I recently picked up a Pittbull Classic (Model G-100-CL, Serial CLD940202) that has some issues with the boost switches on both the clean and dirty channel. The boost is not enabled when either the switch is pushed in or out, however the boost is temporarily enabled when the switch is partially pushed in.
I’ve been trying to make sense of what’s going from the top of the board but it’s obviously challenging with no schematic. My wild guess would’ve been an LDR issue but it seems like the two boosts buttons might not even be impacting the same LDR?
Hi there PA, can you let me know if your footswitch is connected while you are trying to activate the boost from the front panel? If it is, please try to assign the boost to a channel from the front panel and then activate the boost from the footswitch. We can troubleshoot further to get this working properly for you if this is not the issue. Thank you!
Thanks Terry. I don’t have the original footswitch, but after testing I haven’t been able to get any standard foot switches to work for switching channels or enabling the boost. Let me know what the best next step is.
After a deeper look, it seems you have the dual TRS footswitch jack model. It may just be a dirty jack. Deoxit can be your friend with jacks. Makes sure the amplifier is completely off, spray a TRS plug (or a 1/4" jack brush) and try to clean the contacts up. Let’s try that first.
Hey Terry, sorry for the slow response. I didn’t see an email notification or anything and I just checked to find a message from a few weeks ago! You are correct this is a dual TRS model.
I did deoxit the jacks last night and confirmed it did not fix things unfortunately.
How did you apply the Deoxit? Directly on the jack contacts inside the chassis or by spraying it into the jack holes from the outside? If the latter, the cleaner will just blow past the contacts.
The way you’re doing it, you’ll only get the cleaner directly onto the tips of the parts that touch the plug.
You need to pull the chassis to get the spray in between the switching contacts which, if not making positive contact, will open and close randomly causing signal dropouts.
Also, use the cleaner as sparingly as possible. You don’t want to drench the contacts with cleaner.
Ok so I pulled the chassis and sprayed with cleaner, but that didn’t seem to change anything. I noticed while I was doing this that with the plug partially inserted into channel switch, it would change the channel. Shorting tip or ring to sleeve didn’t do anything, but then I tried shorting tip and ring to ground and everything worked. There’s some voltage on the sleeve for sure and it doesn’t go straight to ground. Same thing on the boost side. Attached a photo of the area.
