Quote:
Originally Posted by rhing
I still have my Suppo GV-1, and I am finally considering the triode mode modification. With this mod, would it be safe to use Russian 6P14P-EV tubes, or does the amp only run 6P15P tubes?
When I play the amp, I hear a little bit of hum building up, and then a crackle with distortion for a split second on the left channel. This goes on until I power off the amp, so I'm thinking a cap or resistor has gone bad somewhere.
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6P14P-EV should be fine, biggest problem with this amp is EL84's with pin 1 internally connected to another pin. Measure this before you plug in the 6P14P.
And like tubesteve says, every type of tube needs a bit of different bias, but it's safe to power on and check. It's not like it's going to blow up in the first few minutes.
About the hum and crackles, also check the soldering joints...
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11th December 2011, 04:03 PM
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