THD is Andy Marshall - there is a community of amp purists and designers which includes Mike Soldano, Fryette, Friedman, etc.
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and Andy was one of them.
These amps are built not just for pure tone based on the original Marshall and Fender amps of the 50's and 60's, but Andy included several features that make these special.
Dual bias capabilities eliminate the need for perfectly matched power tubes (which is a pain in the ass to find and expensive as well), swappable power and preamp tubes to get different tonal characteristics, a built in Power Sink varistor with speaker eq profile - you can crank the pre and power sections to 10 and then draw the output down to bedroom volume without external devices.
This comes with a set of yellowjackets - details below.
Those normally cost $75 a pair - I have three.
I had a Flexi 50 9 years ago and used it in my studio - I got the sweetest tone from it, rivaling the Bluesbreaker tone but with the Power Sink that took the ear splitting volume of the full output and pulled it down to bedroom level.
It also has a speaker "sim" output - the output buffered and mimicking the sound coming from a 1x12 or 2x12 Celestion Vintage 30 cabinet.
Its also a mixed Class-A/AB amp in that you can run it in single power tube mode or the twin dual phase power tubes with the flip of a 20W/50W switch on the front.
Its not a two channel amp, but it has a switchable boost mode that you can set up in many ways.
As I said, I had one, sold it then cried about it.
I bought this one a couple years ago and have used it in my home hobby studio - recording guitar tracks, profiling it on a Kemper and then a Headrush Prime to make it more portable (and safer, these THD amps are getting rare as Andy doesn't build them in bulk anymore) for coffee shop and small club gigs.
My favorite tone is on the 50W setting where I set up the amp to get to the soft breakup and compression on the head, set up the boost to just lift the level slightly, and then run my StewMac Ghost Drive (Klon) in front to make it scream.
It gets that perfect Hendrix / SRV tone in that configuration, breathing with your picking dynamics but you can also roll your guitar volume back to really clean it up.
The 20W tone will get you an almost pure Fender Princeton tone but with more girth - not as shrill on the top end and more body.
I've been running it through my Avatar 1x12 open back with Celestion Vintage 30s that have been cooked to mellow and break in.
Its the same set up I used in 2015 and sounds just awesome.
What are Yellow Jackets?
Yellow Jackets Converters are a type of specialized adapters which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6, EL34, and 7591 types.
How Do They Work?
They give you simple Class-A operation from any amp.
Yellow Jacket® Converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid bias voltage, while configuring the EL84 in a Class-A, Self-adjusiting cathode-bias circuit.
In other words, there are no adjustments to make and no modifications necesary, you simply plug the Yellow Jackets® into the amp's output tube sockets, (in cathode-bias amplifiers) screw the ground wires under one of the output tube socket mounting screws, plug the provided EL84's into the Yellow Jackets®, turn on the amp and play.
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