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
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By Tube World
21HB5 NOS
4) GE
1) Philips
1) Sylvania branded RCA
2) Sylvania