Heathkit V-6 VTVM Repair Part 2
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- เผยแพร่เมื่อ 22 มิ.ย. 2021
- In this video I go over what I found wrong with this Heathkit VTVM. I also show what I did to fix the issue. I then show it working properly. If you missed part one you can watch it here: • Heathkit V-6 VTVM Repa...
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#heathkit #VTVM #learnelectronics - วิทยาศาสตร์และเทคโนโลยี
Thanks Michael. Always good to look over someones shoulder on restoring one of these vintage VTVM's. I picked one up a few years back from a Hamfest for 3 bucks figuring the V-6 and a later model IM-18 with a broken movement might provide enough parts to get one of them working. Well, I've opened up the V-6 and there is very little wrong with it. I am justt now getting it going for a vintage tuner alignment that I want to do. I've gone through all the resistors and made a parts list. Planning on replacing two of the three caps and a hand full of the non-precision resistors. The movement works on mine and all the precision resistors look to be close to spec. I'm also planning on using the filament supply to build a 1.5V battery eliminator using a zener diode, resistor and cap. I had to order (correct type) new probe/leads from the guy on ebay. That should be arriving soon. A fun little project.
Just a note on the vintage of these. The manual I pulled off the internet has 1953 stamped on it and I've read in threads that the V-6 was sold from 1952 to 1954. I marvel that the appearance is still somewhat modern looking (although analog) considering that it is nearly 70 years old!
Thanks for your channel and this two-part series.
Hey Michael...keep up the good work! I am one of the guys that watches every video, all the way through. I also have seen signs of you on other channels Buddy's "The Radio Shop"). I think if you keep adding content, and make it fairly regularly (not easy, I know), you will gain a following that will snowball. Good luck...I'll be riding along!
Thanks for the kind words Tony!
Thanks for this video, man. I've got a Heath V-7 -- a kinda-rare model apparently, as it's 1956-only, according to Jeff Tranter's video covering the V-7. Anyway, it's acting a lot like this one was: reading fine on one scale and not so fine on others. So I suspected the resistors, though I haven't actually popped the cover to test them yet. A way to easily test those out without popping the cover is to just plug an ohmmeter straight into the input jack and flip through the range switch, and bingo, you're checking all the resistors (of course the switch might be dirty, which would give you a bad reading, but anything that's way off will show up).
Luckily I've got a fairly beat-up Heathkit IM-28 parts donor, and the resistors in that one are much newer, probably much better, and test spot-on, so I'll just rob Peter to pay Paul instead of having to whip up custom-value jobs.
Nice channel you've got here; I'll second what Tony Vasile says and encourage you to keep on keepin' on!
Thanks for the kind words. and the tip.
So how would i hook up my DMM to test the resistors in the vtvm? what lead goes where? I have an Heathkit V-6 that i want to restore.
Thank you
You need to reserve both ends of the scale SEVERAL times when reading ohms. And do it again when switching to a new range. You also have to have a fresh C cell in the meter.
Do the resistors with solid color have the value printed on them? anyone know?
Thank you