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I didn't want to get this tied up with my other post ,so I thought this would be easiest. Anyone know how many revisions there are for the Silverface Twin Reverbs of the early 70s with master volume with pull boost ? I see discrepancies in the layout ,and schematic that I have. One example : V3 pis 3&8 schematic ,and layout show 2 different resistor values. The amp actually has a 2.2K installed , but also has a 25/25 cap parallel with that resistor. The cap doesn't show in either the schematic ,or the layout.
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Look at the 100W master volume without the pull boost. There is your resistor and cap. fender is not unique in this, most companies tweak their designs as production rols along. Many times small changes are simply not documented.
http://www.webphix.com/schematic%20h..._nomstrvol.pdf
It is just a reverb driver, I doubt it matters a lot.Education is what you're left with after you have forgotten what you have learned. -
I had never seen this schematic before. Thanks Enzo !Comment
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Well here, the home page of that site. Go nuts, a zillion schematics you may not have seen.
Schematic Heaven. Where All Good Amp & Effect Designs Await Resurrection...Education is what you're left with after you have forgotten what you have learned.Comment
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Thanks Enzo. I had thought that site had folded. Glad they haven't.Comment
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What do you think would be the result of removing that cap ,and changing the resistor to the 470 ohm as in the schematic ?Originally posted by Enzo View PostComment
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Let me turn the question around. WHy would you want to? What would you want it to accomplish?Education is what you're left with after you have forgotten what you have learned.Comment
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I guess curiosity. See if it makes any difference in noise, tone ? Maybe I'll leave it alone. The schematic you have shown me references to the schematic # I am using with the push/pull MV. I guess that was one reason I wonder why my schematic is different that the amp it's used for.Comment
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You want to know what it sounds like? Tack a resistor parallel that 2.2k to make it 470. Standard value 560 ohms would calculate to a little under 450 ohms, 620 ohms would result in 480 ohms or so. or clip in a pot and dial it up exact, about 598 ohms. Now listen to the reverb. You like it or not, prefer it or not, but a 30 second test will tell you. Go ahead. You could also lift the cap, but I think that bypass cap will be a lot less influential across a 470 ohm resistor than 2.2k.Education is what you're left with after you have forgotten what you have learned.Comment
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Very cool. Thanks. I may have to try it just to see what difference there is.Comment
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Decided not to try this. I had read somewhere that it was changed because tubes were blowing too often.Comment
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