Maybe pull and check TR204. Also D206 and have a close look at C206.
I have come across into a possible issue with the power supply board, the one that looks really messy in the photo of the original post of this thread.
Resistor R206 is 33k, but in circuit it measures 1k. I removed it from the board and it measures 33k with my MM.
Replaced with a new resistor, and it also measures 1k in circuit.
But R206 from both other A-1's I have measure 33k in circuit.
So I figure there must be something wrong with the board that measures only 1k.
Maybe a bad component somewhere on the board is causing this.
I looked for any solder bridges but it looks ok there.
Need expert opinion here as to what may be causing this and how to track down and fix it.
Generally you can't measure a resistor in circuit, because you're measuring the resistance of everything else at the same time.
I ended up replacing 2SC1953 with 2Sc2682.
I hope it works out to be a good match.
I finally finished pulling out every transistor from each board and checking them carefully this time round.
Another transistor was found to be bad, 2SA914.
I read in one of Echowars posts that he recommended KSA1142 as a good substitute.
I can get 2SA1142 from a local supplier, which
I hope this is the equivalent of KSA1142.
I am also getting wierd readings for the four 2sk68 devices in the tone control board using the diode function of DMM and not sure if they good or bad. Are these fets or normal transistors?
In the sm it shows pinouts as ecb left to right looking at the flat side of case indicating normal transistors.
Googling 2sk68 shows these as jfets with pinout from flat side as d-g-s.
I am confused guys. I need advise here on what these 2sk68 are and how to test them.