29-11-2012, 05:26 PM
I have just seen your plea for the manual for the EMI/SE Labs SM112, but happily you seem to have found a copy. The SM111 and EM102 are very different, and will be very little help all for the SM112 / SM599 / SM602 (100Mhz,dualtrace, double TimeBase). cf SM111 -20Mhz,dual trace single TB (also NATO CT570/3), and the EM102D / EM530 - 30Mhz,double beam,delayTB.
If you are still stuck for the manuals, let me know.
The mains plug/socket is the small Bulgin P429. See my recent posting upon the SM111 for more details. Very safe and reputable, but overtaken by the fashion for moulded plugs as "safer".
The trigger pot you talk about is the Trigger Level, which changes the DC level of the signal to the Trigger Multivibrator TR49,50,51, so that you can trigger on different parts of the signal. Happily it doesn't use any tunnel diodes, unlike Tek and HP at that time. (1970 to 1977). Trigger feed failure - clean all the switches, and check the feed to the TB on pins 8 and 1 on the Y plugin, and then follow through the Trigger Source and Trigger Coupling switches on the TB. I assume the Auto Trigger setting produces a trace, but not synchronised.
The SM112 is fairly highly stressed to get the performance, and the output transistors for both the Y and X amplifiers tend to go. The Y uses 2N5109 and BFW30 which are very scarce. 2N3866 is nearest easily available. The X Output is easier, with TV driver types BF178 n & V765 p.
Watch the zener diodes as they fail frequently, and that pulls the rest of the amplifier out. I find my SM112 has to be watched very carefully. Whereas my SM111 just keeps going, when all other have failed. wme_bill m0wpn
If you are still stuck for the manuals, let me know.
The mains plug/socket is the small Bulgin P429. See my recent posting upon the SM111 for more details. Very safe and reputable, but overtaken by the fashion for moulded plugs as "safer".
The trigger pot you talk about is the Trigger Level, which changes the DC level of the signal to the Trigger Multivibrator TR49,50,51, so that you can trigger on different parts of the signal. Happily it doesn't use any tunnel diodes, unlike Tek and HP at that time. (1970 to 1977). Trigger feed failure - clean all the switches, and check the feed to the TB on pins 8 and 1 on the Y plugin, and then follow through the Trigger Source and Trigger Coupling switches on the TB. I assume the Auto Trigger setting produces a trace, but not synchronised.
The SM112 is fairly highly stressed to get the performance, and the output transistors for both the Y and X amplifiers tend to go. The Y uses 2N5109 and BFW30 which are very scarce. 2N3866 is nearest easily available. The X Output is easier, with TV driver types BF178 n & V765 p.
Watch the zener diodes as they fail frequently, and that pulls the rest of the amplifier out. I find my SM112 has to be watched very carefully. Whereas my SM111 just keeps going, when all other have failed. wme_bill m0wpn
