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Vintage threads from the first ten years

A "good" place for the tranny

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10/18/2000 10:01 PM
Danny Bush	A "good" place for the tranny When you are ready to put the DC supply into the amp for the triodes 1. should you power all of them or just certain ones? 2. should I stay with 6.3 volts or switch to 12? 3.Where is a "good" place to put the transformer so it doesn't create a problem? The amplifier is a Fender Pro Reverb model AA165. Any input would be greatly appreciated.

10/18/2000 11:04 PM

I've heard that a good place to mount the extra transformer is on the capacitor cover. You need to see what kind of clearence you have with the speaker magnet. I don't think you want them too close. I've done 6 volts DC to all the preamp tubes and driver with good results. then use the old AC filiment supply for the power tubes where there's hum canceling already. Also it lightens the load of both transformers. converting 6 volts ac to rectified DC will cause a voltage increase. mabe some one will chime in on that discussion

Tracy

10/19/2000 5:46 AM

quote:
"I've heard that a good place to mount the extra transformer is on the capacitor cover"

Let me guess... you've been reading/or dealing with Dan Torres again? please dont do that...not only do you risk shorting out the caps if yoru screws are too long, generally it's not a stable mounting, and it just makes another nightmare when you go in to change the caps.

10/20/2000 4:31 AM

OK
Mabe I read that Dan Torres book. You guys dump too much crap on that Guy. I know It's written like 1st
Grade but I was there once. I guess we know he is an electrical Engineer. So whats so vintage about a cap cover. you could buy a new one for five bucks at smart parts and drill holes in it. by the way there's caps under there. what do you mean you can't get that hand drill inside the amp?
So the Guy wants to run a little DC on the preamp tubes. lets discourage him some more

10/20/2000 1:43 PM
Rebel420	it's not about the vintage bvalue of that cap cover.... I agree you could get a new replacement to hack up, it' about common sense. If you short out a filter cap, say bye bye to that vintage gz34 rectifier (commanding more anthan $50 these days each!), + say byebye to that power transformer ($100+), it's just not safe

10/20/2000 3:36 PM

tracy, take a chill and reread rebels first post.
yes he did slam torres a little but so does every one. there is nuthing in his post about not hacking vintage stuff. he's not discourageing him from running a little DC.
he simple stated, a simple and good reason not to place it on the cap cover. like possiblity of shorting of the caps, or not a stable platform to mount on, or makes it a hassle when you need to change the caps later.

Rebel was giveing good helpful advice and things to think about to make the mod work and be realiable. no where in his post did it say not to do it.

Bryan

10/20/2000 7:42 PM

sorry

Some of that response was to Bruces comment about the vintage cap cover. I guess I just expect common sense about drilling holes in unknown territory.
Good point though. When I was fifteen I was building a soapbox derby car with a guy. He drilled a hole from the inside right into his stomach.
Daaa>>h As for Torres he deserves a little slamin for dreamin up hack mods sales for vintage Fender Amps!

Tracy

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