27-07-2016, 06:58 PM
Hi.
Why not feed the filaments from the sets mains transformer, leave the rectifier out and feed the HT from an external variable source? This would give you some idea what state the set is in, it would be a pity to replace caps if there are other problems elsewhere, Those beautiful cans can hide corroded coils and the possibility of faulty or low emission valves is quite high. If you don't have a variable HT supply your variac can be made into a simple variable HT supply with a bridge reccy and a 10uf cap (not critical) I do this on many sets that are dubious, a quick and easy lash up.
Why not feed the filaments from the sets mains transformer, leave the rectifier out and feed the HT from an external variable source? This would give you some idea what state the set is in, it would be a pity to replace caps if there are other problems elsewhere, Those beautiful cans can hide corroded coils and the possibility of faulty or low emission valves is quite high. If you don't have a variable HT supply your variac can be made into a simple variable HT supply with a bridge reccy and a 10uf cap (not critical) I do this on many sets that are dubious, a quick and easy lash up.
