21HB5=21HB5A NOS (8 in stock)
By Tube World
$ 9.99
21HB5 NOS
4) GE
1) Philips
1) Sylvania branded RCA
2) Sylvania
See more: vacuum tube
By Tube World
21HB5 NOS
4) GE
1) Philips
1) Sylvania branded RCA
2) Sylvania