After a good research in the web and "tube rolling", I came out with this tube layout. It sounds pretty amazing. The ones underlined are the ones currently in the amp.
V1 12ax7 = Preamp normal channel (NOS JAN-GE 12AX7WA or new Tung-Sol)
V2 12ax7 = Preamp vibrato channel (NOS JAN-GE 12AX7WA or new Tung-Sol)
V3 12at7 = Reverb send/driver (NOS Mullard 12AT7WA / CV4024 or NOS JAN-Philips or new TAD)
V4 12ax7 = 1/2 Reverb recovery and 1/2 gain stage for vibrato channel (NOS JAN-GE 12AX7WA or new Tung-Sol)
V5 12ax7 = Vibrato (GT or JJ) no tone effect, any brand would work just fine
V6 12at7 = Phase inverter (NOS Mullard 12AT7WA / CV4024 or NOS JAN-Philips or new TAD)
V7 6L6 = Power tube 1 (NOS 6L6GT Svetlana "Winged C" or GE 6L6GC or new TAD)
V8 6L6 = Power tube 2 (NOS 6L6GT Svetlana "Winged C" or GE 6L6GC or new TAD)
V9 6L6 = Power tube 3 (NOS 6L6GT Svetlana "Winged C" or GE 6L6GC or new TAD)
V10 6L6 = Power tube 4 (NOS 6L6GT Svetlana "Winged C" or GE 6L6GC or new TAD)
If you don't use the channel 1 there is one interesting mod I found on fenderguru.com:
Use normal channel for reverb control to adjust EQ and depth of reverb.
"This mod is relevant only for two-channel amps with normal and vibrato channel. This trick is great for the reverb enthusiasts among us, and who is not? Plug your guitar into the vibrato channel, then unplug the reverb return cable on the back of the amp (the one that comes from the reverb tank output)* and plug it into the normal channel input. You will need a converter to go from male phono/RCA jack to a 1/4″ male jack. You may now use the normal channel as a reverb control where you can adjust the depth and tone using the volume, bright switch, treble and bass knobs (and mid if you have a Twin Reverb). The reverb knob on the vibrato channel will have no effect any longer. This mod is not applicable together with the Pull V1 mod, as you need the normal channel preamp tube." Fender Guru
*Note: looking from the back it should be the one on the left side "reverb output", grey cable tip.
Another interesting mod I found on robrobinette.com:
Put a capacitor to reduce ice peaks highs.
"If your particular speakers are giving you too many 'ice pick' highs simply adding a 100pF Mica capacitor across the feedback resistor will filter out some very high freqs that can cause ice pick highs. The cap allows high freqs to go around the feedback resistor so they are used for feedback which will reduce them from the amp's output. This is a nice, subtle mod that won't screw up your silverface's perfect tone. It's easy to use alligator clips to clip the cap in place temporarily to see if you like the mod. If you would like to cut even more highs than the 100pF cap, you can go all the way up to a .022uF cap to lower the filter's cutoff freq so more mid-high freqs would be cut. There's a small chance the Ice Pick Cap can induce oscillation at high volume. If that happens you can put a 4.7k resistor in series with the cap to reduce the very high frequencies that cause oscillation... This is an Ice Pick Cap on a 5F6A Bassman but it works the same way in silverface amps. Just put the cap around the 820 ohm Negative Feedback resistor." Rob Robinette
On this video below there is another mod to reduce the loudness, power and weight of the amp without altering the sound, great if you don't play in big stages.
Resources:
Fender Guru
KCA NOS Tubes
The Tube Store
On this video below there is another mod to reduce the loudness, power and weight of the amp without altering the sound, great if you don't play in big stages.
Resources:
Fender Guru
KCA NOS Tubes
The Tube Store
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