Just wondering.  Would really like to see the other guys that have purchased this amp get on here.

Updating...

Updating...

In anticpation of the amp arrival I snagged 2 quads of true NOS GE Japan (hopefully Matsushita) 6bg6ga from one vendor, and a quad of adapters from another, all on fleabay delivered for less than 165 bucks for the eight tubes and four adapters. 

From my experience with pre, rec, and power tubes, the build on Japanese tooling, whether originating from Mullard or otherwise, provided wonderful sound and durability, clearly superior to most current production offerings as well as favorably competing for same in their production era.

Why 2 quads? For more flexibility to deliver a particularly chosen current draw application.  Can have inner and outers' pairs biased hot and cold a la Mesa simulclass via natural current draw, or choose from all eight for the tightest possible match and swap in and out as drifting occurs during butn in, which is common for any powerful pentode, new production build and new old stock.

most recent update...

One good thing about waiting for a new amp to arrive has been the opportunity to research more about the amp itself and to do some tube experiments in similar operating environments, which recently caused me to rethink...

"It's my belief that my D-circuits require for bias to be set above a certain minimum, and that the tubes in them also have their own ranges depending on type. My ears say that if the tube can handle the circuit's bias needs that the sound is going to be very very good."

I was wrong...

Was playing out a few nights ago through my 50wOTS with a pair of GE blackplate 6bg6ga's, using a bassy 2/12 hempcone cab, was sitting in and standing a bit too close to the amp, could not use overdrive channel because of excessive feedback.... even standing to the gitbody side of the cab was not working. I had set the bias up to an average of 37mv current draw, and the amp was uncontrollable in anything much more than clean and clean PAB.  

Perfect storm of low power output tubes biased too hot, bassy cab, clean hearoom used up, underpowered power section wanted to distort and sustain, and guitar too close to the speakers.  I turned knobs front and back of the amp, found workable settings.  The stage volume was very, very loud, and since I was sitting in, I just rode in the bubble with it, we all had a great time.

A couple days later at home I sat across the room from a very loud, well warmed up amp, bias probes socketed, dropped to an average of 27mv, 65%-ish, tone was crisper and very sweet.  Sustain was excellent with much better control playing the floating block hollowbody gitbox that was so uncontrollable the night of fun.  The cleans gained  detail to the point of sounding HIFI in a very good way with gain knob at 4-ish and stayed fairly clean at a high volume.   Got low gain as well as Marshall-y lead tones, sustain was great bit also controllable, bloom was very very sweet, something very special about the GE tone here.  This is the tube I would use for a hollow, or semi hollow guitar.  I'd use the punchier, bassier Sylvanias for solid body guitars.  Rock/jazz switch, rock/jazz tubes, hmmm.  

I learned from the sesh not to bias to an a set point figure based on a self generated mistaken belief, the tube data proved to work better at high volume settings.  The missing headroom and amp control are back.  I know that the tubes are happier, the tones are just amazing, and now have a gorgeous sounding 30-ish watt amp as well as 50 without having to buy or attempt a separate low power build... in the time it takes to swap two tubes and rebias.  

While doing that I also assembled a tight pair of the higher horsepower family mutant Sylvania 6bg6ga's,  I got semi-prototypic "ODS build" tones using those repinned 7581a's with a plate cap.  According to my ears at loud or room volumes they could be biased a tad cooler than calculated, about 3mv down from the calculated 55%.  But I have a cheap DVM, could be some instrument error.  These tubes have bigger, punchier bottom end than the super sweet GE's and a nice crisp top, The Syl's offer up very Fendery cleans.  Preamp detail in OD comes through very crisply, great note and harmonic definition.  They come in gray and black plate, both types fairly similar in tone.

Finally, put the 19-22w GE's back in, rebiased, ear set the PI trimmer, and buttoned up.  Sweet, sweet ride.  Pleased by what I learned, glad to correct my mistake while sharing.  

SSS should arrive in a couple weeks...ready!

can you tell me why you picked those tubes?

I recently "ran into" an RCA labeled RCA 12ax7 and a GE labeled 12ax7.  would there be a good home in my amp for either of these?

ive got 4 Phillips ecg STR-387's in the power section which sound incredible. GE 12ax7 in the preamp, ge 12at7 for the reverb and a ge 5751 for the phase inverter. the 5751 in the phase inverter sound really smooth and allows me to get more gain while keeping the really good cleans. ive got it on top of a 2x15 cab with 2 jbl e130's. Im going to post some videos on youtube this week because the way mine is setup, It nails SRV clean tones from post "Texas Flood" era. with the deep switch engaged the bass sounds incredible through the two 15's.