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In the Forum: Melquiades Amplifier
In the Thread: R22
Post Subject: Was that loaded or unloadedPosted by anthony on: 1/3/2022
 Domidaw wrote: |
| I also checked the voltage of the TR2 transformer and although the marking says 440v, it really has 508v!?!?
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Domidaw, when you read 508V for TR2, was the transformer in the circuit with a load applied or was it out of the circuit by itself? Power transformers will give high secondary readings without a load applied but when the expected load is used they should reduce to the specified voltage. One of the signs of a good transformer is little difference in secondary voltage between unloaded and loaded.
But if that is 508V reading in-circuit then there is 60-70V too much there too. What current are the power transformers rated for, or how many VA? Maybe TR2 and TR3 are designed for much higher loads which is why when used in Melq we are seeing over-voltage. I would also check the voltage of the secondary feeding the bias circuit.
Btw, I commiserate the feelings you are having right now...I've been there...but it sure does feel good when the problem is found.Rerurn to Romy the Cat's Site