My 6600 arrived , V3.2
I swapped out the powersupply for something slightly better ,although the stock item seems to have been improved a bit ,it now has 25 volt low esr caps on the 12volt rails ,and the yellow x cap, 1mohm ,and slot by the opto are back ,its on a fibreglass board marked Feeltech V1.1
I have a transformer 2x17v and 8v which I will try later once the linear regulator board arrives .
I changed the dial on the encoder too ,the original is a bit small for the fingers to grasp.
I dont like the way the heatsink is mounted on the output Ic's ,due to a difference in height it doesnt seem to make good contact , I have two 3095 output ic's ,so I'll sort the heatsink out when I get those soldered in .
I tried the version 5.5 software ,one weird thing was that it seems not to respond when I switch on or off the channels via the front panel ,not sure if this is only one way communication here.
I still have to do some proper tests to check voltage and frequency cal .