How to open a Peachtree Nova?

You're welcome. It baffled me for awhile.

If the Nova is like the Decco and has an obnoxiously bright LED under the center of the tube socket you can put a couple of drops of fingernail polish on the LED to tone it down or change the color. The Decco has a bright yellow LED which looks nothing like the real glow of a tube but I put two coats of dark red polish on it, waiting for the first one to dry before applying the second, and the result is a much nicer, soft orange.

I swapped the tube in the Decco for a Telefunken 7DJ8/PCC88, which works fine, but I can't honestly say I can hear much difference between it and the stock tube. Since the 7DJ8/PCC88 tubes work just as well as the 6DJ8, and they're often easier to find at reasonable prices, you might consider them for tube rolling.

Be careful when you do this... if your unit is gloss black the paint chips VERY easily on the edges as you slide the unit out of the cabinet.

Sfar, THANK you for this info. I'm giving that irritating LED a pedicure tomorrow.

Yeah, I'm thinking of buying fingernail polish in bulk and selling tiny bottles of it here as 'Stanley's Stereophile LED Liquid' for $69 an ounce. Think there's a market?

I'm getting good at the process. I bought a Jolida FX10 which has six tubes, each with a bright blue LED underneath. It's a great little amp and it no longer blinds me after having the LED's turned to a deep purple by that same dark red polish.

I don't think there's a market unless you cryo it first.

Those FX10 LEDs were a dealbreaker for me - glad you got that amp fixed too!