Hello, my names Andy AKA Diabolical Artificer. I build valve amps & interested in vintage tech as well as using a 545B daily as my main scope. I also have a 585A & currently trying to get a 547 working. I'm on a few forums as well as having a small Youtube channel where I post my doings.
I've been working on a 547 ser # 100091 for the last few weeks. after testing/re-forming all the big PSU caps I powered it up. After sorting some silly mistakes I'd made I checked all the PSU rails - all were in spec. However after the scope had been powered up for a few hours the EHT tfmr was found to suffer from the usual insulation breakdown. I replaced the EHT tfmr & replaced the valve diodes for silicon diodes.
I have a trace but it's not the full width of the CRT, it's "stuck" on the LHS. Suspected hor amp. I've done a lot of checking on the horizontal amp. I took DC voltage readings - noted a V reading on the OP of V584B cathode - +3.95v (should be 325v ish) I checked all the transistors (I'll call em Q's for short) in the scope as well as the diodes. I also checked the valves - all ok. Found some dead Q's - Q543 & Q554, replaced with 2N1893 & 2N4890. also found some dead diodes - D561 & a diode in TB B multi vibrator circuit. I used what I had, not the right Tek parts.
So, TB B is working, TB A not, I have limited X trace length also limited Y adjustment & no intensity adj. At the moment I'm concentrating on the X & Y OP circuitry then I'll move onto getting the TB's sorted. Any ideas where to look re X limited trace length?
Regards, Andy.
Diabolical Artificer