How to Fix Marshall Valvestate S80 Intermittent Sound - YouTube
Marshall Valvestate S80 Stereo Chorus Model 8240 2-Channel 2 x 40-Watt 2x12" Stereo Guitar Combo | Reverb Canada
RussAudio - Repaired and serviced a Marshall Valvestate S80 (model 8240) guitar amp. Fault reported:- Some sound, but no response from any controls. Extracted chassis for inspection. Electrically tested the 12AX7/ECC83 valve