1990 Marshall JCM 900 model 4501 50 watt Hi Gain Dual Reverb guitar amplifier, made in England, ser. no. Y08085
RussAudio - Repaired and serviced a Marshall JCM900 guitar amp (model 4501). Fault reported:- Went dead; service. Removed amp chassis for inspection. Visual inspection for distressed components and solder joints, etc. OK.