QB4/1100 4-400A Adzam Electron Tube Valve

Radio Tube Equivalents, PDF, Vacuum Tube

4-400A-AMP Transmitting Tube, Broadcast / Industrial, (NOS) 4-400A / 8438 / QB4 / 1100GA, Graphite anode, Limited Warranty, 90 Days, Over the counter.

4-400A/8438 Amperex Transmit Tube (NOS)

GZ37 VACUUM MULLARD TUBE RECTIFIER Made in GT.Britain tested 1 Pc

Oct 2016 Cat PDF, PDF, Vacuum Tube

Oct 2016 Cat PDF, PDF, Vacuum Tube

8438 Eimac Made in USA Vintage Power Tetrode Tube 4-400a Qb4

EIMAC - Transmitting Tubes - Tubes - Transmitting, Audio, Misc.

QB4/1100 @ The Valve Museum

QB4/1100GA - JAN 4-400A With Ventilated Base NOS Philips Valve

4-400A

QB4/1100 @ The Valve Museum

EIMAC - Transmitting Tubes - Tubes - Transmitting, Audio, Misc.

8438 Eimac Made in USA Vintage Power Tetrode Tube 4-400a Qb4

Vacuum Tubes: Transmitting & Receiving: 4

4-400A EIMAC Transmitting Tube NOS See Data sheet for more info.4-400A-EIMAC Transmitting Tube, Glass Envelope, MFR: Eimac NOS, Limited 90 Day

4-400A EIMAC Transmit Tube (NOS/NIB)