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RE: Hammond preamp

Would you care to elaborate on the circuit's ingenuity?

In the first version of this family of preamps, the output triode's cathode is relatively fully bypassed, but in the second version, they went to a 1uF bypass and stayed with that through all the remaining versions. I'm not entirely sure why they did this for an organ with tones down to 33Hz, but the organ did have a mechanical tremulant that might have created some LF pulsing. I also imagine that the 12" speakers used in Hammond tone cabinets of the era might not have handled the low pedal tones that well. But since anyone directly involved is no longer around, all we can do is infer. We do know that Hammond was aware of ways of fooling listeners into thinking they were hearing LF pedal tones that Hammond's tone cabinets couldn't quite reproduce.


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  • RE: Hammond preamp - Thermionic27609 19:27:12 04/21/15 (1)

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