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Is the green standby LED suppose to pulse with the tremelo on. I've noticed that the B+ varies with the tremelo too.
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Mine did that with the original tubes in it before I changed them out. -
Which tubes did you change...pre amp or power?Comment
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I replaced the original EH power tubes with JJs and the rectifier tube with an old Mullard I had hanging around. I ended up changing all the preamp tubes as well but that was for tone. It gave me an excuse to power it up and the lamp doesn't flicker any more.Comment
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The standby LED is very similar to the Peavey arrangment as used in 5150 and others. The LED itself runs off a low voltage rail. The B+ at the screen node is sampled off to the base of the transistor that controls the LED. There is no pulsing designed into it directly. If the screen node B+ bounces, then the LED current could be expected to fluctuate as well.
The trem sends a LFO signal into the EL84 grid return resistor tree. So the trem can modulate the tube current, and that could affect B+ voltage.
Vox could be aware of the effect, and it doesn;t hurt anything. Not thinking it was on purpose though.Education is what you're left with after you have forgotten what you have learned.Comment
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Thanks for the advice. I just didn't want to go chasing my tail for a non critical issue.
Time is money as you guys well know.Comment
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