Tube Amp Archive

Part 2: OK, so I get the PT installed, (nice job if I do say so myself). Unfortunately there is still a trap for the novice!! I kept blowing fuses one after the other. No Power at all! :? I thought I had a ground issue or a bad tube at first. Then, I figured I'd better start doing some homework. .. ...

Thanks Phil,

Good to see I'm on the same page.

Excellent advice and much appreciated that you took the time to reply.

OK, all good.

+ White with black stripe is redundant.

+ Black is active (Violet on replacement MM PT)

+ White is Neutral (Black on replacement MM PT)


Correct me if you believe I am wrong.

Over and out

Hi, I have a question regarding the pending 110v to a Mercury Magnetics 240v PT conversion of my Lonestar Special. (actually two, but I'll get to the second one in a minute). I have successfully completed this procedure on two previous amps with no problems. I just want to check this one first. I ha...

Well done guys. You've proved extremely helpful.

Thanks again!!

...meaning it's a path to ground or not necessary?

Excuse my ignorance.

Thanks.

Thanks Andy, you've been most helpful.

So.. would that make B path to ground?

Cheers.

Hi amp guru's!, I need some straightforward advice regarding a circuit I've hopefully attached. I'm introducing a post overdrive tone circuit to my amp's overdrive signal. I have cut the pre master amps' PCB circuit path and need to confirm exactly where I introduce the input signal from my amp to t...

Thanks for the tip jaysg. Will try that.

Hi guys, I have an issue where I have a high pitched squealing occurring in the "more drive" channel as I increase the gain, treble or middle. (pretty much anywhere past half way) I have found that, with the back panel off, the squeal will disappear completley when I place my finger on the ribbon ca...

Hi again, Hot Rod Deville Mod. I have had a great deal of trouble sourcing .022uF, 330pF and 47pF caps. The best I can do in Australia is ceramic 50V rating. Q. is a 50V rating adequate for a post overdrive tone stack circuit? Thanks for any help. :?: EDIT: Jumped the Gun!... I found what I was look...

Structo: Hot Rod Deville 410

daveg: Thanks so much for clearing that up!

This Forum rocks!

Hi people, I am in the process of installing a post overdrive tone stack to my amp and a very experienced tech I am getting advice from advised that I should shield the grids of specific 12AX7A tubes if I get oscillation. Please explain how I do that, as his technical correspondence is a little more...