Hi Jim,
X-Y-Mode or generally swapping Y and X seems to be a good idea, also magnetic coupling perhaps by a wire.
However, I checked the situation already with stationary DC signals. I measured the X amp output voltages and everything seems in good order.
Actually I have no other idea except tilted plates inside the CRT. But how can this happen? If nothing else helps I try to build a differential amp with Y signals at the inputs and the output signals feeding into the first stage of the X amp. This will work fine up to some MHz which is sufficent for me, bcause I will use the 7613 as a display for a curve tracer and with sampling plug-ins, though only "nervous" DC signals. But this project will last months to years...
Regards
Loetroelli
