18 Dec
2009
18 Dec
'09
11:22 a.m.
The second card is labeled "READ/WRITE AMPL. 30
IPS, 4TRK". The TO-
FWIW, the original QIC11 format was a 4-track serpentine (the 9 track
formats just interleaved new tracks with the original 4). And 30 ips was
one of the standard speeds (the otuer standard one was 90 ips IIRC). My
guess is this thing uses a stnadard tape format even if the interface is
custom.
100's are MC1710G (differential voltage
comparator). There are 4
uA709 op-amps on the thing.
The frontmost PCB is labeled "SERVO CONTROL, 30 IPS." and has 4 uA741
op amps on it, a couple of LM321H (TO-100) preamps, a couple of TO-3
darlingtons (MJ900, MJ1000) and an LM308 op-amp. But there are 6
trimpots, with no labeling other than "R9, R10, etc." which might be
a problem if adjustment were called for.
Do not tweak :-)
-tony