Noticed an extra ceramic cap after a tech job.

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JCDenton6
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Noticed an extra ceramic cap after a tech job.

Post by JCDenton6 » Sun Jun 03, 2012 7:54 pm

I remember when I first got my got my triple last summer, it worked fine for a week then most of the LDR's went south and I had to take it to a tech.
I had taken before and after shots just in case something went wrong while the amp was at the tech.

I had just noticed that there was an extra ceramic cap jumped to a resistor between the two ceramic caps below C24 while I was modding my amp a short time ago:

Before shot:
Image

After shot: (a wire is blocking the view)
Image

Anyone have any ideas about this?
Last edited by JCDenton6 on Tue Jun 05, 2012 2:17 am, edited 1 time in total.
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elvis
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Re: Noticed an extra ceramic cap after a tech job.

Post by elvis » Mon Jun 04, 2012 2:20 pm

That's a flux capacitor. Helps you get the tone from older music, as well as future stuff.

:mrgreen: :mrgreen: :mrgreen:
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JCDenton6
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Re: Noticed an extra ceramic cap after a tech job.

Post by JCDenton6 » Mon Jun 04, 2012 4:27 pm

lol :mrgreen:
I think it might have bumped the presence/high end up a little bit, I remember the amp being darker when I had it before the fix.
I have to find the schematics I downloaded a while back for a Rev G.
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94Tremoverb
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Re: Noticed an extra ceramic cap after a tech job.

Post by 94Tremoverb » Tue Jun 05, 2012 4:34 am

It looks like it's in parallel with the treble cap on the Orange channel, which would increase upper mids on that channel.

C24 is the mid cap for the Red channel, so the 47K resistor and the cap immediately below that are the slope resistor and treble cap for the Red channel; thus the "vertical" (in the pic) 1M resistor where one end of the new cap goes is the channel bridging resistor (which suppresses noise when switching), and the new cap is connected to the other end of it, hence is in parallel with the green-topped cap immediate below it, which is the treble cap for the Orange channel. (By process of elimination/deduction ;).)

Why he would do that unless you asked him to make the channel brighter/more present, I don't know. Unless the old cap has failed and he couldn't be bothered removing it...

JCDenton6
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Re: Noticed an extra ceramic cap after a tech job.

Post by JCDenton6 » Tue Jun 05, 2012 4:15 pm

Thanks for the reply 94Tremoverb, I was thinking the same thing as to why he put that in there (I thought the other cap may have died or bumped the presence up a little bit) I just didn't know exactly what it did. Thanks for the details and explanation. :)
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