This is a pair of NOS vacuum tubes designated "RB" and made in the USA.
Tested on a Hickok Model 752A for mutual conductance. Results are:
750/750 and 700/775, where minimum is 350/350. Tubes are 8 cm tall.
RCA 5692 Brown Base Vacuum Tube NOS Matched Pair
- Product Code: RCA 5692 NOS Matched Pair Vacuum Tube
- Availability: Out Of Stock
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$89.99 USD
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Tags: RCA, 5692 Matched Pair, Vacuum Tube