Amp Gurus--Need Tweed Deluxe Help

refin · April 13th, 2008, 12:43 AM

I think I've posted this before,not sure.
On a couple of my tweed amps (especially the '57 Deluxe),I can turn the volume knob on the guitar (any guitar) and get a scratchy sound through the amp.
Now,it's not the guitar.I read an article before by Gerald Weber which mentioned that certain amp parts have drifted from their values when you get this sound,and no amount of spray in the pots will solve the problem (I can't find the article).
Also,on the Deluxe,I still get sound with the volume pot on zero---it's real bassy,and the true sound doesn't kick in till about 2 1/2.The other volume pot (mic) is also on zero.
Any ideas? The amp was recapped about a year ago.
Thanks in advance!

Westerly Sunn · April 13th, 2008, 01:54 AM

Have you tried swapping out the pre-amp tube?

refin · April 13th, 2008, 10:21 AM

Yeh,I've swapped tubes.The article I read mentioned some resistors that have drifted from tolerance.

mr_hankey · April 13th, 2008, 11:18 AM

Quote:

Originally Posted by refin

Also,on the Deluxe,I still get sound with the volume pot on zero---it's real bassy,and the true sound doesn't kick in till about 2 1/2.The other volume pot (mic) is also on zero.
Any ideas? The amp was recapped about a year ago.
Thanks in advance!

I had the same problem on my Bassman. The filter cap of the preamp section measured open, and its grounding wire wasn't connected; so it couldn't do its job of preventing the signal from bypassing the tonestack and volume control; and thus being added out of phase to the signal coming off the second triode.

EMan · April 13th, 2008, 12:32 PM

Typically, this is a result of some DC voltage on the input jack.

Plug a guitar cord into the amp's input jack, and measure the voltage (DC) between the tip and the sleeve on the other end of the guitar cord.

April 13th, 2008, 12:43 AM	#1 (permalink)
refin Tele-Afflicted Join Date: Feb 2005 Location: Florida Panhandle Age: 52 Posts: 1,815	Amp Gurus--Need Tweed Deluxe Help I think I've posted this before,not sure. On a couple of my tweed amps (especially the '57 Deluxe),I can turn the volume knob on the guitar (any guitar) and get a scratchy sound through the amp. Now,it's not the guitar.I read an article before by Gerald Weber which mentioned that certain amp parts have drifted from their values when you get this sound,and no amount of spray in the pots will solve the problem (I can't find the article). Also,on the Deluxe,I still get sound with the volume pot on zero---it's real bassy,and the true sound doesn't kick in till about 2 1/2.The other volume pot (mic) is also on zero. Any ideas? The amp was recapped about a year ago. Thanks in advance! __________________ "For You,Lord,are good,and ready to forgive,and abundant in mercy to all those who call upon You." Ps. 86:5 http://www.soundclick.com/bands/0/refin_music.htm MASTER VOLUME? WHAT'S A MASTER VOLUME?

April 13th, 2008, 01:54 AM	#2 (permalink)
Westerly Sunn Tele-Holic Join Date: Jul 2006 Location: S.E. North Carolina Posts: 549 3 Photos	Have you tried swapping out the pre-amp tube? __________________ My white hairs had you fooled, didn't they, son? Yes, Sir! Ha! Drive on!!!

April 13th, 2008, 10:21 AM	#3 (permalink)
refin Tele-Afflicted Join Date: Feb 2005 Location: Florida Panhandle Age: 52 Posts: 1,815	Yeh,I've swapped tubes.The article I read mentioned some resistors that have drifted from tolerance. __________________ "For You,Lord,are good,and ready to forgive,and abundant in mercy to all those who call upon You." Ps. 86:5 http://www.soundclick.com/bands/0/refin_music.htm MASTER VOLUME? WHAT'S A MASTER VOLUME?

April 13th, 2008, 12:32 PM	#5 (permalink)
EMan Tele-Holic Join Date: Apr 2003 Location: Dallas, Texas Posts: 939	Typically, this is a result of some DC voltage on the input jack. Plug a guitar cord into the amp's input jack, and measure the voltage (DC) between the tip and the sleeve on the other end of the guitar cord.