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Old 27th January 2013, 10:06 PM   #1
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Default Monster Hammond Output XFMRs

I just picked up a pair of fairly massive output transformers from some Hammond instrument. The number on the transformer is A0-30072-1. From my preliminary searches these may have been used in a bass cabinet of some sort. Does anyone have an associated schematic?
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Old 27th January 2013, 10:16 PM   #2
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Hmmm. just answered my own question. These things came out of a Hammond E-100 organ and drove two speakers with a tapped secondary, with a HF crossover cap in series with one output. I nabbed a copy of the schematic. The amp used a pair if 7591As - I might settle for 6P3S-Es instead.
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Old 28th January 2013, 07:08 PM   #3
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It's actually quite a bit more powerfull.
It also ran the Reverberation PP-Amp.
Take a closer look at the schematics.


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Old 28th January 2013, 07:31 PM   #4
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Not too sure about that, as there are 3 output leads on the transformers in question, and the reverb amp shows 2 output leads on the transformer. I'll take more time to figure them out when I actually have a project for them. I'll also check my home copy of the schematic, as it has more resolution.

Edit - I see what you're talking about, now, as what looked murky in the small schematic was a crossover for another speaker output. Having said that, the amp only uses 7591As. I figure the extra transformer mass must be for bass extension.

Last edited by wrenchone; 28th January 2013 at 07:38 PM.
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