Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mini612 on April 28, 2024, 09:57:56 pm
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This have been discuss before, but it is still not clear to me. I am hoping someone will clear this up for me. I have decided to build something similar to the Matchless Hurricane as my next project and currently in the process of gathering information but I am having difficulty understanding the tremolo section according to the schematic. The string of two .01 cap in series is a bit confusing. Yes, I've research and found some information but it is still not clear to me. I've read about soldering in a .047 - .1 cap across the depth pot lugs with the wiper going to the meeting of the two 220k. I've also read about, ".1 uf cap followed by a second .1 uf capacitor going to ground", how does that look like? So if the first .1uf is strap across the depth pot, I can understand that it's going to ground, but where is the other .1 cap going? Is it coming from the 1st lug of the depth pot (where the first .1 is strap) to the rest of the trem schematic?
Thanks for the help.
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The string of two .01 cap in series is a bit confusing. Yes, I've research and found some information but it is still not clear to me.
Not .01µF caps. They are .1µF. Two series .1µF are the same as a single .5µF cap. No magic. No confusion.
I've read about soldering in a .047 - .1 cap across the depth pot lugs with the wiper going to the meeting of the two 220k.
This will smooth the tremolo a bit. It will also decrease the intensity a bit, but EL84s are easy to wiggle.
I've also read about, ".1 uf cap followed by a second .1 uf capacitor going to ground", how does that look like? So if the first .1uf is strap across the depth pot, I can understand that it's going to ground, but where is the other .1 cap going? Is it coming from the 1st lug of the depth pot (where the first .1 is strap) to the rest of the trem schematic?
It's not clear to me what you are saying. Where did you read that? Is there a picture?
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Thanks Sluckey for commenting. And Yes! it's .1, not .01, that is my bad.
I was reading one of the earlier threads:
https://el34world.com/Forum/index.php?topic=25666.0
By: mebond11
"After Sluckey's comment that the back to back .01 uf caps in the hand drawn Tornado and Hurricane schematics didn't make sense (which I had replaced with a single .047), I thought I would look at the Matchless standalone Vibrobox schematic, on the theory that the circuits might be similar. It looks to me like the Tornado schematic is mistaken...not two .1 uf caps in series, but rather a .1 uf cap followed by a second .1 uf capacitor going to ground. Sluckey's suggestion of a .047 uf cap between the outside lugs of the depth control is essentially this second cap. I replaced the two caps with .1's, and it improved the tremolo...the first .1 reduced the max speed by about 25% and made it more musical and less harsh. I'm attaching the Vibrobox schematic if anyone wants to look at it."
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By: mebond11
It looks to me like the Tornado schematic is mistaken...not two .1 uf caps in series, but rather a .1 uf cap followed by a second .1 uf capacitor going to ground.
See pic. This is what we were talking about. Make this simple change. No need to do anything over by the depth pot on the schematic.
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The string of two .01 cap in series is a bit confusing. Yes, I've research and found some information but it is still not clear to me.
Not .01µF caps. They are .1µF. Two series .1µF are the same as a single .5µF cap. No magic. No confusion.
Missing "0"
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Missing "0"
Oops! :embarrassed:
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By: mebond11
It looks to me like the Tornado schematic is mistaken...not two .1 uf caps in series, but rather a .1 uf cap followed by a second .1 uf capacitor going to ground.
See pic. This is what we were talking about. Make this simple change. No need to do anything over by the depth pot on the schematic.
Thanks!!! I'm visual person so that pic certainly made a lot more sense. Curious, did you draw on the pic I attached or did you get that schematic from somewhere?
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I cropped and edited your drawing to match my discussion with mebond11. Mebond11 was last active April 07, 2024. Send him a PM or email if you want more info on this amp.