QST, Jan 1978, p. 152.
QST, Dec 1979, p. 218.
QST, Apr 1980, p. 208.
QST, Apr 1981, p. 150.
Tubsers are solid state replacements for vacuum tubes. Developed by Skytec specifically for these Collins 75S-series receivers:
75S-1
75S-3
75S-3A
75S-3B
75S-3B
