Ping amperex re: Hammond organs

rdf · 2nd October 2005, 05:41 PM

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.

amperex · 3rd October 2005, 03:13 AM

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.

rdf · 4th October 2005, 02:47 AM

Thanks amperex, now I have something to look for.

amperex · 4th October 2005, 02:57 AM

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.

rdf · 4th October 2005, 06:07 AM

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.

amperex · 4th October 2005, 09:43 AM

Yes, that is it. Only, I paid about $60-70 each. $300 is way out of line.

rdf · 4th October 2005, 07:50 PM

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.

amperex · 5th October 2005, 12:33 AM

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.

2nd October 2005, 05:41 PM	#1
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	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.

5th October 2005, 12:33 AM	#8
amperex diyAudio Member Join Date: Feb 2005 Location: MI	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Anyone heard of Fisfar organs?	Test Electrix	Instruments and Amps	5	9th July 2009 07:07 PM
overdrive circuit for hammond organs(need help)	shwaggety	Tubes / Valves	0	15th August 2008 09:44 AM
Which Amperex ECC88 is the best?	ac2005	Tubes / Valves	1	7th September 2005 03:04 PM
Amperex 6DJ8	hifiZen	Tubes / Valves	8	10th July 2004 08:13 AM
IB gurus: Tempest vs. BPD 1503 for organs and explosions	VDoran	Subwoofers	2	8th January 2002 05:13 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

4th October 2005, 02:47 AM	#3
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Thanks amperex, now I have something to look for.

4th October 2005, 02:57 AM	#4
amperex diyAudio Member Join Date: Feb 2005 Location: MI	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.

4th October 2005, 06:07 AM	#5
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	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.

4th October 2005, 09:43 AM	#6
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Yes, that is it. Only, I paid about $60-70 each. $300 is way out of line.

4th October 2005, 07:50 PM	#7
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)