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535-B

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ID = 72578
       
 
   
Tube type:  Double Diode-Triode   Text 
Identical to 535-B
Similar Tubes
Normally replaceable-slightly different:
  535-A
Other class quality (otherwise equal):
  1659 ; 2A6

Base 6-Pin-Base U6A, old, USA Top contact with a cap.
Was used by Technology / Measurement
Filament Vf 2.5 Volts / If 0.8 Ampere / Indirect / Parallel, (AC/DC)
Description

The voltmeter of the Boonton Radio Corp. Q-Meter type 260A uses unique calibrated tubes, the 535-A, or 535-B, especially made, or selected from a 1659, for Boonton by RCA. It bears the 1659 designation on the glass with a specially marked base. (Low grid capacitance and low grid current are prime requirements as it operates as a leaky-grid detector with a 100M ohm grid-cathode resistance.)

 
Information source - - Manufacturers Literature   Boonton Manual
 

from Just Qvigstad

Usage in Models 1= 1939

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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