IkarusOnFire
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- Joined
- Feb 25, 2013
- Messages
- 12
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I own a mesa road king series 1 that has served me faithfully for years. Recently, however, a strange problem has occured: whenever i switch on reverb, the amp start squaling and feeding - makes it unplayable - it's quite loud.
- This goes for all 4 channels. It's less prominent in the clean channels.
- The noise occurs also whenever I switch on my fx loop
This is what I have tried:
- changing preamp tube in position V1 - this actually defeated the problem - but alas it reoccured only a week after
- changed preamp tubes one by one to see if it could be another problem. I had no luck (except, with a temporary fix with the v1)
- I have checked that I have russian tubes in v1,v2 and v5
- switched gz34 for 5U4s
What's in my amp:
- 2 x gz34
- 2 x JJ EL34
- 4 x JJ 6L6GC
- v1: JJ ecc83
- v2:JJ ecc83
- v3: JJ ecc83
- v4: JJ ecc83
- v5:JJ ecc83
What's in my fx loop:
- 1 t-rex analog delay pedal
Cables used:
- George L solderless
Guitars used:
- JEH custom with emg's
- JEH custom with BKPs
Amp works perfectly fine in all other states (meaning whenever reverb and/or fx loop is switched off).
Any ideas what this could be - or how I should locate the issue?
Thank you very much in advance!
//Marcus
- This goes for all 4 channels. It's less prominent in the clean channels.
- The noise occurs also whenever I switch on my fx loop
This is what I have tried:
- changing preamp tube in position V1 - this actually defeated the problem - but alas it reoccured only a week after
- changed preamp tubes one by one to see if it could be another problem. I had no luck (except, with a temporary fix with the v1)
- I have checked that I have russian tubes in v1,v2 and v5
- switched gz34 for 5U4s
What's in my amp:
- 2 x gz34
- 2 x JJ EL34
- 4 x JJ 6L6GC
- v1: JJ ecc83
- v2:JJ ecc83
- v3: JJ ecc83
- v4: JJ ecc83
- v5:JJ ecc83
What's in my fx loop:
- 1 t-rex analog delay pedal
Cables used:
- George L solderless
Guitars used:
- JEH custom with emg's
- JEH custom with BKPs
Amp works perfectly fine in all other states (meaning whenever reverb and/or fx loop is switched off).
Any ideas what this could be - or how I should locate the issue?
Thank you very much in advance!
//Marcus