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535-A

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ID = 56945
       
 
   
Tube type:  Double Diode-Triode   Text 
Identical to 535-A
Similar Tubes
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 a unique calibrated tube, this 535-A, 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.) 
Literature - - Manufacturers Literature   Boonton Manual

 
boonton_535_a.jpg
535-A: RFJ
Roy Johnson

 

Usage in Models 1= 1953
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

535-A*Box
   

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