1964 Fender Pro volume pot cracking sound

Forum to discuss amp circuits besides the 18 Watters and their ilk.

Moderators: JMPGuitars, CurtissRobin, colossal, zaphod_phil, Daviedawg, Graydon

Post Reply
fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

1964 Fender Pro volume pot cracking sound

Post by fernieite »

Hi guys,

My 64 Pro Amp (1x15" combo) has developed a loud cracking sound with the volume pot on the Normal channel. You can't even use it because of the noise! Even just turning the knob a hair is brutal.

Instead of taking it into a tech, I'd like to first determine if this could be a simple pre amp tube or something, like shooting some Deoxit into the pot?

Any suggestions? Thanks.
Last edited by fernieite on Sat 06/15/19 3:32 pm, edited 1 time in total.
0 x

User avatar
JMPGuitars
Super Duper Admin
Super Duper Admin
Posts: 1981
Joined: Tue 09/18/12 8:00 pm
Location: South Central, MA
Contact:

Re: 1964 Fender Pro volume pot cracking sound

Post by JMPGuitars »

It could be a number if things, including the pot, a connection to the pot, or a filter cap. With an amp that old, you can be certain the electrolytic caps need replacing if they haven't recently been replaced.

Do any of the other pots act that way? What happens when you adjust the tone pots in different positions and then try the volume pot again?
0 x
'I installed a skylight in my apartment yesterday... The people who live above me are furious.' - Steven Wright
Web Design: DolceVittoria.com
Guitars / Amps / Effects: JMPGuitars.com
(anti)Social: Facebook · Instagram
Items for Sale

fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

Re: 1964 Fender Pro volume pot cracking sound

Post by fernieite »

Thanks! I hadn't thought about the caps, they might be old. All of the other knobs on the amp are quiet. I'll have to try the tone knobs (treble and bass) and then the volume test...
Last edited by fernieite on Sat 06/15/19 12:28 pm, edited 1 time in total.
0 x

fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

Re: 1964 Fender Pro volume pot cracking sound

Post by fernieite »

Btw, here's an interesting article with a description of the mods and work that was done on my amp.(and a few pictures) I bought it from David Wilson from the Tonequest Report.
http://www.mercurymagnetics.com/pages/n ... RJUL08.pdf
0 x

fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

Re: 1964 Fender Pro volume pot cracking sound

Post by fernieite »

Here's a more recent photo with the rest of my amps.
IMG_0278.JPG
You do not have the required permissions to view the files attached to this post.
2 x

User avatar
crgfrench
Occasional poster
Occasional poster
Posts: 498
Joined: Fri 04/27/18 3:02 am

Re: 1964 Fender Pro volume pot cracking sound

Post by crgfrench »

Nice collection! Have you played the Herzog with the Marshall? I bet that would sound groovy.
0 x

fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

Re: 1964 Fender Pro volume pot cracking sound

Post by fernieite »

Thanks! - Oh yeah, you bet. It's fantastic! The Herzog can be added for just a little bit of overdrive, or just flat out fuzz! :twisted:
0 x

fernieite
Newbie
Newbie
Posts: 27
Joined: Thu 08/04/05 2:00 am
Location: Toronto (age 57)

Re: 1964 Fender Pro volume pot cracking sound

Post by fernieite »

Update: Turns out it was just a dirty pot! Deoxit fixed it. :mrgreen:
2 x

Post Reply