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7868 to 7591a conversion help
7868 to 7591a conversion help
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Old 13th July 2014, 11:36 AM   #1
vrusso123 is offline vrusso123  United States
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Default 7868 to 7591a conversion help

Hi all, I have looked in the search (I can never find anything), and posted this question in this thread Twin Conn Organ 7868 Rebuild, but no one seems to even read it. It is boring.

anyhow, I have two Conn 2 channel amps that I want to change the output iron on (transformers are not full range). they both have all the caps changed and are running good. one is in my stereo system now and will not be changed until I have finished this one. it has a new set of sylvania 7868's, and sounds awesome (except the rolled off highs).

The second is in the process of being rebuilt. the tubes are pretty burnt up and I have a new set of EH 7591a's that I would like to use instead. I bought some huge Eico iron, and to make them fit I will have to change the layout. I like the looks of the 7591a's and If I have to move the sockets, I want to use them. I have 8 pin sockets that are no longer used on this amp, and can put them where I want them, then move the wires over which should make this not so hard to do.

can anyone please draw me a diagram of the pin to pin conversion? I really need your help.
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Old 13th July 2014, 03:06 PM   #2
Palustris is offline Palustris  United States
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Join Date: Aug 2006
Location: Cape Cod
You can look up the data sheet for almost any tube here: Electron Tube Data sheets Print out the two pages with the socket connections and draw out the changes on a piece of paper. It will be much more rewarding to figure this out for yourself than to just have someone give you the answer.
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Old 13th July 2014, 03:29 PM   #3
kevinkr is offline kevinkr  United States
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7868 to 7591a conversion help

Post your changes here..
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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