What color tubes for mark iv ?

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All of them !!! There is no real sonic difference, just different operating parameters. I've compared Yellows to Greys and there's nothing I could notice. Maybe if you compared Reds to Whites i.e the extremes, there may be a tiny difference ??? Don't forget all the Boogie colours correspond to the mid range Groove Tubes numbers. :D
 
tetsubin said:
Blue and greens are great for bluegrass.

I have found the best results when matching the stripe of my mark series amp to the rating on the tube. i put reds in reds, blues in blues, greens in greens. unfortunately the white labeled tubes and yellow labeled tubes are useless to me, and I have not been able to find any purple or + labeled tubes.
 

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