Antique radios, Old Time Radios
535-B
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Country:
United States of America (USA)
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| Identical to |
535-B
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| Similar
Tubes |
Normally replaceable-slightly different:
535-A
Other class quality (otherwise equal):
1659
; 2A6
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| Base |
6-Pin-Base U6A, old, USA
Top contact with a cap.
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| Was used by |
Technology / Measurement |
| Filament |
Vf 2.5 Volts / If 0.8 Ampere / Indirect / Specified voltage 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.)
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Dimensions (WHD)
incl. pins / tip |
x 115 x 34 mm / x 4.53 x 1.34 inch |
| Weight |
38 g / 1.34 oz |
| Information source |
- - Manufacturers Literature Boonton Manual
Tube Lore (II) p. 150
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535-B: Fin Stewart
Fin Stewart
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
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