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-   -   Marshall 18W clone (sort of) (http://www.diyaudio.com/forums/tubes-valves/142859-marshall-18w-clone-sort.html)

AmpKiller66 24th April 2009 03:19 AM

Marshall 18W clone (sort of)
 
Hello, I have the power and output transformers from an old organ that used 4 EL84s in the power section, along with numerous 12AX7s. I was wondering if it would be possible to make a clone of a Marshall 18W with these transformers, except with 4 EL84s instead of 2 in order to compensate for the impedance mismatch (and to bump up the output power). The voltages from the power transformer are roughly what you'd get from a Marshalll power transformer, but would the existing preamp circuitry and phase inverter be able to drive the additional EL84 per side?

AmpKiller66 24th April 2009 03:27 AM

Here's a link to the schematic: Marshall 18W

leadbelly 24th April 2009 03:27 AM

Build this: https://taweber.powweb.com/store/6m36tmbc_schem.jpg

AmpKiller66 24th April 2009 03:30 AM

Thanks! I'll look into it, and I'll probably try both, but for the sake of the original question, could you drive 4 EL84s with the preamp of a Marshall 18W?

leadbelly 24th April 2009 03:35 AM

The circuit I linked is essentially the 18W circuit with 4 EL84's:

https://taweber.powweb.com/store/kits_60b.htm#6M36

AmpKiller66 24th April 2009 03:38 AM

That it is:) It's been a long day...

mashaffer 24th April 2009 10:28 PM

18watt.com has an entire section on 36watters. Very helpful guys there that were in invaluable in helping me build an 18watt variation for my grandson.

AmpKiller66 25th April 2009 12:01 AM

I just registered at 18watt.com. thanks for the advice.

mashaffer 25th April 2009 12:44 AM

No charge. ;)


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