I think the active components can be damaged first under the new higher load like the thyristors NEC A1156
I test now some things. The main problem of the defective left channel is on resistor R27 they have on one side a negative voltage of 315V and on R28 is a positive voltage of 315V between this two resitors the voltage falls to near 0V, the current goes up and the two resistors get very hot. On the resitors of the full working right channel there are all postive voltages! This problem goes directly to pin 6 on the tube socket there is on the defective left channel -315V and on the full working right channel +315V.
Is there a problem of the rewiring of the tube sockets?
Here are my rewire of the tube sockets:
(pin 4 and 5 bridged, trace to pin 5 cut, pin 9 wired to the inner circle)
and this was the template from a T1 found here in the forum:
I found also now a picture of T1S with a little different rewiring. The pin 9 cable on left channel (in the picture right side) goes to a other solding point
Edited by nemomec - 11/17/13 at 11:06pm