[G Georgopoulos]

scotty is probably right,there is also another 22R close to output in both halves of the amp output,trace the pcb with the schematic to find out which 22R is,but first i suggest do a measurement of the output dc voltage is it positive or negative with reference to ground...

[KV4LQ]

scotty is probably right,there is also another 22R close to output in both halves of the amp output,trace the pcb with the schematic to find out which 22R is,but first i suggest do a measurement of the output dc voltage is it positive or negative with reference to ground...

OK.  Would it be safe to power up the amp with the final transistors removed?

[G Georgopoulos]

OK.  Would it be safe to power up the amp with the final transistors removed?

not in this design mate...lots of bias and feedback from o/p 

but you could check the o/p transistors out of circuit

[KV4LQ]

And how do I check the transistors themselves?

[G Georgopoulos]

And how do I check the transistors themselves?

too much time to describe here,basicly look for a short between emitter and collector(with multimeter)

here is a link on how to test
https://www.youtube.com/results?search_query=checking+transistors

[KV4LQ]

too much time to describe here,basicly look for a short between emitter and collector(with multimeter)

Sweet thanks

[DFXSLC nick]

Using a current and voltage regulated supply is probably the best way to protect your circuit and yourself at the level of troubleshooting that this amplifier seems to need. The 3B wont hate a variac but you can cause damage to circuits with voltage regulation, filament circuits etc. by under-powering the supply.