Got a new Tverb. Took it to a gig last night. The orange (clean) ch would cut in and out on it. Even with no footswitch connected. Problably gonna take it to a tech. Anyone have any ideas what it could be?
Tverb orange ch cutting out.
- Thread starter droptrd
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Check the Tremoverb threads. Could be power tubes, preamp tubes, or LDR's. Make sure if you take it to a shop, it's authorized by Mesa. Mesa fixed my LDR issues under warranty even though my amp was over 10 years old, and I was not the original owner. That saved me some money for sure !! Recently, my TOV started motorboating. All I did was change power tubes, and it's fine.
Good Luck, Mike
Good Luck, Mike
94Tremoverb
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As with all things to do with faults on the Tremoverb, if there's a cutting-out problem on one channel and not the other, it's *not* tubes - all the tubes are in use all the time, on both channels - unless you have the FX loop assigned to one channel only.
My guess is an LDR, I just (literally today! It finally showed up for long enough to trace it) fixed a similar problem on the Red channel on mine, it was the LDR (8) that controls the output from the Red channel gain pot. This made the channel go quiet and clean, so it was obvious the problem was near the start of the signal path (ie pre-distortion). If it goes quiet and stays the same in terms of gan/distortion or goes completely dead, chances are it's one later on in the amp.
My guess is an LDR, I just (literally today! It finally showed up for long enough to trace it) fixed a similar problem on the Red channel on mine, it was the LDR (8) that controls the output from the Red channel gain pot. This made the channel go quiet and clean, so it was obvious the problem was near the start of the signal path (ie pre-distortion). If it goes quiet and stays the same in terms of gan/distortion or goes completely dead, chances are it's one later on in the amp.
94Tremoverb
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You can meter across them, but given how many there are and how difficult it is to get at the leads on some of them, it's much better to start by working out what functions the problem is affecting (which you have) and roughly where in the circuit it is (not much more work) then use the schematic and the switching logic chart to narrow it down. With mine I worked out that it must be one of only two possibilities before I even got the meter out.
With yours it sounds like it must be either LDR2 or LDR9 (Orange channel gain pot in/out - but as I mentioned, that would probably give you very low gain rather than complete silence) or more likely LDR12 or LDR18 (Orange channel tone stack/master volume in/out) - since those are the only ones that break the signal path on the Orange channel but not the Red. If the tone controls and the master still affect the amount of background noise it rules out 18, so my guess at that point would be 12. Obviously, if that isn't quite the set of results you get, modify accordingly.
It is just possible it could be something else too, but LDRs are by far the most common non-tube fault on these amps.
With yours it sounds like it must be either LDR2 or LDR9 (Orange channel gain pot in/out - but as I mentioned, that would probably give you very low gain rather than complete silence) or more likely LDR12 or LDR18 (Orange channel tone stack/master volume in/out) - since those are the only ones that break the signal path on the Orange channel but not the Red. If the tone controls and the master still affect the amount of background noise it rules out 18, so my guess at that point would be 12. Obviously, if that isn't quite the set of results you get, modify accordingly.
It is just possible it could be something else too, but LDRs are by far the most common non-tube fault on these amps.
Thanks for the info. Im gonna start with the LDRs cause its something Im capable of swapping out. Now my next question is where can I buy the new 5C9 LDRs? I supose I can call Mesa
If I cant get it working with swapping out LDRs then Ill have to take it to a tech.
If I cant get it working with swapping out LDRs then Ill have to take it to a tech.
torquelive
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I have a single rectoverb with this problem on the clean channel. Forgive my ignorance but what is an LDR? I keep getting this "dirty fart" noise on the clean channel almost sounds like digital clipping. I've tried almost everything i could think of that doesn't require a soldering iron. It also makes a pop/crackle noise when i put the amp on standby? Any ideas would be greatly appreciated.
94Tremoverb
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LDRs are optically-coupled switches - it stands for Light Dependent Resistor, although really this is only half the switch, the other half is an LED (Light Emitting Diode) inside the same encapsulated unit.
The Rectoverb is a completely different amp though - there are some different tubes used for each channel, and the switching is done with relays not LDRs, so it won't be that!
First, try changing preamp tube V2 (second from the input jack, next to the one under the metal cover) - V2A is used on the clean channel only. If you don't have a spare 12AX7, try temporarily swapping V2 for V3 - if the fault moves to the lead channel, it's the tube.
If it's not that it's likely to be a relay or some other issue as there are no other tubes that only affect the clean channel.
The Rectoverb is a completely different amp though - there are some different tubes used for each channel, and the switching is done with relays not LDRs, so it won't be that!
First, try changing preamp tube V2 (second from the input jack, next to the one under the metal cover) - V2A is used on the clean channel only. If you don't have a spare 12AX7, try temporarily swapping V2 for V3 - if the fault moves to the lead channel, it's the tube.
If it's not that it's likely to be a relay or some other issue as there are no other tubes that only affect the clean channel.
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