It was a good day today, i took the ST20 to barry at vyse amps where we spent the day discussing and learning about the amplifier. Going over the basics of valve amplifiers, how they work, reading the schematics and how it all comes together.
After that it was a case of testing the transformers and voltages which were all fine.
As predicted many of the components had drifted
, the power supply caps were leaky and way off. It was decided that all the components have to be changed, so i started with the capacitors first:
I was also taught how to test the valves using the AVO ct160. Most of the valves were good and i was lucky enough to have a quad matched set of mullard el84's RESULT!