1968 Harmony 525 Preamp Mod

buildafriend

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Jun 30, 2009
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Omnipresent NYC
Hi,

I want to add a second preamp to said amp. I can't find the schematic though, does anyone here have it or know where I should look? 

All the best,
- JP
 

Wildfara

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Oct 2, 2015
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81
I have a 545...a 2x10 combo amp..solid state. The schematic is pasted inside...I don't know how similar they are though.
 

Whoops

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May 9, 2008
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5,209
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Portugal
in the event you don't find the schematic, look for other amps that might have a different name tag but with the same circuit.

The circuit should be simple so if you take the schematic of the Harmony model 420 and  Supro Thunderbolt and refer to that, you can probably easily trace yourself the schematic for the 525
 

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