M U Inc 7234 High Voltage Pentode Regulator Vacuum Tube 24289 USA Untested

Listing details

M U Incorporated 7234 High-Voltage Regulator Pentode

This is a striking example of the specialized American 7234 high-voltage pentode—a substantial vintage tube with a tall glass envelope, impressive internal construction, a top-cap anode connection, and the distinctive presence of a purpose-built industrial component.

The photographs show the exact tube offered.

Under carefully angled light, the faint surviving original glass marking reads:

M U

7234

USA

24289

The number 24289 is the U.S. manufacturer/CAGE code assigned to M U Incorporated, supporting the exact brand identification and distinguishing this tube from generic 7234 inventory.

A separate marking etched into an internal metal component reads:

B4312

That marking is photographed and presented exactly as found. No unsupported date, batch, inspection, or electrical meaning is assigned to it.

Physical presentation

This tube presents very well:

Clear, intact glass envelope

Secure top-cap connection

Dark metallic getter

Straight nine-pin base

Complete and orderly internal structure

Strong internal supports

Faint surviving original M U identification

Light, even age-related surface toning on the pins

Minor surface marks on the top cap

The tall envelope and substantial internal assembly make this an especially attractive example for a collector, restoration specialist, equipment owner, or buyer seeking the correct M U-manufactured 7234.

Published 7234 type information

Published engineering data identifies the 7234 as a high-voltage pentode intended for control, regulator, and sweep-circuit service with operating anode voltages between approximately 3 and 8 kilovolts.

Published type specifications include:

Heater voltage: 6.3 volts

Heater current: 0.15 amp

Maximum anode voltage: 8,000 volts

Maximum anode dissipation: 10 watts

Maximum average anode current: 5 mA

Maximum screen dissipation: 0.5 watt

9KD nine-pin basing

Top-cap anode connection

T-6½ glass envelope

These are published specifications for the 7234 tube type and are provided to help buyers confirm the correct application. They are not individual test results for this tube.

Testing and packaging

This tube has not received an electrical performance test. It is offered accurately as an untested vintage tube, with its identity, markings, construction, and physical presentation documented in detailed photographs.

Supplied in a new white replacement box for clean storage and protected shipment.

The buyer receives the exact tube shown—not a stock photograph or a substitute.

It will be carefully packed with focused protection around the glass envelope, pins, and top cap.

VTubeAudio — individually photographed, accurately identified, thoughtfully presented, and securely packed.

Item specifics

Brand: M U Incorporated

Model: 7234

MPN: 7234

Tube type: High-voltage pentode

Application: Control / regulator

Manufacturer code: 24289

Base: 9KD nine-pin miniature

Top connection: Anode top cap

Heater rating: 6.3 V / 0.15 A

Country/Region of Manufacture: United States

Testing status: Untested

Quantity: 1

Packaging: New white replacement box

Internal marking: B4312

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