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Old 24th April 2009, 03:19 AM   #1
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Default 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?
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Old 24th April 2009, 03:27 AM   #2
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Here's a link to the schematic: Marshall 18W
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Old 24th April 2009, 03:27 AM   #3
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Build this: https://taweber.powweb.com/store/6m36tmbc_schem.jpg
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Old 24th April 2009, 03:30 AM   #4
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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?
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Old 24th April 2009, 03:35 AM   #5
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The circuit I linked is essentially the 18W circuit with 4 EL84's:

https://taweber.powweb.com/store/kits_60b.htm#6M36
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Old 24th April 2009, 03:38 AM   #6
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That it is It's been a long day...
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Old 24th April 2009, 10:28 PM   #7
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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.
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Old 25th April 2009, 12:01 AM   #8
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I just registered at 18watt.com. thanks for the advice.
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Old 25th April 2009, 12:44 AM   #9
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