Volume pedal as “attenuator” in JCM 800 4210 effects loop!!

Discussion in 'Marshall Amps' started by WholeLottaGlove, Jun 26, 2019.

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  1. purpleplexi

    purpleplexi Well-Known Member

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    Wrecked the whole thing for me. It's not as though Jimi couldn't afford decent gear....
     
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  2. zachman

    zachman Well-Known Member

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    He's not going to blow anything up doing this. The term attenuate is appropriate as all he's doing is attenuating down the voltage being sent from his reverb pedal output to the input of his delay-- w/ the volume pedal.

    To the OP, I would put the volume pedal first, so you don't cut off the reverb tails when pulling back the pedal. If you put it 1st, you'll attenuate the input signal feeding the input of the reverb pedal, and not affect the output sections.
     
  3. zachman

    zachman Well-Known Member

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    So the loop send signal isn't affected by how loud you have the amp set.
     
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  4. spacerocker

    spacerocker Well-Known Member

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    Putting a Volume pedal in the loop is NOT the same as using an attenuator in the traditional sense, and NO - it won't blow your amp up!

    What most people mean by an "Attenuator" with a Valve amp is a device between the amp and the speaker, which soaks up some of the output power of the amp. This means you can drive the power section harder and get some Power Section break-up at a lower volume than would otherwise be necessary!

    Using a Volume pedal in the loop is just reducing the signal into the power amp, and has exactly the same effect as turning the master volume down!

    The only advantage - and it may be a useful one - is being to control the overall volume without using your hands - e.g for a lead boost! - but to be fair, a device that switches between two levels (like an EQ pedal) would probably be more useful.

    But it is not an attenuator.......
     
  5. WellBurnTheSky

    WellBurnTheSky Well-Known Member

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    Might be that his amp's master volume has some kind of treble bleed, hence the difference in brightness ?

    Yup, I built myself a "dual volume box", ie a pedal that switches between two volume pots, with indicator LEDs (it also has a Klon-style buffer in front, might mod it at some point with a voltage doubler to improve headroom), it's super handy with the SV20H (or any head that has an FX loop basically) as it gives me pre-set rhythm and lead volumes. Super simple and cheap to build too, and I don't think there's anything available along these lines right now.
     
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  6. WholeLottaGlove

    WholeLottaGlove Active Member

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    Sure, it’s not an attenuator in the sense that a Fryette or Power Brake is. I understand that, for sure. I do notice a difference in sound, though. Does that have anything to do with the loop being after the master volume?
     
  7. Frodebro

    Frodebro Well-Known Member

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    More likely the reduced brightness is a result of additional highs being shunted to ground through the pot in the volume pedal.
     
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  8. charveldan

    charveldan Well-Known Member

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    You could just buy a real amp & real attenuator but its nice to pretend i suppose.

    I honestly can't imagine why someone would want to lower the volume on a 1x12 combo but it seems the trend.
     
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  9. WholeLottaGlove

    WholeLottaGlove Active Member

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    Dan, come up for air. Go ride your bike. Mow your lawn. Then have a beer. You’re running out of forums to be banned from.
     
  10. jstich

    jstich Well-Known Member

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    What other forums has he been banned from? Not saying I agree with him.
     
  11. Gutch220

    Gutch220 Well-Known Member

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    I got banned from the weather channel forum by saying it was always about to rain.
     
  12. Trapland

    Trapland Well-Known Member

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    No.

    You are correct that a volume pedal is not an attenuator. Regardless of what he is calling it, he’s not using it as an attenuator. He’s using it as a foot operated second master volume. If using a volume pedal in the loop could blow up an amp, then ANY pedal with a level control could blow it up. It’s a factory loop...the idea that a passive pedal in a factory loop could cause damage is just wrong. If you thought he was using a potentiometer as an actual attenuator before the speaker, then hell yes he’d blow something up.

    No reason a treble bypass cap on the pedal pot couldn’t solve that.
     
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  13. zachman

    zachman Well-Known Member

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    Don't emulate this please

    41585468_301983937246545_5760313775508946944_n.jpg
     
  14. jstich

    jstich Well-Known Member

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    Time for a smart ass trump photoshop pic.......
     
  15. charveldan

    charveldan Well-Known Member

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    [​IMG]
    He said he turns the MV all the way up & uses the volume pedal. The B+ must be going thru the roof on a 30 year old amp. Those channel switchers 2205/2210 series has switching issues & prone to channel bleed on a good day.
    His Polish master volume seems a really good way to stress an amp thats already passed its prime.

    [​IMG]

    Its suggested you don't play in traffic, doesn't mean everybody listens.

    What other wonderous electronic inventions has the OP come up with ?

    Overdrive pedal that doubles as a cell phone ?

    Making a Flanger out of a blender ?
     
    Last edited: Jun 26, 2019
  16. charveldan

    charveldan Well-Known Member

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    Why dont you stop being a Douche ?
     
  17. jstich

    jstich Well-Known Member

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    Polish? Youre better than that dan.
     
  18. charveldan

    charveldan Well-Known Member

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    Depends who you ask ...
     
  19. zachman

    zachman Well-Known Member

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    physician heal thyself
     
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  20. zachman

    zachman Well-Known Member

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    It's either true or not, regardless of who you ask. ;)


    Looks to me, like you started out with a chip on your shoulder over semantics/terminology-- making several incorrect statements of your own.
     
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