For some time I have been having some trouble with my Fender ?63 Reissue Reverb tank. I?m getting a pretty weak mix of wet to dry signal. That is, even with the controls cranked up I?m getting a strong dry signal but you can only hear a bit of reverb decay ? about that of an amp?s reverb ? way. The brake is off.
It started shortly after I swapped out the 250k snap-in mix pot after long-time scratchiness finally lead to no signal. Worked fine for a short while then the problem I described above started. I?ve tried various combinations of tube changes with known good tubes.
The other pots were scratchy so today, I swapped those out but that didn?t help. I even put another new mix pot in there. After I changed the pots today it did not seem to do the trick.
Out of frustration a few hours later, I fired it back up and what-do-you-know, it was back in action! The only thing I noticed though was that when I had my guitar on 10, it would drive the input too hard and very harsh clipping would occur. As I was testing the limits of this harsh clipping, it popped back down into the problem described above ? the harsh clipping was gone but I was back to weak reverb.
Any ideas would be greatly appreciated.
Weak reverb from my Fender '63 reissue reverb tank
- digitaldrummer
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intermittent problems are tough... I had an intermittnet problem on my Blues Junior related to the tube sockets. When everyone switched to the ROHS solder, I think there has been a learning curve. Maybe not so much on a reverb tank (unless its sitting on top of the speaker cabinet) but in an amp/speaker combo there is a lot of vibration. the solder around the tube sockets can crack and when it heats up/cools down will make an intermittent connection. so that's where I'd start. re-flow the sockets and see if it helps any? just be careful not to overheat them.
fyi - found a schematic posted here...
http://www.emailtom.org/schematics/reve ... layout.gif
Mike
fyi - found a schematic posted here...
http://www.emailtom.org/schematics/reve ... layout.gif
Mike
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- audio school
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- Joined: Sun Jan 26, 2014 1:00 pm
- Location: Stockholm
Follow the test procedure in the service manual. I've had similar problems with a '63 Reverb, I ended up having to replace the transformer driving the reverb input. From what you describe, though, I think the problem lies after the actual reverb tank,
Thanks very much for both of your replies.
Based on the experience from someone on a different message board, I ordered a new reverb driver transformer. Installing that will require me to touch up the joints on the power tube socket. So, if it works you guys can both take credit.
Czakrisson--I actually get pretty strong reverb when I kick the tank (I don't actually kick the tank) so I am pretty confident the problem is before the tank itself on the input side.
Based on the experience from someone on a different message board, I ordered a new reverb driver transformer. Installing that will require me to touch up the joints on the power tube socket. So, if it works you guys can both take credit.
Czakrisson--I actually get pretty strong reverb when I kick the tank (I don't actually kick the tank) so I am pretty confident the problem is before the tank itself on the input side.
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