05-08-2012, 08:54 AM
(04-08-2012, 04:49 PM)Robert Darwent Wrote: I'd be most interested to know the HT current being drawn at the junction of the anodes of the 25Z6 rectifier and C26/C27 on the circuit diagram please. Not having my chassis up and running yet (waiting for the arrival of a NOS 25Z6) I can't as yet measure it myself.
Regards
Hi Robert, no problem I'll do that though I should mention that I'm not out of the woods just yet. I was checking voltages and the bias for the grids on the 6Q7 and the 25L6 is shown as -7.8v on the top of R12. Mine reads about -19V. Last night I checked all the relevant resistors (R6 through R14) and I replaced R6, R7, and R13. R6 and R7 were way higher than spec but R13 measured 80K versus the stated 250K. After all that the voltage at the top of R12 remained the same!! I may get some time to work on it today so I will keep at it.
Oh, and I've lost medium wave but the other two bands work fine. Hopefully that's 'switchery' though it's possible I've pulled a wire off in among the coils around the wave selector as it took a fair bit of messing about to get the electrolytic can re-fitted since one of the mounting nuts is underneath those coils - hopefully it's nothing too serious.
Cheers, John
Time flies like an arrow, fruitflies like a banana!







