Belseje:

Mivel kevésbé ismert típusról van szó, itt egy pár sor egy külföldi fórumról, amit én is most fedeztem fel:

I have heard, that there are at least three different versions - the last both with chip amp (monolithic IC's); MK-II with TDA1514/TDA1514A and mk3 with LM3875.
The MK-I version is a so called "original version" according several posts, developed from Michael Creek (or X-PRO, the same developer from it's successor, the A3i - I don't know exactly).

This version (with optional SRPP phono RIAA head amp modul) I know as a very fine sounded integrated amp despite sluggish/slow fuse in serial to the speaker connectors (instead DC protection relay contacts).

The schematic from this version I have and the topology is very close to those from douglas self blameless amp - only douglas self's buffer stage between the LTP and VAS stage isn't present here.

I've personally never heard the two later versions, but other user's tell me,
that they were disappointed about the sonic quality - compared to the first and discretely version from the A1 (BTW - in Germany the model name for the first version was "ATAC 3"/"ATAC3").

After check the images from the inside stuff (see attachments) the reason therefore is for me clear: Extremly cheap and bad capacitors for the power supply at both new versions of A1. Consequence is, that one hear mainly not the different amp topologies but the different quality standarts of the caps.

Tehát:
Ez lényegében egy első szériás, a következő szériáktól jobb minőségű A1-es. Jobb hang, jobb kondik, talán még Michael Creek-hez is köthető.
Viszont tudtommal ez nagyobb teljesétményű az A1-nél, 2*35W 8Ohm-on.