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34CM3

Indirectly heated high-current vacuum rectifier with a 33.5 V series heater, providing approximately 5.5 kV peak inverse-voltage capability and 400 mA nominal output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 33.5 V / 450 mA

Description

The 34CM3 is a vacuum rectifier. The supplied datasheet was used for heater, ratings, characteristics, and operating data; where the sheet explicitly states equivalence to a 6-volt parent, that parent electrical data is inherited while retaining this tube's heater characteristics.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 33.5 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 5500 V
Rectifier nominal output current: 400 mA
Rectifier peak forward current: 1.7 A
Rectifier forward voltage drop: 10 V
Rectifier max heater-cathode voltage: 5500 V

Inherited from explicitly referenced parent 6CM3; supplied sheet changes heater characteristics.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Capacitance

Plate to cathode and heater cp(k+h)
20 pF
Inherited from explicitly referenced 6CM3.
Heater to cathode ch_k
4 pF
Inherited from explicitly referenced 6CM3.
( ib) =
350 mA
Inherited from explicitly referenced 6CM3.

Other

Peak ibm
1700 mA
Inherited from explicitly referenced 6CM3.
Average Ib~a~)
400 mA
Inherited from explicitly referenced 6CM3.

Characteristics

Instantaneous Tube Voltage Drop
10 V
At 350 mA instantaneous plate current Inherited from explicitly referenced 6CM3.