Musical Fidelity A1000 Versions and Upgrades

Hi, this thread is for the Musical Fidelity A1000 Amplifier.

I recently found out that the MF A1000 amplifier comes in at least two versions.
The power amp in the first version has 0,22ohm resistors, a A370 power amp design (proportional current).
The second version has mosfets in the preamp and the power amp has the same PCB as the F-Series amps with 0,47ohm resistors and a more traditional amplifier design.

What do you have? Which version sounds best?

For upgrades changing the rectifiers would be a good start, followed by better capacitors for audio. The contacts must be checked especially after a long distance transport and after working lots of hours at high temperatures. It gets really hot.

Here are two samples of the first version, repaired, upgraded and tested:
http://amp8.com/tr-amp/foreign/musical/mu-a1000.htm
http://amp8.com/tr-amp/foreign/musical/a1000-2.htm

Tomorrow I'll post some photos with the second version.

 

Second version Mosfet Preamp + F-Series Poweramp:

 

Serial Numbers

You have made an interesting discovery, do you know which serial numbers belong to which version?

Thanks for the info
CD-12