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Old 16th February 2011, 11:00 PM   #1
slhijb is offline slhijb  United States
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Default Extending Tube Sockets off a PCB

Has anyone tried extending the tube sockets off a preamp pcb with wire connections, say about 4 to another fixed location inside the chassis? 9-pin 12AU7 bottom mount sockets would be used.
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Old 16th February 2011, 11:17 PM   #2
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by slhijb View Post
Has anyone tried extending the tube sockets off a preamp pcb with wire connections, say about 4 to another fixed location inside the chassis? 9-pin 12AU7 bottom mount sockets would be used.
I did this in my power amp, but the extension was less than about an inch. 4" sounds too long to me for a preamp.

I used bus wire and soldered them to the socket first, then pushed it into the PC board.

My reason was to keep the filaments off the PCB, so I only brought up the six signal pins.
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Old 16th February 2011, 11:27 PM   #3
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There's several ways to do this if you search a bit.

Important things to remember is that stopper resistors need to be close to the tube to do their thing; that has to be designed into your final system.

Also, if the reason you are doing this is just to mount the tube sockets flush against a top plate without other components getting in the way, the better way is to assemble the PCB so that bulky components are mounted on the underside of the PCB. Obviously, if you go this route you need to pay attention to polarity and not just stuff the PCB blindly according to original instructions.
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Old 17th February 2011, 12:29 AM   #4
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Leadbelly said it:
You'd have to give it some thought/analysis- things like grid stopper s need to be close to the pin, so might have to be moved as well.

If it's not a very complicated circuit, it might be easier to do the preamp point-to-point. Is the PSU on the PCB?
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