The only one I know of is this:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&rd=1&item=220028415386&ssPageName=STRK:MEWA:IT&ih=012
The main problem with the cd66 are the 10uF electrolitic capacitors in the signal path. Very strange for such a great machine. I've changed these to Mundorf MCAPs and at the same time changed the OPA2604 for two OPA627 smd opamps. This made u huge difference. The tubes are now goldpin longplates (ECC803S by JJ).
Buying gear from China sometimes comes with some problems (at least in my case). With the MHZS the tubesockets aren't that good and with one tube the heating pins didn't connect properly, resulting in a failing left channel straight out of the box. I also changed the sockets.
With modifying the power section I meant the caps. Bypassing larger electrolitic capacitors with mundorf or other. Putting little caps parallel to the rectifier diodes (or bridges), to reduce the 'clicking' of these diodes. Maybe even using special caps such as Black Gates.
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&rd=1&item=220028415386&ssPageName=STRK:MEWA:IT&ih=012
The main problem with the cd66 are the 10uF electrolitic capacitors in the signal path. Very strange for such a great machine. I've changed these to Mundorf MCAPs and at the same time changed the OPA2604 for two OPA627 smd opamps. This made u huge difference. The tubes are now goldpin longplates (ECC803S by JJ).
Buying gear from China sometimes comes with some problems (at least in my case). With the MHZS the tubesockets aren't that good and with one tube the heating pins didn't connect properly, resulting in a failing left channel straight out of the box. I also changed the sockets.
With modifying the power section I meant the caps. Bypassing larger electrolitic capacitors with mundorf or other. Putting little caps parallel to the rectifier diodes (or bridges), to reduce the 'clicking' of these diodes. Maybe even using special caps such as Black Gates.