3. 5692s:
This section is unusual in that the provenance of the tubes contained within it is still a topic up for debate.
CBS-Hytron ‘Brown Base’ 5692
Possibly made by Raytheon instead.
Base: brown
Glass: clear, short bottle
Plates: large black flat-plates,
Getter: top, small getter flashing
Top mica: dual top mica, round with smooth edges
Other significant features: bottom mica identical to top micas, 5 extra support posts
RCA ‘Red Base’ 5692
Possibly made by RCA.
Base: red; color varies from bright cherry red to deep burgundy red, labels are white (earlier vintage) or orange (later vintage)
Glass: clear, short bottle
Plates: large flat-plates
Getter: top, small getter flashing
Top mica:
Other significant features: bottom mica identical to top micas, 5 extra support posts
Sylvania 5692
Base:
Glass:
Plates:
Getter:
Top mica:
Other significant features:
Standard Electric 33S03A/B
Made in Sweden.
Base: brown, speckled
Glass: clear, short bottle
Plates: large black flat-plates, blackening is inconsistent, one/both plates have numbers ‘scratched’ onto it/them
Getter: top, small getter flashing
Top mica: dual top mica, round with spiked edges
Other significant features: bottom mica identical to top micas, 5 extra support posts
