@llamaluv
About dip-switches on the back.
There are tons of items in the market not offering any gain adaption via dip-switches or by other measures.
So a reasonable question to all other manufacturers would be: "Why don´t you employ such on your gear."
Instead you are asking the guys who offer a really outstanding gain adaption of nearly 40 dB (= factor 100) why these dip switches are situated on the back.
Well, there are two reasons:
1. For our opinion those dip-switches are not looking good on the front panel
2. The dip-switches are an aditional measure to optimize the amp.
You will have 98 % of the performance without touching the dip-switches.
About Class-A
Up to a specific output current all our V200 technology based amps, V200, V220, V280, V281, US 4, US 4+ will operate in Class-A.
Class-A was invented to reduce distortions of early semiconductor circuitry.
This is 60 years ago and the industry was busy to develop new and much better semiconductors in the meantime.
Nowadays, when there is (nearly) no distortion on well designed gear there is no need for pure Class-A.
Thank you, Fried