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Hoffman Amps Forum image Author Topic: LOWATT DR103 clone power section  (Read 1969 times)

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Offline idsnowdog

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LOWATT DR103 clone power section
« on: April 02, 2024, 06:50:43 pm »
I have built a preamp board for a HIWATT DR103 project using this layout https://hiwatt.org/Layouts/Tag2.gif .  I do not need the 50/100 watts of a DR504/DR103 and would like to build a power section under 10 watts.  I realize that 10 watts won’t give me the same ungodly loud clean headroom that HIWATT amplifiers are known for.  But I'm not after cleans.

I scrapped a Hammond S6 organ and my input transformers are AO-26361/A0-26706 and output AO-26656-0.  The organ had two 6V6 output tubes and I would like to use two 6P14P/EL84 or two 6AQ5 output tubes.  I realize the transformers I am using aren't ultralinear or measure up to Partridge specs.  So what power section would be a reasonable alternative?  The Hoffman stout?
« Last Edit: April 02, 2024, 07:19:29 pm by idsnowdog »

Offline idsnowdog

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Re: LOWATT DR103 clone power section
« Reply #1 on: April 03, 2024, 03:18:33 pm »
I found a schematic and layout for the Trinity Triwatt and that looks like a good candidate.  I would just need to rewire it to use 6AQ5 tubes instead.  I could also use 6V6 tubes but I want to use something cheaper instead.

This is what the KT66 or 6V6 switch section looks like.  If I wanted to eliminate the KT66 switch option how would I wire it? 
« Last Edit: April 03, 2024, 03:27:39 pm by idsnowdog »

Offline sluckey

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Re: LOWATT DR103 clone power section
« Reply #2 on: April 03, 2024, 03:32:55 pm »
This is what the KT66 or 6V6 switch section looks like.  If I wanted to eliminate the KT66 switch option how would I wire it?
You could start by posting a full schematic and layout.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline idsnowdog

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Re: LOWATT DR103 clone power section
« Reply #3 on: April 03, 2024, 03:45:42 pm »
These are the Triwatt

Offline idsnowdog

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Re: LOWATT DR103 clone power section
« Reply #4 on: April 04, 2024, 07:49:51 am »
I found this in the builders guide.  It wasn't labeled but it shows the wiring without the power tube switch. 

 


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