2AV electron tube manufactured by United Technical Publications, listed as 2AV (circa 1965).

1AV electron tube manufactured by United Technical Publications, listed as 1AV (circa 1965).

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

16HJ electron tube manufactured by United Technical Publications, listed as 16HJ (circa 1965).

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

5HJ electron tube manufactured by United Technical Publications, listed as 5HJ (circa 1965).

2HJ electron tube manufactured by United Technical Publications, listed as 2HJ (circa 1965).

1HJ electron tube manufactured by United Technical Publications, listed as 1HJ (circa 1965).

500K electron tube manufactured by United Technical Publications, listed as 500K (circa 1965).

225K electron tube manufactured by United Technical Publications, listed as 225K (circa 1965).

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

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

300K electron tube manufactured by United Technical Publications, listed as 300K (circa 1965).

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

321S electron tube manufactured by United Technical Publications, listed as 321S (circa 1965).

D7 electron tube manufactured by United Technical Publications, listed as D7 (circa 1965).

D5 electron tube manufactured by United Technical Publications, listed as D5 (circa 1965).

D4 electron tube manufactured by United Technical Publications, listed as D4 (circa 1965).

4W electron tube manufactured by United Technical Publications, listed as 4W (circa 1965).

WW10J electron tube manufactured by United Technical Publications, listed as WW10J (circa 1965).