

I so enjoy your trouble shooting skills and showing us what you''re doing. Thanks so much!!!!

Suggestion... I do not have solder tweezers, but you might try using them to hold a piece of solder wick to mop up solder. Might be better than fumbling with holding everything by hand and getting burnt fingers, which I do. If you try that, please let me know the results.

No shame in using a TH cap, for the tight SMD.

Interesting add-ons for working with the 18650's. Would be nice if you included sourcing links and exact descriptions of the purchased items used during the video. Regards

that awsome , im lookiung for an older radios like that . thats what i grow up on. im so tired if my IC-7610 . i want an old Radio again . thank you for you video sir 73's

I put in a comment with a link to the radiohistory site with the poptronics PDF / schematic but it appears the comment has been deleted or hidden. So search for worldradiohistory Popular-Electronics-Guide and you can get a pdf of the original ESR article and the updated schematic

That's as good as my "Cantenna" dummy load for RF 👍 I've got like an old 900 watt Peavey amp that needs some work and this would be a good load for it.

That guy sucking on the lollipop looks like he just came from the Blue Oyster

I wonder why is there two branches of dividers R9,R10 and R11,R12 and a (pseudo) differential amplifier? Why not just one branch and a non-inverting amplifier? (I know that the direction on the ammeter would be different.)

What was the error in the schematic if you were showing it?

Can anyone tell me where i can find the components template used in rhis schematic ? I mean the graphics representing the electronic components. What is the name of this style of schematic.

Great video. Thanks for sharing it.

The diodes D1 and D2 can be considered fly-back diodes, or clamping diodes. If the capacitor is charged, it will force current flow back through the capacitor, rather than applying it to the differential amplifier.

That schematic also looks like it came from Silicon Chip Australia.

"Across", there's no such word as "acrost". Subbed though 😀The TL081 is a single opamp, you most definitely mean the TL084, or TL074 which are quads. No idea what an "asamal multivibrator" is, I think you mean "os-stable", astable.

I have seen many of these spilt power supplies from guitar pedals, but this one is weird. the output of the opamp is connected to GND ... also the switch from the 9 volt batteries is connected to 4.5V. So you set GND for the whole circuit at 4.5V, but where is actual ground or -4.5V?

many years ago when I was a Tech we used to replace all suspicious caps up front, particularly the well known dodgy ones ( Low value and tantalum). This was quicker and cheaper than testing each one individually and possibly having something intermittent and marginal slip by.

Love it! New viewer and subscriber looking forward to watching ALL your videos! Please consider showing all your work in the future. Instead of showing; “here are the capacitors I replaced”, instead, ACTUALLY SHOW the replacement process. Yes, it means longer videos, but beginners would like to see it and learn, and others can fast forward through, and while longer, it would actually mean less editing on your part. Beginners need the education, almost no one is showing their work anymore, and soldering and troubleshooting are dying ART FORMS that need to be preserved for future generations. These are skills that will be LOST soon if we don’t do something about it. Thanks!