Marshall volume drop off help

4lf · 6th February 2009, 09:25 PM

Hi guys. Newb here. Trying very hard to learn to tech. Have had good luck w/ pedals, solid states, and other audio gear. Never messed with tubes. But I DO understand discharging caps.

I have a Marshall that plays just fine except the volume is muted quite a bit. When I touch any pot, the volume normalizes(is the correct loudness) I think it is some sort of short. Am I right? Any ideas?

Thanks for any help. I am reading a lot, working a lot, and trying hard to learn, so any help is appreciated.

4lf · 6th February 2009, 10:39 PM

It's a Master Model 100W lead btw.

wakibaki · 6th February 2009, 11:01 PM

It's not a short, more likely a dry joint or fracture or faulty switch or socket you are disturbing. Something mechanical, as touching an insulated knob should have no electrical effect.

A shotgun technique is to resolder every solder joint in sight. Otherwise poke around inside with an INSULATED probe with the amp on and see if you can localise the fault. BE CAREFUL. Keep one hand in your pocket.

You can sometimes see tiny sparks at a dry joint if you examine the amp in the pitch dark.

w

4lf · 7th February 2009, 08:26 PM

Thank you very much! That is indeed the problem!

6th February 2009, 09:25 PM	#1
4lf diyAudio Member Join Date: Feb 2009	Marshall volume drop off help Hi guys. Newb here. Trying very hard to learn to tech. Have had good luck w/ pedals, solid states, and other audio gear. Never messed with tubes. But I DO understand discharging caps. I have a Marshall that plays just fine except the volume is muted quite a bit. When I touch any pot, the volume normalizes(is the correct loudness) I think it is some sort of short. Am I right? Any ideas? Thanks for any help. I am reading a lot, working a lot, and trying hard to learn, so any help is appreciated.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bell 2122 volume drop off	bereanbill	Tubes / Valves	1	27th March 2009 08:08 AM
Intermittent drop-out and crackle at low volume	Sophie424	Solid State	6	25th February 2009 06:30 PM
modding a marshall ms-2 for more volume	methodofcontrol	Chip Amps	3	18th September 2006 09:09 AM
voltage drop across a CCS...	pedroskova	Tubes / Valves	4	8th August 2005 07:11 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

6th February 2009, 10:39 PM	#2
4lf diyAudio Member Join Date: Feb 2009	It's a Master Model 100W lead btw.

6th February 2009, 11:01 PM	#3
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	It's not a short, more likely a dry joint or fracture or faulty switch or socket you are disturbing. Something mechanical, as touching an insulated knob should have no electrical effect. A shotgun technique is to resolder every solder joint in sight. Otherwise poke around inside with an INSULATED probe with the amp on and see if you can localise the fault. BE CAREFUL. Keep one hand in your pocket. You can sometimes see tiny sparks at a dry joint if you examine the amp in the pitch dark. w

7th February 2009, 08:26 PM	#4
4lf diyAudio Member Join Date: Feb 2009	Thank you very much! That is indeed the problem!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)