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Old 2nd October 2005, 06:41 PM   #1
rdf is offline rdf  Canada
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Default Ping amperex re: Hammond organs

Hi amperex,

In this post

http://www.diyaudio.com/forums/showt...750#post707750

you give instructions for modifying a Hammond organ chassis to make a triode 6V6 push pull. It piqued my interest but after hours of dizzying boredom sifting through Hammond schematics, tribute sites and Ebay I can't find a chassis that exactly matches your description. Most organ amps with a quad of 6V6s are biamp models with separate (and differently part numbered) bass and treble output transformers. The one or two found which are true full range didn't have a 6J5 front end, at least not on the same chassis.

Either the description doesn't match or I can't see how they're adaptable to full range use. Could I trouble you for a little more detail? Thx in advance.
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Old 3rd October 2005, 04:13 AM   #2
amperex is offline amperex  United States
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Here is a picture of my amps. The audio transformer is different as well as the tube line-up. I used 4x 7C5 (same as 6V6) plus a 6CG7 splitter/driver.
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Old 4th October 2005, 03:47 AM   #3
rdf is offline rdf  Canada
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Thanks amperex, now I have something to look for.
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Old 4th October 2005, 03:57 AM   #4
amperex is offline amperex  United States
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The choke in the stock amp are both the same size. I replaced one stock choke with a physically smaller choke next to the power transformer. I wanted a higher DCR as voltage was a little too high for 6V6 triode connected. The stock audio transformer sits in the chassis like the power transformer. All chassis of this type are black wrinkle paint. I find these amps on ebay.
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Old 4th October 2005, 07:07 AM   #5
rdf is offline rdf  Canada
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Thx again. You mean like this one?

http://cgi.ebay.ca/JENSEN-HAMMOND-TU...QQcmdZViewItem

Judging by the 'buy now' on this auction word may be out.
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Old 4th October 2005, 10:43 AM   #6
amperex is offline amperex  United States
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Yes, that is it. Only, I paid about $60-70 each. $300 is way out of line.
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Old 4th October 2005, 08:50 PM   #7
rdf is offline rdf  Canada
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You wouldn't happen to have a link to the schematics? If it's similar to the some other Hammonds I saw it looks like an interesting circuit to play with.
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Old 5th October 2005, 01:33 AM   #8
amperex is offline amperex  United States
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Default I never saw any schematics

I just look at the wiring on the tube sockets & associated parts. A schematic kind of forms in my head as I have many tube sockets & various circuits memorized.
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