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Thread: 2meg Pot For Gibson Scout Amp

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    2meg Pot For Gibson Scout Amp

    I have a GibsonScout amp that I've had since 1966. It has a 2meg audio taper pot in the reverb unit. When I turn it up past 7, it starts to drop out and lose volume, so I assume it's going bad. I decided to replace it, but it seems like 2meg audio taper pots are as rare as hen's teeth. Does anyone know where I can get one? or a substitute that doesn't compromise the original integrity of the circuit?

    Thanks

    Rocky Hill

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    Supporting Member The Dude's Avatar
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    Have you tried cleaning it?

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    yes

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    Lifetime Member Enzo's Avatar
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    Do we have the schematic on this, and like you could post it?

    What pots do you have on hand? If you have a common 1 meg pot, try it in the circuit. It surely cannot harm anything, and if the result sounds OK to you, then it is OK.

    Remember, it is only a guitar amp, not NASA lab gear. You can take wide liberties with the components.

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    Supporting Member The Dude's Avatar
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    You might contact Torres Engineering and see if they still have them. They used to. It doesn't spec taper in the link, but they use them for guitar, so my bet is that it's audio taper. It might be worth a phone call to find out.

    https://torresengineering.stores.yahoo.net/2megpot.html

    Edit: Here's the schematic:

    Click image for larger version. 

Name:	GibsonScoutSchematic1200.jpg 
Views:	30 
Size:	601.8 KB 
ID:	55581

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    Stray Cap DrGonz78's Avatar
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    I have seen where people have cleaned the carbon track with a pencil eraser ✏️. Many old pots can be taken apart to the point where the inside wafer is completely accessible. If the eraser trick won't get it clean then it might be the carbon has become compromised. In that case just install 1 meg pot like Enzo suggested.

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    Fender 3Meg pots are quite common and available..


    I'm trying to find an Ampeg 4 Meg with switch at full clockwise for the trem/after beat function.

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    Old Timer Leo_Gnardo's Avatar
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    Once again Enzo hits the spot. I have used common 1 Meg aud taper pots in Gibsons and other ancient amps where 2M are original installs, no problem at all. Slug one in there and worry no more.

    What gets me about many old Gibsons & Epiphones, the reverb level is independent of the volume control. For a lark you can dial the dry volume to nothing, and play "all the way in the back of the tunnel."

    drewl, I've never seen a 4 Meg w/ switch like what you need for those blue shower curtain Ampegs. Nor any other pot with the switch activated at full clockwise. You might experiment with a 1 Meg pot with pull switch instead. Lucky for me, I haven't yet run across an Ampeg that needed the 4M, but surely one of these days one will pop up. Tomorrow. Guaranteed. It's 10 minutes to midnight. Murphy will see to it, you know he will....

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    Quote Originally Posted by rocks66ss View Post
    ...it seems like 2meg audio taper pots are as rare as hen's teeth. Does anyone know where I can get one?...
    Rocky Hill
    Tubesandmore[dot]com has them. $1.60 each. 2M Audio Taper, Alpha, 3/8" bushing.

    Justin

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    The one part I always prayed would not break in my 67 Reverberocket 2... Then I sold it.

    Jusrin

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    "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. -
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    As can see there is a path to the v1 plate to ground through 500pF cap , so maybe big 2M resistor is matter. You can fit one 1M resistor in top of more common 1M pot and then get half of max signal for reverb stage, but think can be recovered in output changing 1M resistor to 470k in mixer output divider. Just my 2cents...

    and btw. found mostly of 1M audio pots to be into more 800-850k range
    If Y ou choose to use 1M instead 2M you have to change the 500pF cap as well

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    Quote Originally Posted by Leo_Gnardo View Post

    drewl, I've never seen a 4 Meg w/ switch like what you need for those blue shower curtain Ampegs. Nor any other pot with the switch activated at full clockwise. You might experiment with a 1 Meg pot with pull switch instead. Lucky for me, I haven't yet run across an Ampeg that needed the 4M, but surely one of these days one will pop up. Tomorrow. Guaranteed. It's 10 minutes to midnight. Murphy will see to it, you know he will....
    Someone had tried a 500K but trem is too weak with that.
    I was thinking of using a dual couple Meg pot and use one side as the after beat switch.

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    Quote Originally Posted by The Dude View Post
    You might contact Torres Engineering and see if they still have them. They used to. It doesn't spec taper in the link, but they use them for guitar, so my bet is that it's audio taper. It might be worth a phone call to find out.

    https://torresengineering.stores.yahoo.net/2megpot.html

    Edit: Here's the schematic:

    Click image for larger version. 

Name:	GibsonScoutSchematic1200.jpg 
Views:	30 
Size:	601.8 KB 
ID:	55581
    Thank you very much for the link, I appreciate it very much.

    Rocky

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    Quote Originally Posted by Justin Thomas View Post
    Tubesandmore[dot]com has them. $1.60 each. 2M Audio Taper, Alpha, 3/8" bushing.

    Justin
    Thanks for the info, I believe they will be able to help.


    Rocky

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    thanks for everyone's help, it's much appreciated.


    Rocky

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    Bent Member Chuck H's Avatar
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    Quote Originally Posted by Justin Thomas View Post
    Tubesandmore[dot]com has them. $1.60 each. 2M Audio Taper, Alpha, 3/8" bushing.

    Justin
    I only found a linear pot in their offerings. That wouldn't be a deal breaker for me for that particular control though.

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

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    Bent Member Chuck H's Avatar
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    Quote Originally Posted by The Dude View Post
    You might contact Torres Engineering and see if they still have them. They used to. It doesn't spec taper in the link, but they use them for guitar, so my bet is that it's audio taper. It might be worth a phone call to find out.

    https://torresengineering.stores.yahoo.net/2megpot.html

    Edit: Here's the schematic:

    Click image for larger version. 

Name:	GibsonScoutSchematic1200.jpg 
Views:	30 
Size:	601.8 KB 
ID:	55581
    The pots Dan had were linear. He use to claim that his guitar volume control bright circuit (just a parallel cap and resistor) "smoothed out" the taper of any pot with "feedback" and made them all equal

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

    "Back to the amp. It makes horrible sounds when I play my guitar thru it... because I suck at playing guitar." Mike6158

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    Bent Member Chuck H's Avatar
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    Quote Originally Posted by drewl View Post
    Fender 3Meg pots are quite common and available..
    Pretty sure the Fender 3M pots are REVERSE audio taper. Used for BF vibrato circuits.

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

    "Back to the amp. It makes horrible sounds when I play my guitar thru it... because I suck at playing guitar." Mike6158

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    Bent Member Chuck H's Avatar
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    Here's a 24mm 2M log pot made by Alpha Taiwan. You can order these right from them 1000 pieces at a time, but apparently that doesn't happen much and these guys are charging a premium ($10.00 + shipping!) It has Alpha Taiwan's shitty 6mm x 7.2mm thread bushing, but that's the brakes. No one sees that part anyway. Straight from China. Probably shipped on the slow boat.

    https://www.ebay.com/itm/5pcs-A2M-Po...oAAOSw3qdc54sm

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

    "Back to the amp. It makes horrible sounds when I play my guitar thru it... because I suck at playing guitar." Mike6158

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    Quote Originally Posted by Chuck H View Post
    Pretty sure the Fender 3M pots are REVERSE audio taper. Used for BF vibrato circuits.

    Yup, reverse.
    Sounds fine in the trem circuit.

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    Quote Originally Posted by Chuck H View Post
    I only found a linear pot in their offerings. That wouldn't be a deal breaker for me for that particular control though.
    Fibsh, yer right... I thought I did better research than that...

    Jusrin

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    "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 -

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    Bent Member Chuck H's Avatar
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    Quote Originally Posted by Justin Thomas View Post
    Fibsh, yer right... I thought I did better research than that...

    Jusrin
    I found the same pot you did on a *oogle search. But when I clicked it it took me to a more general inventory page where it wasn't included. A search for 2M pots on the site revealed there was only the one linear pot.

    I think it's sort of the same thing as deceased accounts on *acebook. They say that in ten years there will be more dead people accounts than live ones

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

    "Back to the amp. It makes horrible sounds when I play my guitar thru it... because I suck at playing guitar." Mike6158

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    Cool!
    People can live on forever with their FB accounts, long after they're dead!
    Maybe pay friends or family to update long after being deceased!
    We can live forever, or at least our experience's long after we're gone.
    Someday a thousand years from now scientist's will gaze in wonder how we repaired ancient technology.

    Or not m

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    Bent Member Chuck H's Avatar
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    Quote Originally Posted by drewl View Post
    Cool!
    People can live on forever with their FB accounts, long after they're dead!
    Maybe pay friends or family to update long after being deceased!
    We can live forever, or at least our experience's long after we're gone.
    Someday a thousand years from now scientist's will gaze in wonder how we repaired ancient technology.

    Or not m
    Need another

    Immortality may not be what we'd hoped for. But I suppose this is the the next best thing?

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    "Never bet your life on somebody else doing their job." SoulFetish's good friend

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

    "Back to the amp. It makes horrible sounds when I play my guitar thru it... because I suck at playing guitar." Mike6158

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