• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Please check my work :)

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athos56

athos56

Member
Joined 2006
I'm tinkering with PSUD II to make a supply for a 300b amp and I was wondering if you would check my work. Here is both the schematic and PSU. A few notes, I entered in as much of the transformer info as I could and PSUD bumped up the voltage from 400v to 420v, I'm not sure if I should leave it there or not. Second I tried to determine the load (in ma) as close as possible and came up with 176ma for 2 300b's, 2 12ax7's, and 2 12au7's. As it is the sim comes out close to the 450 and everything looks smooth.

Thanks!
 

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athos56

athos56

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Joined 2006
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I'm going to use tentlabs heater supplies for the 12ax7/12au7's and filament supplies from www.diyhifisupply.com for the 300b's. I plan on going with the One-electron opt's. The rest of the PSU is a Hammond 178CX (400v/465ma) a 167M5 (5v/3a) and 2 167N6's (6.3v/4a). The caps are F&T caps, 1 30uf/500v and a 100uf+100uf/500v cap. The choke is a Hammond 193N. The resistor is a highwattage wirewound 10ohm/50w bolt on. 50w is overkill but it was the only 10ohm bolt on in stock at Digikey.
Thanks for any comments
 
athos56

athos56

Member
Joined 2006
Thanks!

Yeah, they may go out the door as a cost savings measure :). Hopefully it will be up and running soon, I'm going to start buying parts. I'm thinking about using some nice wood for the chassis, I'll mount the inputs/outputs/plug and such on copper plates in front and back. The tubes are going to be mounted through the top on those tag board/socket combos. Hopefully that won't be a fire hazard :). Maybe I'll make the top out of wood that smells nice when heated, hehehe. I'm not going to get the Aikido boards, opting for point to point.

BTW, if I choose to go with the standard metal top, what thickness do I need if I went with copper?

BTW x2... If I use the filament supply for the 300b I plan on omiting the two 47ohm resistors in the schematic, that would be the only change.
 
wakibaki

wakibaki

Banned
Joined 2008
It depends on how you intend to use it, but raw doublesided FR4 PCB is quite a good constructional material. If you can't see the edges, you can't tell it's not solid copper, and neither can most electronics if you're not using it as heatsink. It's fairly light and strong.

w

I guess singlesided too...
 
athos56

athos56

Member
Joined 2006
wakibaki said:
It depends on how you intend to use it, but raw doublesided FR4 PCB is quite a good constructional material. If you can't see the edges, you can't tell it's not solid copper, and neither can most electronics if you're not using it as heatsink. It's fairly light and strong.

w

I guess singlesided too...
Click to expand...

Hey thats a cheap option. I was thinking I would either route out a space in a wood front and mount the plate in the back or use the plate as the entire front. If I do the former the PCB would work great. Thanks for the suggestion its going on the spreadsheet.
 
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