Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: stratele52 on February 23, 2013, 08:02:59 am
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I'm looking for 2 pots for Mesa Boogie Head , .50 caliber +
These pots are for Presence and for Reverb . Customer broke the shafts
Can't find these pots on the web. I just find one place in United State but they don't ship in Canada.
Can you help me ?
Thank's
amprepairparts.com/pots.htm : they don't ship
Here whats I need and they have it ;
POT, MESA BOOGIE, 100K OHM LINEAR, (B100K), SOLDER LUGS, 24mm DIAMETER BODY, LONG "D" TYPE SHAFT, 3/8" BUSHING. Used in many earlier Mesa Boogie amps, especially their early combos. This pot has a plastic "D" shaped-shaft. Original Mesa Boogie part # 591050. DOES NOT INCLUDE NUT OR WASHER. IF NEW NUT IS NEEDED, ORDER THE JNUT-38 NUT FOUND IN THIS SECTION
Part #MB-591050
$5.95
POT, MESA BOOGIE, 250K OHM AUDIO, (A250K), SOLDER LUGS, 24mm DIAMETER BODY, LONG "D" TYPE SHAFT, 3/8" BUSHING. Used in many earlier Mesa Boogie amps, especially their early combos. This pot has a plastic "D" shaped-shaft. Original Mesa Boogie part # 591048. DOES NOT INCLUDE NUT OR WASHER. IF NEW NUT IS NEEDED, ORDER THE JNUT-38 NUT FOUND IN THIS SECTION
Part #MB-591048
$5.95
amprepairparts.com/pots.htm
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(http://amprepairparts.com/mb24lds.jpg)
It looks like a standard 24mm solder lug pot to me, just needs to have a "D" shaft on it.
Mouser, Newark, pretty much anyone will have that pot. Probably a Canadian company that has it, too...... It doesn't have to state it's specifically for a Mesa, just find the correct value, taper, lugs and shaft type and you're done!
G
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Can you find what you are looking for here ?
http://www.tubeampdoctor.com/catalog.php?product_search=mesa%20boogie%20pot (http://www.tubeampdoctor.com/catalog.php?product_search=mesa%20boogie%20pot)
they ship in Canada, but, unfortunately shipping price is very high
so you must find it at your side of the pond :sad:
K
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Do the knobs pushed onto a knurled shaft or do they have a setscrew? If setscrew, it's easy to convert a solid shaft into a "D" type shaft.
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(http://amprepairparts.com/mb24lds.jpg)
It looks like a standard 24mm solder lug pot to me, just needs to have a "D" shaft on it.
Mouser, Newark, pretty much anyone will have that pot. Probably a Canadian company that has it, too...... It doesn't have to state it's specifically for a Mesa, just find the correct value, taper, lugs and shaft type and you're done!
G
No they have not , I checked on ther web site
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Do the knobs pushed onto a knurled shaft or do they have a setscrew? If setscrew, it's easy to convert a solid shaft into a "D" type shaft.
Not set screw , I never saw a D shaft with set screw. Not knurled too.
To convert , yes easy , but I have to find a "medieum/ long" shaft a with log/ audio pot. This will be my second choice.
For now , I install pots with round shaft and screw type knob so my custumer can use his amp. I have time to find the original pots.
Thank's
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Have you asked from your area authorized repair places?
http://www.mesaboogie.com/US/Dealers/rep_select_2.php (http://www.mesaboogie.com/US/Dealers/rep_select_2.php)
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Have you asked from your area authorized repair places?
http://www.mesaboogie.com/US/Dealers/rep_select_2.php (http://www.mesaboogie.com/US/Dealers/rep_select_2.php)
Not yet but this will be one of my other options . I'm on this forum to find a place where I can order these part on the web. For now I fix the amp with round shaft pots with screw type knobs I have in stock . So my customer can use his amp . There is no rush for parts
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To narrow your search, according to this place the potentiometer is most likely CTS 450 series pot:
http://www.meinlshop.de/de/mesa-boogie/ersatzteile/elektronische-bauteile/potentiometer/potentiometer-591050/ (http://www.meinlshop.de/de/mesa-boogie/ersatzteile/elektronische-bauteile/potentiometer/potentiometer-591050/)
with 3/4", 7/8" or 1" flat shaft.
http://www.ctscorp.com/components/Datasheets/450sp.pdf (http://www.ctscorp.com/components/Datasheets/450sp.pdf)
Haven't find online shop yet, but digikey may have the 100k linear pot.
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To narrow your search, according to this place the potentiometer is most likely CTS 450 series pot:
=591050]http://www.mesaboogie.de/suche.html?tx_solr[q]=591050 (http://www.mesaboogie.de/suche.html?tx_solr[q)
with 3/4", 7/8" or 1" flat shaft.
http://www.ctscorp.com/components/Datasheets/450sp.pdf (http://www.ctscorp.com/components/Datasheets/450sp.pdf)
Haven't find online shop yet, but digikey may have the 100k linear pot.
Thank's ,
I have data sheet since friday and for linear pot ,yes it is easier to find , but where I can order the 250 K log / audio pot I'll find the 100 k too.
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For now I fix the amp with round shaft pots
Do these pots have the correct shaft diameter/length for the original knobs? If so, just file a flat on the shafts.
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For now I fix the amp with round shaft pots
Do these pots have the correct shaft diameter/length for the original knobs? If so, just file a flat on the shafts.
No , too short , I think of that before. I scrap one pot for a test , make a flat shaft.
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If the original pot is otherwise Ok, then you can order any value pot and just change the shaft.
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If the original pot is otherwise Ok, then you can order any value pot and just change the shaft.
Great idea to order the shafts.
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Fews days ago a I send a e-mail to CTS asking them if they can send me 2 free sample of molded plastic shaft . They answer to me , yes they will put in mail. Great company. Waiting for the shafts.
My customer , the amp owner, think he could ordered Mesa Boogie pots from USA ,with the help of the business he work. waiting for some news.
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If the original pot is otherwise Ok, then you can order any value pot and just change the shaft.
Receive some shaft fews week ago, I just dismantle pot ; can't replace the shaft ,it is all in one plastic uit shaft and wiper.
A real joke...
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Can't you use a small aluminium pipe (or aluminium duct tape) ad acrylic glue to connect the broken shaft with the new shaft ?
or, can't you find a new pot with round shaft and mold it with a file as to obrain a D shaft ?
K
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Reminds me of the faucet-rebuilding zone at Home Depot.
It's not like I wish we lived in 1974 Soviet Union or anything, but isn't it just great that we have 19 different kinds of pot shafts? We just *have* to have this, right?