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Having had all three Mark V's I can express my sympathy to your dialing challenges. On The Gear Page site a poster named dead astronaut posted the following (that I agree with). He is talking about the 5/25 but it applies to the 90W as well. I don't think he will me mind me re-posting it...

G Mac Sorry for the delay in posting. It looks like you are back up and running. I love my Mark V when its working :-). After 2 months mine is working perfectly. The low voltage rectifier fixed it. I’ve Gone from Love to Hate back to Love. There aren’t many tones I can’t squeeze out of it.

Update to the above: After a week back from the factory repair shop, the blink/reboot began again. Fortunately I kept pushing it until it failed altogether. I took it back to the Petaluma factory and they found a bad diode in the low voltage side of the amp (12v). They replaced all 4 of...

I agree with skoora. It’s the music you play that guides you. I’ll bet that everyone has a genre bias. That genre bias will cause you to favor one tube, and its tonal characteristics, over another. I prefer the el34’s in the mark v. I like a tight bass but NO ICEPICK! That desire is driven...

I had this “power blink” problem as well. About once per week the amp would power off/on in a blink and on reset to channel 1. Everything else was fine. My amp was manufactured just after Mesa fixed the diode issue (2015/16). I live in Northern California so I took my Mark V to Petaluma...

https://youtu.be/lJzoGUmzLoY

I’m a newbie here but I thought some folks might appreciate my solution to amp switching. I use a headrush pedalboard and drive a mesa boogie mark v 35 with it. Here is a short video of my solution.