Biasing a PS-2A?

Stage & Studio Power Station PS-2
1

Eventually all tubes will wear out and my question is if there are any instructions available for biasing a pair of new 6L6? Mine are still fresh, but when they eventually wear out (or fail) I want to be prepared to be able to perform a quick swap to have the PS-2 up and running again as quickly as possible, because I kind of depend on it and I only own one.

2

Hi Carl,

No re-bias is needed. Any matched pair can be used with the PS-2A. So just make sure you have a back-up set of 6L6s and a 12AX7. Any brand of tubes is OK.

3

HI Dan,

Thanks for the response.

I was under the impression that the PS-2A had fixed bias and cathode bias and then different sets of 6L6:es will give different bias measurement in all other fixed bias guitar amps I have ever owned or used.

I’m not questioning what you are saying, but does the PS-2A have some sort of clever auto bias feature or is there another explanation to why one doesn’t need to set the bias when replacing the 6L6es?

With other fixed bias tube amps I know, too low bias will make the amp under perform, while too hot bias with shorten the tube’s life.

Thanks,