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RE: My Interstage PT is broken.

Posted by jvsorli@gmail.com (A) on September 1, 2011 at 15:09:28

In Reply to: RE: My Interstage PT is broken. posted by Acoustic-Dimension on September 1, 2011 at 12:15:42:

Hello Peter.

The fact that it was a defective cathode capacitor, and at first, only a periodic fault does at least explain why none of the experienced tubefanatics I have consulted have been able to give me the correct answer. :-p So I guess you could write that one into your book. But now that I do know what was wrong, I can't really explain why the resistor mentioned wanted to burn up. The capasitor does now charge very well, and only has a small resistance so it isn't completely short circuited or anything. But I guess it is logical that this sudden voltage on "signal ground" over chassis ground vould make amp go through the resistor between "signal ground" to chassis ground. Can you explain why it is constructed with a resistor between the "grounds" in the first place?

A little by the way. When this things happenes, the original fuse of 2A did NOT break! If I hadn't been there I guess there could have been a little fire... Well, the rectifier also works as a fuse. But why is the fuse so big in the first place? would 1A be more than enough?

Thank your for your ansert regarding the plate voltage.

best regards: Jon-Vegard

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