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Old 26th June 2008, 03:25 AM   #1
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Default Rewiring a socket to take 6GK6 instead of 6BQ5

Just wondering if anyone has tried 6GK6s in place of 6BQ5s and how the tube socket needs to be rewired.

Also how do the two tubes compare sonically?


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Old 26th June 2008, 05:58 AM   #2
Klimon is offline Klimon  Belgium
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For rewiring check the pinouts on the datasheets (duncanamps.com)

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Old 26th June 2008, 07:29 AM   #3
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6GK6 has the G3 run out to pins 1 and 9 whereas the 6BQ5 has it internally connected to the cathode (pin 3).

The anodes, Grid 1 and heaters are all the same (pins 2,4,5,7)

The screen grid of 6BQ5 is pin 9, change this to pin 8 for the 6GK6

The cathode of 6GK6 is pin 1 whereas it is pin 3 for 6BQ5
BUT pins 3 and 9 of the 6GK6 are Grid 3 which in the 6BQ5 is an internal connection back to pin 3. Just link pins 1 and 9 to pin 3 for the 6GK6.

change g2 connection from 9 to 8
link pins 1 and 9 to pin 3

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Old 26th June 2008, 03:16 PM   #4
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Thank Ian!

Exactly what I needed.

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