I have much enjoyed the recent discussion here about the 7T11/7S11/7S12 sampling plugins and have learned a lot from the contributions.
I have a long-term quest to get my Soviet Ya4S-100/Ya4S-101 sampling plugins working properly. They're roughly equivalent to the 7T11 and 7S11 but with some neat features, most notably a delta delayed timebase and slideback-type voltage measurement, both with digital display on the scope's readout. The problem is that I don't have the sampling head for them. I'm searching high and low for one (and learning quite a lot of Russian in the process) but they're like hen's teeth and always seem to have gone missing. The official sampling head is a dual channel feed through sampler with SR50-262 (almost identical to 'N' type) connectors for input and output. The good news is that the schematic is available, though seems to have been drawn by someone whose aim was to minimise the use of paper and ink rather than to create useful documentation.
The sampling plugin has a 19-way connector for the sampling head. This carries +/-15V, the signal and feedback for each channel, a single strobe, and a mysterious signal called 'threshold' which looks like a TTL logic output which alternates state on each trigger.
The good news is that my sampling plugins seem to be working well and all the signals on the connector do the right things, so the project is worth pursuing. My idea is to create an adapter cable so I can use Tek S-series sampling heads until I find the original one. I don't have any S-series heads at the moment, only SD-22 and SD-24 ones which involve too much software, so I'd have to buy one to try out.
I've looked at the manuals for the 7S11 and various sampling heads. Is there a clear specification anywhere of the interface, for example the amplitude of the strobe pulse and the signal and feedback connections? I would be quietly amused if the Soviet system turned out to be electrically compatible with the Tek one...
All advice and thoughts much appreciated,
Chris
