I have been fortunate enough to aquire these items and I am looking to restore them. A plastic pushbutton is missing from the preamp and the aluminium control knobs have a light corrosion on them. Should I attempt to clean these off? Also the amplifier has a valve missing. The one in the other channel in the equivalent position is an EF86, is it safe to assume that this is the same type? The label on the back is slightly damaged - I can see STA25 but the top right corner is missing. I understand that there were a few different MK's of this amp, is there any way of identifying which one this is? Valve line-up is as follows:- Rear of amp GZ34 EL34 Transformers in EL34 EL34 Screening Box EL34 ECF84 ECF82 ?MISSING? EF86 Front of Amp
Any other advice/help with this amp would be much appreciated. I suspect that it has not been used for quite a few years! TIA Roy