Marshall MG100 FX master volume

Teleman55 · 04-10-2007, 04:23 AM

A customer brought me this amp after he replaced the MasterVolume pot.Now the Master only works when turned to about "8" and is uncontrollable.The owner claims to have used the same value as the original pot (50k).-So with this info I tried both Audio and linear taper pots (50k) with no apparent difference.I have no schematic but I assume he has the wrong value pot.I need help.

Amp Kat · 04-10-2007, 01:42 PM

Sounds like a connection problem. Check those pads real well and make sure they haven't been damaged or not making a connection. Put your ohm meter on the leg of the pot and check continuity to where the trace takes you.

Enzo · 04-11-2007, 06:29 AM

5k, not 50k. C taper

Marshall part number

VRCD0038 - POTENTIOMETER 1601 C5K 15MM

Teleman55 · 04-14-2007, 02:03 AM

Thanks Enzo, I had a 10k which seemed to work fine.I kinda figured it would be 5k or 500k,I guess the owner remembered the value had a 5 in it.I'm glad I keep some dead gear around to farm for parts.

04-10-2007, 04:23 AM	#1
Teleman55 Member Join Date: Sep 2006 Posts: 78	Marshall MG100 FX master volume A customer brought me this amp after he replaced the MasterVolume pot.Now the Master only works when turned to about "8" and is uncontrollable.The owner claims to have used the same value as the original pot (50k).-So with this info I tried both Audio and linear taper pots (50k) with no apparent difference.I have no schematic but I assume he has the wrong value pot.I need help.

04-10-2007, 01:42 PM	#2
Amp Kat Senior Member Join Date: Jul 2006 Location: Baton Rouge,LA Posts: 1,062	Sounds like a connection problem. Check those pads real well and make sure they haven't been damaged or not making a connection. Put your ohm meter on the leg of the pot and check continuity to where the trace takes you. __________________ KB

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04-11-2007, 06:29 AM	#3
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	5k, not 50k. C taper Marshall part number VRCD0038 - POTENTIOMETER 1601 C5K 15MM

04-14-2007, 02:03 AM	#4
Teleman55 Member Join Date: Sep 2006 Posts: 78	Thanks Enzo, I had a 10k which seemed to work fine.I kinda figured it would be 5k or 500k,I guess the owner remembered the value had a 5 in it.I'm glad I keep some dead gear around to farm for parts.

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