Thread: mica capacitors
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Old 04-08-2015, 03:59 PM
Tom Albrecht's Avatar
Tom Albrecht Tom Albrecht is offline
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Quote:
Originally Posted by timmy View Post
so if the voltage that should be on pins 2-5 come from the focus circuit it should be there since i changed the resistors at the 6sl7 i think they were 6.8 meg and also all the 4.7 k resistors at the hv pots for horiz and verticle. the voltage behind the 6.8 meg resistors is around 900 volts, is this right or should it be higher. because what feeds the 2 6.8 come from the focus pot and also changed the 2.2 megs, 2, and the 2.7 megs. the hv is under 5kv. i dont know if this helps any but recently the hv oscillator tube suddenly the heater got super bright so i shut it down tried another one it was ok then i tested the one that went bright and it too was ok, i dont know why this would have happened.
Around 900 V probably is correct at the junction of R61 and R63 (6.8 M resistors on the plates of the vertical output). Your HV looks like it is fine. You mentioned 4.7 K above, but those should be 4.7 M (just a typo? or wrong value in there now?)

If you've got indication that some filaments are too bright, check the AC voltages on the filaments and see if something is wrong there.
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