25R electron tube manufactured by United Technical Publications, listed as 25R (circa 1965).

75S electron tube manufactured by United Technical Publications, listed as 75S (circa 1965).

65S electron tube manufactured by United Technical Publications, listed as 65S (circa 1965).

55S electron tube manufactured by United Technical Publications, listed as 55S (circa 1965).

40S electron tube manufactured by United Technical Publications, listed as 40S (circa 1965).

30S electron tube manufactured by United Technical Publications, listed as 30S (circa 1965).

20S electron tube manufactured by United Technical Publications, listed as 20S (circa 1965).

200A electron tube manufactured by United Technical Publications, listed as 200A (circa 1965).

200F electron tube manufactured by United Technical Publications, listed as 200F (circa 1965).

160A electron tube manufactured by United Technical Publications, listed as 160A (circa 1965).

160F electron tube manufactured by United Technical Publications, listed as 160F (circa 1965).

100A electron tube manufactured by United Technical Publications, listed as 100A (circa 1965).

100F electron tube manufactured by United Technical Publications, listed as 100F (circa 1965).

80A electron tube manufactured by United Technical Publications, listed as 80A (circa 1965).

50A electron tube manufactured by United Technical Publications, listed as 50A (circa 1965).

50F electron tube manufactured by United Technical Publications, listed as 50F (circa 1965).

25A electron tube manufactured by United Technical Publications, listed as 25A (circa 1965).

25F electron tube manufactured by United Technical Publications, listed as 25F (circa 1965).

20F electron tube manufactured by United Technical Publications, listed as 20F (circa 1965).

10A electron tube manufactured by United Technical Publications, listed as 10A (circa 1965).