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Do you guys know what the standard Mesa bias setting is for the 2:90 poweramp? Is there such a thing or is every 2:90 set differently when it comes to the bias resistor? Since Mesa is using color codes ranging from Red (lowest idle plate current rating around 20mA) to White (highest idle plate...

As far as I know, Mesa uses color codes to match tubes. Any tubes with the same color code are interchangeable. My question is this: If your Mesa tube amp has a set of four 6L6GC color code white tubes in it, could you replace that set with any other color without changing the bias resistor...

I need replacement tubes for my Mesa 2:90 and the current power tubes are the Mesa Boogie STR 420 6L6GC with the color code GR BLU. I thought about buying the new Tube Amp Doctor 6L6GCM-STR REDBASE power tubes but TAD is having problems coming up with plate current values that match the STR...

I'm considering buying a Mesa 2:90 power amp, but I'm not sure if I'd need to pay for a matched set of 8 x 6L6GC power tubes... Here's an imgur album that shows the current state of these tubes: https://imgur.com/a/U5I8j8G As you can see, these tubes have strange brown rings or black spots on...