(1) Tested Very Strong Q.R.S. Redtop 01A Tube (UV 01A).
Red bakelite base with short (UV) brass pins.
Tight and secure base with no looseness.
This tube tests as NOS (see below).
I
(1) Tested Very Strong Q.R.S. Redtop 01A Tube (UV 01A).
Red bakelite base with short (UV) brass pins.
Tight and secure base with no looseness.
This tube tests above NOS specs (see below).
In the mid to late 1920s Q.R.S., famously known for their piano rolls, produced "Redtop" detector/amplifier tubes with "double filaments, double plates and double grids..." while boasting "Redtop Radio Tubes are Better".
The original label is still intact with some minor loss and the "redtop" has a good portion of color left.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Test Result = 700 micromhos
Minimum pass/good = 460
NOS Target Value = 690
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