Quote:
Originally Posted by Zenith26kc20
T933! Love em! Most likely a shorted HV rectifier (may be a 3CU3, if memory serves me correct). I have never seen loss of drive on a T933 but have had a number of shorted HV rectifiers.
I have seen (and changed) a number of flybacks in them but I find that if the horizontal current is adjusted properly the flybacks don't give a problem. Always discharge the picture tube anode on this chassis. A shorted 3CU3 may give you a bit of a jolt once you remove the cap and try to remove the tube.
It is easy to check drive with the horizontal output removed if you have a VTVM. Just look for high frequency (AC) on the control grid pin of the horizontal output socket. A VTVM is necessary, digital meters get confused when reading this signal. A scope is good but be careful to make sure you are on the right pin. I can bring my schematic tomorrow and give more info.
By the way, a T933 is my avatar and a well used daily driver!
Oh, if the CRT looks like it is weak once you get HV back, the horizontal blanker tube is the main cause of this!
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Let me know if you get the schematic. These are the only tubes I have atm:
Rca 7558
Rca 6GK6
Rca 6GH8A
Rca 6GM5
Rca 5763
Rca 12AT7/ECC81
Raytheon 6AW8A
GE 6JE6C/6LQ6
GE 6JE6C/6LQ6
GE 6GK6
GE 7061
GE 7061
GE 6BJ6
Sylvania 6BA6
GE 6BJ6
GE 6BJ6
Raytheon 6AW8A
GE 12BE6
GE 6JE6C/6LQ6
GE 6BJ6
GE 6BJ6