Traynor Beta 800 testing

[g1]

What about the 5W 2.7k resistor in parallel and to the right of C10?

That is only in the later versions, I don't think his version has that (post #1 schematic), but he can confirm.

[JP-Stereo]

There is no 5W 2.7k...

At the right of C10 there are 2x 100ohm 1w resistor (R8, R9) between the +65v rail and Q1 collector.
R10 and R11 are 4.7ohm 0.5w between Q1 and Q2 emiters and the ground.
And 2x other 100ohm 1w resistor (R12, R13) between the -65v rail and Q1 collector.

I will swap ZD4 and ZD5 to see if the problem move and repace ZD3 for a new load tested one.

I figure only Q2 will be left at that point.
Or since Q1 is triggered by the negative rail via ZD5, is it this one that regulate the negative rail ?

[g1]

I'm attaching the complete service manual for the earlier versions. See 'Important' note on pg.9. It's possible Q1 or Q2 may have been damaged.
Suggest you connect the amp boards like x-pro suggested. The bulb limiter may be what is giving you trouble. A variac would be better. Follow the test procedure on pg.9 and 4 of 'SM'.

edit: adding 'SM2' manual containing some other info

[x-pro]

Or since Q1 is triggered by the negative rail via ZD5, is it this one that regulate the negative rail ?

No. Q2 regulate the negative rail.

[JP-Stereo]

I am still waiting for some new BD649 from a different source.
I should receive them this week.
Hoping they will not be leaky

Then i will try the written testing procedures.