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Hoffman Amps Forum image Author Topic: Powering seperate power amp and pre amps from 1 PT  (Read 1464 times)

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Offline Auke Jolman

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Powering seperate power amp and pre amps from 1 PT
« on: December 08, 2023, 01:00:28 pm »
Hello All,

I'm thinking of building a stand alone poweramp and add 2 or 3 different pre amps to it. All in different chassis stacked on top of each other. I've got a donor PT that has been used in een 100 W EL34 PA amp. It has 2x 6,3 windings. The first rated at 6A and the second at 2A. All in all enough to power everything I would say.

Is there a way that I can safely (and without adding noise) connect it all to that one PT?
With Regards,

Auke

Offline sluckey

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Re: Powering seperate power amp and pre amps from 1 PT
« Reply #1 on: December 08, 2023, 01:16:48 pm »
Sure. Lots of ways. Here's one example... I only had one preamp. To add others, just duplicate the umbilical cord and plug.

     http://sluckeyamps.com/vox/vox.htm
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Auke Jolman

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Re: Powering seperate power amp and pre amps from 1 PT
« Reply #2 on: December 08, 2023, 02:37:05 pm »
@ Steve: Thanks for pointing out the amp. I saw you used shielded wire for the HT and filament wiring. I guess that was not signal wire?

With Regards,

Auke

Offline sluckey

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Re: Powering seperate power amp and pre amps from 1 PT
« Reply #3 on: December 08, 2023, 02:47:19 pm »
@ Steve: Thanks for pointing out the amp. I saw you used shielded wire for the HT and filament wiring. I guess that was not signal wire?
That's right. The signal wire is also shielded with RG-216.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

 


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