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Power supply voltage keeps changing from transformer output, [TOS #6: moved from General Audio]
john11
post Jan 9 2013, 04:34
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Hi And thanks for reading this post.

The ac output on my quad 405-2 amplifier's transformer is 71 volts but keeps going up and down by approximately 0.1- 0.3 volts everytime i measure it. Is this normal and is this the correct voltage. It is quite and old transformer from the 70's and i want to connect some new quad amp boards to it but am not sure if the output voltage is correct or if anything can be gained by exchanging for a new toroid/audio transformer.

Many thanks in advance. John.
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Arnold B. Kruege...
post Jan 9 2013, 14:04
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QUOTE (john11 @ Jan 8 2013, 22:34) *
Hi And thanks for reading this post.

The ac output on my quad 405-2 amplifier's transformer is 71 volts but keeps going up and down by approximately 0.1- 0.3 volts everytime i measure it. Is this normal and is this the correct voltage.


Probably. You are choking on a grain of rice!

Measure the AC voltage on the primary, its probably wandering around a tiny bit, too.

If the transformer were bad the variations would huge and mostly there would be no voltage at all.


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