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"Stand back, I'm holding a calculator." - chinrest
"I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck H -
Fender Tech Notes - Vibrato Ticking Fix.zipOriginally posted by Jazz P Bass View Post
Here try this.
nosajsoldering stuff that's broken, breaking stuff that works, Yeah!Comment
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Yes, that is the one, I have no idea why mine won't open. And no idea why adding my sig to the file blanks it. I have added to schematics many many times.Education is what you're left with after you have forgotten what you have learned.Comment
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jason, it works. thanks."Stand back, I'm holding a calculator." - chinrest
"I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck HComment
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Okay I am stumped.
Below is a shot of my scope. The top distorted wave is from the output of the amp using the Vibrato channel. The bottom wave is from the output of V2b. The wave distorts when the volume control is turned past 4. All of the tone controls are on 5. The master volume is on 3.
With the Normal Channel I have to "dime" all the controls before the sine wave even slightly deforms.
I checked the tone and coupling capacitors and they all appear to be fine.
Any ideas?Attached FilesComment
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Any ideas why this website likes to rotate my pictures?Comment
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You are good at V2B, after that it goes through V4B, which the clean channel does not. How does the signal look at the output of V4B?Originally posted by Enzo
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At the grid and plate of V4b the sine wave has the top portion of the wave slightly squared off.Comment
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Is the master volume switch stuck "on"? That boost would bleed into V4B grid, I think.
Other wise, what voltage level of signal are you putting in, and how much is there at V4B grid? 4 on the volume sounds kind of hot, it would be better to try with master full and ch.vol lower.Originally posted by Enzo
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The plot thickens......
When I pull out the master volume boost knob the sine wave output reduces in height (volume).
Now I am really stumped!Comment
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Maybe it's wired backwards...
Okay, I didn't read the whole thread again, but it just kinda seems like it. With It in it's distorted and louder, but out its quieter? Is it still distorted (by ears, not scope)?
Justin"Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
"Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
"All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -Comment
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The switch is a double pole single throw so it cannot be wired backwards. It is either on or off.
Well I gave up and took the amp to a friend who repairs amps for a living. He checked it over with me present and said that it was working correctly. Boy do I feel like a dope.Comment
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Better to feel like a dope and have a working amp than to feel real smart and have an amp that doesn't work?
As to the switch, apparently it is OK, but don't take backwards too literally. A DPST has four terminals, and do a 180 and it works out the same. But if you wire it 90 degrees off. PFFFFT.Education is what you're left with after you have forgotten what you have learned.Comment
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