Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Stuff4bikes on November 07, 2021, 03:17:20 pm
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I picked this up last night, it's a Baldwin panoramic tone cabinet....
Cant find a schematic for it but looks like it has 3 seperate reverb units
With 2 12ax7's and a gain per spring.
8-12ax7's
2-EL84's
5U4
In total.....
Anyone familiar with this?
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It's called a necklace reverb. If I had that unit I would try to fix it as is. The electronics chassis is nothing special but the entire unit probably is.
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i have a schematic for the single "delay line" unit that was inside an organ if it would be helpful in diagnosing the reverb part. you may be able to find a schematic/service manual for the whole unit if your googlefu is good enough
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It's called a necklace reverb. If I had that unit I would try to fix it as is. The electronics chassis is nothing special but the entire unit probably is.
How can I play guitar through it with out destroying it? I can turn the unit on and tap the cabinet and hear the springs through the speaker, not sure if that means anything.
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It's called a necklace reverb. If I had that unit I would try to fix it as is. The electronics chassis is nothing special but the entire unit probably is.
How can I play guitar through it with out destroying it? I can turn the unit on and tap the cabinet and hear the springs through the speaker, not sure if that means anything.
You'll need a schematic to figure that out. If you post the model number of the unit maybe we can help find some more info. Maybe take a close-up pic of the data plates on the amp and the side of the cab.
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Picture
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these are not your exact model (i got them as a reference for a conversion of the amp and reverb unit a friend picked up to send to me), but they should be helpful (yanked them from photos in a reverb listing because the schematics seem harder to find than hammond organ schematics)
i'll do some more looking though
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Looks like mine may have a seperate pre amp module. Thanks for all your help so far....
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'Necklace' is the early Hammond. The Baldwin saggy-thing is quite different. It does not pass baseband audio; audio is modulated on a supersonic carrier, passed through spring, and demodulated back to baseband audio. You need both parts.
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'Necklace' is the early Hammond. The Baldwin saggy-thing is quite different. It does not pass baseband audio; audio is modulated on a supersonic carrier, passed through spring, and demodulated back to baseband audio. You need both parts.
I will probably put it away for a long term project then.
{edit- quote tag fixed -PRR}
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audio is modulated on a supersonic carrier,
Thanks, I was almost loosing sleep over the amount to tuners in that thing!