while it may be a general "rule of thumb" some Gibson GSS had the "B" series of circuits
I believe that only the "B" version had the "Rock & Roll" switch on the front which makes that a pretty good indicator.
This switch bypasses the Tremolo/Vibration board, but like a pedal it isn't a true bypass, only the outputs of the Treble preamp and the Vibrato board are switched
I have a GSS-100 which has the "B" boards
It is very similar in design the American Thompson VOX Beatle amp (114/1141) amplifier of the same era.
On the Geofex web page there is a lot of information about fixing the output amp of the Beatle which is an interstage/totem pole amp as well.
I would go ahead and replace the Power Amp resistors and the bias trimmers. I've had go luck with several Thompson VOX amps by adding precisions resistors and new transistor sockets
I believe that only the "B" version had the "Rock & Roll" switch on the front which makes that a pretty good indicator.
This switch bypasses the Tremolo/Vibration board, but like a pedal it isn't a true bypass, only the outputs of the Treble preamp and the Vibrato board are switched
I have a GSS-100 which has the "B" boards
It is very similar in design the American Thompson VOX Beatle amp (114/1141) amplifier of the same era.
On the Geofex web page there is a lot of information about fixing the output amp of the Beatle which is an interstage/totem pole amp as well.
I would go ahead and replace the Power Amp resistors and the bias trimmers. I've had go luck with several Thompson VOX amps by adding precisions resistors and new transistor sockets