Rhythm 2 channel not working

[Soundside]

Hi all, I'm a newb. I've got an 87 Mark III, no EQ. I just re-tubed it, and I noticed that the R2 channel is not working. I'm trying a bit of an experiment (maybe some advice on this would also help). I am using JJ KT66 and KT77 tubes. Sounds great to me, but, (1) could these tubes cause me any trouble, and (2) could this have anything at all to do with the loss of the R2 channel?

I haven't used the amp in a while, and decided to try to revive it and use it some. I had some tube issues and funky noises, so I decided to completely re-tube.

When I try to switch to R2, nothing happens. I just keep getting the same sound as before. Same thing if I try the footswitch. It just won't change channels.

Thanks!

 

[swbo101]

Could you elaborate on "When I try to switch to R2, nothing happens. I just keep getting the same sound as before". Does that mean if you go from R1 to R2 you still hear R1, and if you go from lead to R2 you still hear lead? or do you hear nothing? When you re-tubed did you also change your pre-amp tubes?

 

[Tuna141]

Are you using the footswitches to switch channels? Make sure that the Lead Drive knob is not pulled out. From the Mark III Manual"

LEAD DRIVE This knob adjusts the gain, sustain and sensitivity of the Lead Mode. Although it is responsive to the setting of Volume 1, its range is so great that there is usually more than enough drive available regardless of how low Volume 1 is set. At very low settings of Lead Drive it is still possible to obtain a relatively clean sound in the Lead Mode. Moderate settings (around 2 to 3, Treble Shift in) produce a good blues sound...like a Fender turned up full ... and yet the authentic stringy sound of the guitar still comes through. As the Lead Drive is increased, an entire musical range of great sustain and rich distortion harmonics is produced.The PULL switch built into the Lead Drive control duplicates the function of the Lead/Rhythm footswitch. This separate switch is a useful backup in case you lose your footswitch box or just don't need to change modes very often. The footswitch will work only when the Lead Drive control is pushed in. "

 

[Soundside]

Thanks for the replies,

Yes, all knobs are pushed in. When I try to change to R2, I get "no change". Everything is stuck in the "normal" mode. I can switch between regular rhythm and lead (either by footswitch or pull knob), but I can switch into R2 (either by footswitch or pull knob).

Yes, I changed all the tubes including preamps.

Keith

 

[Soundside]

Sorry, I meant "can't" switch to R2. it just stays in R1 (or lead).

kw