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1948 Machlett ML-357B Transmitting Tube NOS – Raytheon / WHOM-AM Ridgefield Park NJ – NIB
                                                                    

Description

Machlett ML-357B High-Power Transmitting Vacuum Tube
Manufactured April 24, 1948 – Made in U.S.A.

Offered is a new old stock (NOS) Machlett ML-357B high-power transmitting vacuum tube, preserved in original factory packaging and accompanied by the original Raytheon Company shipping carton.

The Raytheon shipping label identifies the destination as the WHOM-AM transmitter site, Ridgefield Park, New Jersey, a professional AM broadcast facility operating during the post-war era of American radio. This establishes the tube as original transmitter-grade stock supplied directly for broadcast service, not consumer distribution.

Condition

  • New Old Stock (never installed)

  • Original internal packing cradle present

  • Pins show no solder or insertion wear

  • Getter flashing appears dark and uniform

  • Stored unpowered since manufacture

  • The original Raytheon shipping carton, while intact and structurally sound, shows light age-related staining consistent with storage and handling over more than 70 years

Manufacture & Identification

  • Tube Type: ML-357B

  • Manufacturer: Machlett Laboratories (distributed by Raytheon)

  • Date Code: April 24, 1948 (factory marking on base)

  • Intended Use: Professional RF transmitting service

Radiation Symbol Notice

The radiation warning symbol present on the tube is a period-correct manufacturer marking applied to high-voltage transmitting tubes. The tube itself is not radioactive. The marking reflects the operating conditions for which the tube was designed.

Testing

This tube has not been electrically tested and has been intentionally left unpowered to preserve its NOS condition and historical integrity. It is offered as a collector-grade broadcast artifact, not guaranteed for operational use.


Documentation Included

  • Printed Certificate of Provenance (included inside the box)

  • Museum-style display card suitable for archival or exhibit use

Ideal For

  • Broadcast history collectors

  • Vacuum tube collectors

  • Museums or educational archives

  • Display or historical reference collections

Shipping

The tube will be professionally packed with extreme care appropriate for a heavy glass transmitting tube.
The original Raytheon shipping carton will be preserved and placed inside a separate outer shipping box for transport.

Item Specifics

  • Brand: Machlett

  • Type: Transmitting Tube

  • Model: ML-357B

  • Year Manufactured: 1948

  • Country/Region of Manufacture: United States

  • Condition: New Old Stock (NOS)

  • Testing: Not Tested

  • Vintage: Yes

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