5U4GB Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
By Tube World
$ 34.99
5U4GB Sylvania Canada NOS 1960's
61/40
64/40
See more: vacuum tube
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 (similar build to RCA)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_1f6dc69b-0ab7-495d-8916-aa43bc55ed9b.jpg?v=1663029098){kind=link}
 (similar build to RCA) "Pin It")