How to repair Fender Champ tube guitar amp Intermittent audio D-lab 

I have been watching Terry for a long while. Yes the VTVM, oscilloscope, are very useful. But the man behind them is more important. Thank you very much Terry for being a very good teacher.

Preaching to the choir here.... Those warping old Fender circuit boards are great for repairs caused by the boards itself. You can see the warping in the area of the cap failure. Excellent video about old analog meters. Definitely easier and safer than setting up a big oscilloscope, variable iso transformer, audio generator, etc..... Heck of a lot cheaper! Thank you for the video!

You have old school vacuum tube theory for sure that's priceless. thanks

I like your impresario, "Mr. Dual Triode Guy"! He's a class act.

Your whole point here is of great value! I wouldn't be without my VTVM's in the shop. Great for peaking IF stages on an old AA5 as well as being able to take voltage measurements without loading down the circuit under test since tubes are hiZ devices, and the VTVM is the perfect marriage. DVM's, like digital oscilloscopes, are constantly refreshing and can drive you to drink...(not a bad idea during a rough day) :) CRT scopes will always reside at my shop :). One of my favorite VTVM's is the RCA WV98C which I lost on a service call...it grew legs. Wish I could locate another one...even if I have to restore it. This was a great tip for the newbies, and a reminder for us veterans :) Keep 'em coming...I'm a watchin' :)

Hey Mr. D-lab, good on you for acquiring a VTVM! There is another way in which these beasties can be used, look at the very bottom scale - the little minus-zero-plus bit. To use this, use the zero control to make the meter read the centre of this scale & it will show not only positive readings but negative readings also. Comes in very handy when aligning IF transformers. Also these meters have an input impedance comparable to that of a digital meter. Thank you for another bloody good video. I salute you good sir.

Did you call it? Terry, you ALWAYS call it! Your knowledge of vacuum tube/valve circuitry, component behavior and aging never fails to astonish me! Again, NAILED IT!

Nice repair Terry and I figured that you would find it pretty quick. I collect old VTVM's. I've got Eico's (259 on the bench right now), a giant old Hickok Model 209, a couple of RCA Voltohmyst's and one Senior Voltohmyst, and my never been used Simpson Model 303. You can't beat the old analog vacuum tube meters. 73 NE5U

Thanks for all you do, lot's of effort on your part Mr. D.

Hi Terry, watching your videos regularly - everything looks simple and easy - thanks for sharing your unconventional way of fixing amps.

Foi bem explicado em seu vídeo. Os medidores analógicos ainda são parte fundamental em toda bancada de reparação e montagem de eletrônicos. Excelente vídeo...!!!!

Excellent! Still catching up on the d-lab videos. Yes, for certain applications you can’t beat a VTVM!

Very nice work indeed ,yes very good d-lab keep up the great work .I can't wait to see what assignment you get next.

Nice. I got two of those Heathkit VTVMs last ham swap meet for $5 each; I didn't really need them, but they had been repaired and I really couldn't resist. Gotta make probes; those are not quite so trivial with that special TRS phone plug with the insulating bushing in the middle. Otherwise, any old phone plug will work as long as you lay off measuring big volts. I may just hard-wire in some leads.

Cool deal.. I have a few analog budget meters around. It would work for this sort of thing. The school always said it had to be Simpson or Triplett, or it was a joke... I don't believe them. I started with some "poor man" meters, and they earned their keep til I could upgrade.

I already have an Eico 221 and recently acquired an RCA Master Voltohmyst WV-87A and a Master Voltohmyst WV-510A.....Nice :-)

There are analog multimeters still available to buy in our equivalents to dollar stores here in Brazil. haven't checked prices recently, but last time I saw 'em, they went for something between 1 and 2 bucks.

"Hit it on the top". Known as percussive maintenance.

I've got an old analog meter I bought new from radio shack years ago that has been accurate on all its settings. It's been a really good meter. But a VTM would be nice to have too.

Outstanding! Thanks! Reading the comments, I found the VTVM 5 vac setting reply. What signal generator settings did you use? And, if I may, I have always wondered: why can't one use an 8 ohm speaker core as a dummy load? So much obliged for the great tutorials

hello and I've got to say I love your videos and all the great information you put out there for everyone so that being said I have a question about capacitors , I am in the process of ordering a assortment of capacitors so my question is how critical is the voltage. I noticed a lot of the assortment of capacitor kit range around 50 volts so that being said I would think that if I'm going to be working on tube amps and Tube radios I would need at least a voltage of 2 - 300 volts to put me in the good range is this true? Any information you can give me on this would be much appreciated thanks and keep up the good work.

Very Good!!

This is a great tip about the VTVM Terry. I happen to have an old Heathkit one and will have to give this method a try. Gotta say though, that IP-32 in the background is a beauty! Still got that?

Nice vid! What type of glue do you use? Looks like duco. Would silicone be strong enough to hold it? I wouldn’t want anything that would be hard to remove later.

You called it fur shur. And without a glass of vino beforehand. Lol

Hi Terry, I really enjoy your videos and the knowledge your share. Out of curiosity, what model Heathkit VTVM do you use? Thanks, Lee

thanks for your video very helpful ! i have a question about the 8 ohms dummy load resistor should we only use a non inductive resistor, instead of a regular one ? is it risky to do so ? or it is just for precision ? i tried with a regular one and it works just fine. thanks you.

Very nice job, what do you set it on like AC 10 volt range..

Question: would a 100 ohm resistor be too small to discharge the filter caps capable of holding up to 500V?

Terry,,, gotta say that it is really hard to watch with the audio out of sync that much. Great vid if not for that friend. Carl

tweak that amp wit da v t v m boy! oh yaaaaah

D labs da shit

"I'm too old for a sandwich in the late afternoon"