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58
Remote-Cutoff Pentode

EIA Base & Outline

EIA Base: 6FEIA Bulb: 12-2
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The 58 is a triple-grid super-control amplifier tube recommended especially for service in the radio-frequency and intermediate-frequency stages of a-c receivers designed for its characteristics. The 58 is characterized by the small overall size, the dome-top bulb, and the fifth electrode or suppressor with its own base pin terminal. Equally significant among its electrical features are the relatively low heater power consumption, the extended mutual conductance operating range, and the adaptability of electrode combinations to various circuit applications. The ability of this tube to handle usual signal voltages without cross-modulation and modulation-distortion makes it uniquely adaptable to the r-f and i-f stages of receivers employing automatic volume control. Shield construction and bulb shape are discussed under Type 57, which is similar in structural appearance.

When the suppressor is not connected directly to the cathode, its utility may be extended. The suppressor, in suitable circuits, provides a means for obtaining the desirable conditions of reduced selectivity for local reception. This operational characteristic makes possible improved loudspeaker response when the receiver is tuned to powerful nearby stations.

Mechanical Data

Bulb .......................................... ST-12
Base Type ..................................... Small 6-PIn
EIA Outline ................................... 12-2
EIA Base ...................................... 6F
Top Cap ....................................... Small Metal
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 2.5 V
Heater Current ................................ 1.0 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 5.2 pf
Output ........................................ 6.8 pf
Grid to Plate ................................. 0.01 pf

For other characteristics and typical operation, see 6D6

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Thu, 30 Jun 2022 03:04:52 -0700