Clean channel suddenly gone

[marzzz]

My ED is from early 2010, I turned it on this afternoon and I had no sound at all from the clean (green) channel. Blue and Red are fine, and it doesn't make a difference if the pedal switch is connected or not. May I assume it is one of the preamp tubes that suddenly went?

And do you recommend replacing with Mesa tubes, or is there another brand to consider?

 

[YellowJacket]

It may not be the cause but it is very likely. The fact that the clean mode uses different preamp tubes points heavily to this being a cause.

I personally like the mesa 12ax7s well enough.

 

[elvis]

I had the same exact problem. Bad preamp tube in a 2-hour-old set. Tubes are nothing more than cheaply made lightbulbs. Always keep spares and a tube diagram for your amp handy.

 

[jnoel64]

I use Tung-Sol in V1, V2, and V3. For V4 and V5, I use JAN-GE 5751. V6 and V7 both get Sovtek LPS. Those have been going strong for over 18 months. YMMV.

 

[marzzz]

So I switched the V1/V2 tubes (Hi/Lo) with the V4/V5 tubes (Clean) and all three channels work fine. Go figure! I guess a tube had worked itself loose, but the Dyne is in my studio and never gets moved. I generally play the clean channel 80% of the time, but while it was out I was using blue more frequently. As always, the amp just sounds great!

I'll order some replacements anyway, eventually I will need them.

 

[lespauljoe1]

So I switched the V1/V2 tubes (Hi/Lo) with the V4/V5 tubes (Clean) and all three channels work fine. Go figure! I guess a tube had worked itself loose, but the Dyne is in my studio and never gets moved. I generally play the clean channel 80% of the time, but while it was out I was using blue more frequently. As always, the amp just sounds great!

I'll order some replacements anyway, eventually I will need them.

Consider their SPAX7-A tubes. Around $4.00 more each, but I find they are a little quieter typically. They seem to reduce the buzz slightly when in the gain modes.