This looks like an original Model Two power amp too.
... the amplifier card of the right channel has double pairs of Motorola output transistors
either 2N3773/2N6609(old) or 2N5632/2N6229(new) - the output transistors of the left channel I have never seen.
On first view it is hard to believe that the Model Two is a "rearranged" Double Dyna 400 but
if one compares the schematics of both amps they look alike except of the 2N3440 current mirror
of the Model Two.
The Model Two is a very reliable amp.
The only failure I had decades ago was the switch-on current limiter.
So I had to replace the triac(Q6015L5) and the movistor(2502 GEKB) as described on
page 2.3-4-1 in the service manual.
The Model One (potted modules) is flawless ever since.
I think, I will reread the review of the Model One in "the absolute sound", number 11, winter 1978
by J. Tamblyn Henderson and the "Manufacturer's Comment" on page 359:
"We agree with your observations that optimum sonic results are achieved using the Model One preamp
with our new Model Two power amplifier,..."
Thank You, Mr. President