Help! el34 8pin to 7pin conversion - diyAudio
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Old 10th March 2009, 11:07 AM   #1
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Default Help! el34 8pin to 7pin conversion

Hello all!

Can anyone point me towards some info on what is required to change my amp from using 8pin el34s to accepting 7pin el34s?

I am new to the whole tube thing (first amp) and dont know much, if you need any more info please let me know. I have already opened the amp up and pin6 (missing pin) is definitely wired in and doing something. I am excited to learn about tubes, and looking forward to doing this modification!
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Old 10th March 2009, 11:26 AM   #2
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Hi,

EL34 uses an octal socket, regardless if it has a pin missing. No need to rewire anything.

The ones with the 8th pin don't have it tied internally usually.

Cheers!
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Old 10th March 2009, 11:27 AM   #3
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Pin 6 on the EL34 is not used. That's how an EL34 is.

Some manufacturers use an unconnected pin on the tube socket as a convenient 'unused' soldering tag, to mount some other component (resistor, etc) or as a junction point. It doesn't mean that it is supposed to carry any current to or from the tube.
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