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Old 12th May 2012, 08:24 AM   #1
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Default Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp

Hi all,

I trying to find out if I can replace the 6922 tube inside my CJ ET3 preamp with a 6FQ7. Anyone tried this? I know the 6FQ7 should be more durable but requires more fillament current which should not be a problem since the ET3 power supply is designed to support 3 additional tube filaments for the phono section which I do not have installed.

Any thoughts would be appreciated.

Thanks
ronenash
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Old 12th May 2012, 11:04 AM   #2
DF96 is offline DF96  England
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6FQ7 and 6922 are quite different valves which happen to share the same pinout. Any circuit properly designed for one would be sub-optimal with the other. If it sounds 'better' with the wrong valve in, then either you like listening to distortion or the original design was poor.

Those are my thoughts.
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Old 12th May 2012, 02:42 PM   #3
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Thanks DF96. This makes sense.
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