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
Marshall Valvestate S80 Bi Chorus 212 Vintage Amplifier Model 8240 - YouTube
Marshall Valvestate S80 Model 8240 Stereo Chorus Amp | Reverb