Originally Posted by
Firebottle
See if you can follow the wires from pins 4 and 5 on the valve base to where they come from at the power supply end.
The smaller transformer is almost certainly the one providing the heater supply, there should be a low voltage somewhere between 6 and 16V (depending if there is a regulator chip used) on one of the large horizontal capacitors between the two transformers.
If you are not confident about measuring voltages then take it to your local EE, there are high voltages present as well.
Thanks Alan, ive spoken with an EE today who said he can look at it in 3 weeks. Hes the local Audio research and Macintosh service guy so he knows his stuff. He also told me to turn it off and leave it be as there are lethal voltages inside so i think i may leave it to the pro’s on this one. I like my music (and life) to much to be found dead , with an old valve and screwdriver in my hands Was hoping it would be a simple in and out jobby i could solder myself but i dont fancy getting a serious shock or effing up a bloody good amp. Will just have to be patient on this one and maybe Glenn will reply this time with some more insight.
Thanks for taking the time to reply matey
Karl
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