Page 92, D-BS-7404146-0-1 Tape Chassis, Power and Control There's this text on the document: NOTE: 1. R0, R1, L0 & L1 Licon PB Switch #01-112650 2, P0, P1, S0, S1, H0, H1, M0 and M1 Allied TDX 1349 mounted in Allied .....-.. sockets 3. Z1, Z2, Z3 & Z4 Bradley SE11 - #1296826 Selumium Arc Suppressor 4. M1, M2, M3 $ M4 Elinco Motor 50 cyc #DPJJX-2301-610 Elinco Motor 60 cyc #DPJJX-2245-610 --end-- Observations: H0 And H1 contacts associated with read/write heads. relays are two pole double throw (6 to 5 or 7; 15 to 14 or 16) with transistor driver (2,3) & coil (1, 4) Documentation suggests these relays are expected to switch contacts within 25 milliseconds. Contacts are rated at 1A at 110VAC. They are driven by -3 volts DC logic signals to the base of a transistor. The voltage supply across the coil and transistor is apparently -15V. Additionally relay M0 contacts are across the 110VAC line, and must be adjusted to a width of .018 to .025 inch. ALso, amateur travel is at least .010 greater than this gap. R0, R1, L0, L1 - two pole double throw with push button blue, orange, black H0, H1 - coil (1, 4) and transistor (2,3) These notes are from the LINC "Circuits" drawing 1349 Typical operate time: 7 msec Typical release time: 14 msec all resistors are 1/4 Watt +/- 5% (drawing of schematic, photos of relay assembly) Motor Caps are 2MFD 330AC for 60 cycle, 4MFD 370VAC for 50 cycle The Linc-8 used a Tek 561 oscilloscope for a display. General DC power for the system is -15V and +10V. during "marginal" testing -15 is spec'ed for +/- 3V, +10 for +/- 5V.