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There are no leds to indicate loop status. Yes,when the loop selector is set to bypass the loop output control is still active. I had a pedal plugged in the loop and no matter what the rotary selector was set to the loop was on. If you set the loop to ch3 and were currently on channel 2 you...

I understand what your saying and thats great in addition to efx return it can be used as a master with the other three level pots being channel volumes. But again, I went in to a store,found an identical mesa selected loop bypass and the Output ctrl has no effecton the amps volume. I'm just...

pg10 on mine 1.Assign rotary allows any combination...or completely remove it... Note: Loop bypass defeats front panel output and solo controls...etc. Like I said Loop bypass is selected and the Output control is still active. I went in to a store,found an identical mesa selected loop...

Even when the rear rotary pot is switched to bypass,the output control is still active. Any ideas? Is this normal with some mesa's?

Problem solved. There is an area where 200 volts leaves pin 8 of the loop 12ax and hits a resistor and orange cap then continues on. Well right at that eyelet a trace from the LDR runs extremely close to it and continues to the second relay. DC arc'd through(burned) the two points causing what...

You're tone is only so good as the weakest component in your chain. If you go from a hi dollar killer sounding head to a cheap efx box or rack and then back into your head,your tone is going to suffer. Whatever the frequency response/noise issue of that rack unit is,is your new limit. To verify...

He's just trying to explain why there are tonal and distortion differences between a single ended power section and a push-pull power section. This noise/distortion cancellation effect happens in any push-pull set up whether its class A or class AB. When your signal goes into clipping it...

I have been troubleshooting an older Dual Rectifier and am having a grand time. First there was popping noises along with a separate loud scratchiness on both channels volume pots. I discovered when the efx loop 12ax is pulled both noises disappear and the amp plays perfectly fine. I...