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Old 14th Aug 2018, 11:32 pm   #45
joebog1
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Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
Default Re: Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows

Quote:
Originally Posted by Boater Sam View Post
Risking ridicule, a suggestion.

Put a silicon diode 1N4007 in series with a resistor, say 2K @10w across each anode to the cathode of the GZ34 to advance the HT voltage rise before the GZ34 conducts the surge.

If that is heresy or stupid, just say.

It would be ideal if we could come up with a simple HT delay circuit when using silicon diode rectifiers. Using time delay and relays seems a bit archaic.
Sam.

As Sam has said, modern Fender and Marshall amps have those diodes there already, BUT without the resistor in series. That was what I was talking about in my previous post. It does make the amps more reliable, I guess because the GZ34 doesn't really do anything except keep the amp cabinet warm.

Joe
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