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Old 18th May 2004, 11:53 AM   #1
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Default Information needed

I recently received a Hammond Reverberation amplifier and I am seeking information and a schematic for it. It has (2) 12AX7's (2) 6BQ5's and (1) 5y3 for tubes. I have done searches for the correct schematic and haven't found anything. It seems to pass a 1K sine wave into an 8 ohm load and get a whooping 3.72 volts out. I would have expected more.
Any help would be appreciated. It would be nice to find a second one just for kicks.

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Old 19th May 2004, 12:34 AM   #2
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Location: Chicago
Try this page:

or this newsgroup

IIRC, the reverb channel only went down to 1KHz or something
like that (you really can't hear reverb from a spring reverb
tank below a certain frequency) then went out through
a horn speaker. So the amp may not have much
response on the bottom end.

Useless trivia: Laurens Hammond invented and patented
the spring reverb.
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Old 19th May 2004, 10:58 AM   #3
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Unfortunately the links don't have information on the unit I have. I do appreciate the help.

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Old 19th May 2004, 05:36 PM   #4
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Try posting on, or
any discussion forums you can find regarding

I know some of the geezers who hang out at AMHO
have pretty close to an encyclopaedic memory of everything
Hammond ever made or did, some of them actually hung out
with the man himself. I'm sure one of them will remember
this unit and probably have a schematic as well.
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Old 21st May 2004, 08:40 AM   #5
G is offline G  United States
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Location: Belleville, IL.
Try this link. If he doesn't have it he knows who does. You will have to pay a nominal fee for a copy of the schematic. He finds, archives and sells schematics for a living.
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Old 21st May 2004, 11:14 AM   #6
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Thanks for the reply. After playing with it for several nights I have decided to scrap it and redo it to be a 12B4 amp with a 12B4 front end.
This would be something different and would give me roughly a 1.5 watt amp.

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