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First Power Supply
First Power Supply
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Old 27th August 2010, 08:29 PM   #1
Doogie is offline Doogie  Canada
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Default First Power Supply


I'm getting ready to scratch build my first SE 1 watt tube guitar amp using what I have on hand:
1 6CA5 beam power.
2 6hb6 pentodes for gain.
1 All American 5 radio output tranny.

This project is just for learning about tweaking and working up to building on my own without following a schematic. I'm pretty good with circuits under 5VDC but this is my first tube amp.

I am methodical... so, first things first. I put together this 100VDC power supply from several schematics found the web. Please excuse the crappy schematic.

I choose 100vdc because I have the Resistance Coupled Amp Charts for both tubes at 100vdc (one day I Will understand what you people are talking about) and at this lower voltage there seems to be a closer match to the output transfomer. Figured it would be a good place to start with the knowledge I have and the desire to figure this out without being too dependent on you folks time/knowledge.

Thought I should get some advise on the power supply before I go ahead with some bread boarding.

Nothing gets hot even when I load down both transformers and I keep one hand in my pocket while working on it.

Does anyone see a problem with this functioning? (other than the fact that it won't sound that great, I could just buy the proper tranny and use better tubes of course.LOL)

Thanks in advance.
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Old 27th August 2010, 08:59 PM   #2
tatchoune is offline tatchoune  Belgium
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Location: Far from the sea
There is a very big problem, the transformer on the right of the picture is wired in the opposite way it must do.
You must connect the secondary (8 v) of the first transformer to the 9 v of the second (I imagine you want to use the schema to isolate the final 112 volts from the mains).
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Old 27th August 2010, 09:04 PM   #3
Doogie is offline Doogie  Canada
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Join Date: Aug 2010
Default Correction


I have it wired up the correct way... mis-labled it on the schematic. Sorry if I alarmed you.
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