Could be Amperex or RF Parts tubes. https://www.rfparts.com/
73
Stan
KM4HQE
On 12/6/18 9:36 AM, Paul Baldock wrote:
I have two 3-500Z's that I removed from a Drake L4B. These tubes have
no brand labeling or residue of labeling. They are the variety that
have 5 Anode disks. Has anybody seen 3-500Zs with out brand marking?
- Paul KW7Y
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