I have a couple of V72s on my bench for repair; the problem is low output. I have traced the signal up to the output transformer but see nothing on the secondary side. The secondary measures 10 ohms on both. Seems a little low for an audio output secondary but since they measure the same, my first impression would be that the transformers are not bad.
I have disconnected the output transformers to make sure that there wasn't any problem with the wiring, so again it looks like 2 bad output xformers, but that just seems a little odd.
I have checked and double checked the units but with them both exhibiting the same problem (even though they are different vintages - besides the low output problem one of them has bad filter caps which appear to be older) I feel that I must be missing something.
My only other suspicion is that someone may have inadvertently plugged these into a hot phantom mic input and that's how both transformers got damaged in the same way, but that's just a wild guess.
I searched all over for bad or problems with V72 transformers, but have had no luck.
Any suggestions or advice would be appreciated.
Thanks
Mark Springer
industrial arts