Go Back   UG Community @ Ultimate-Guitar.Com > Instruments > Guitar Gear & Accessories
User Name  
Password
Search:

Reply
Old 07-16-2013, 04:18 PM   #1
Surf1975
Registered User
 
Join Date: Jun 2012
improving electrical contact in tube sockets?

I've been having a lot of trouble with my peavey 6505+ 112 combo ever since I got it. It randomly loses all its gain. I would switch out the pre amp tube closest to the back of the amp, and that would seem to do the trick for a little while, I had to do it several times. When that stopped working I took it to a local guitar shop and had their amp guy take a look at it. Apparently there was 2 lose pre amp sockets and a couple burnt capacitors. I picked it up yesterday and took it home without trying it. It sounded ok last night, but the gain seemed weak. I had the pre gain at noon and the post at 1.5-2. That amp should have more than enough gain, at those settings from what I've seen.

This morning I tried it and the gain had gotten even lower. I had the pre amp at 2 o'clock and still not much gain. So I took the preamp tube out of the socket closest to the back of the amp again, and reseated, and instantly got the 6505+ sound that we all know and love, sounded better than ever! It seem to me that the tube is not getting consistent contact with that particular socket. Before I took it to the amp guy, I tried electrical contact cleaner and as well as putting the tube in and out of the socket gently to make sure contact was maximized. Is there anything else I can do? It currently works fine now but I'm getting really sick of having to mess with this amp!
Surf1975 is offline   Reply With Quote
Old 07-16-2013, 05:14 PM   #2
fly135
Cheap Gear Enthusiast
 
fly135's Avatar
 
Join Date: Jul 2007
Location: Orlando
I've seen this problem a lot and it is because the solder joints on the pots and jacks can crack causing heat related changes. That's why it works for a while and then doesn't. This involves removing the amp circuit board and reflowing the solder joints on the pots and jacks.

It could be that removing and reinstalling the tubes is just flexing the circuit board enough to make it seem like that the problem is the tube. Of course this is only one possible diagnosis, but in my experience it's a very likely one.
__________________
Tasty Licks - A collection of my music

Last edited by fly135 : 07-16-2013 at 05:16 PM.
fly135 is offline   Reply With Quote
Reply


Thread Tools Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -4. The time now is 11:40 AM.

Forum Archives / About / Terms of Use / Advertise / Contact / Ultimate-Guitar.Com © 2014
Powered by: vBulletin Version 3.0.9
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.