Transmitting Tubes

The 8171 / 4CX10000D is useful as an oscillator, amplifier, or modulator at frequencies up to 110 megahertz and is particularly suited for use as a linear RF amplifier or class-AB audio amplifier.

Data Sheet

Clean Used * No longer available for export
MFR: Eimac
SKU: 4CX10000D-P

The 4CX250B/M is a ceramic/metal, forced-air cooled external-anode tetrode with a maximum anode dissipation rating of 250 Watts. The 4CX250B/M is intended for use in applications where tight control of electrical specifications is required and replaces the 4CX250B in all applications. This tube utilizes a ruggedized internal structure and utilizes a welded anode cap for improved reliability.
New Old Stock * No longer available for export
MFR: Eimac
SKU: 4CX250B/M-EI

Special, Broadcast/Industrial
New Old Stock * No longer available for export
MFR: Amperex
SKU: 4CX250BT-AMP

Rebuilt using a Svetlana core.
Filament: Thoriated tungsten
Voltage: 5.0 ± 0.25 Volts
Current, at 5.0 volts: 38.5 Amps

Rebuilt * No longer available for export
MFR: ZONUM INDUSTRIES

Data Sheet

• Filament: Thoriated Tungsten
• Voltage: 5.0 ± 0.25 Volts
• Current, at 5.0 Volts: 40 Amps

New Old Stock * No longer available for export
MFR: Penta Labs
SKU: 5CX1500A-PENTA

This tube was rebuilt by Econco on an Eimac core.

Used Rebuilt * No longer available for export
MFR: Econco
SKU: 5CX1500B-P

• The RF Parts Company (SELECT) 811A is the best quality 811a tube in current production.
• Usage tests show it to be equal to the much-respected RCA, 811A and Svetlana, 811A.
• Base indexed and internal structure aligned and supported for both horizontal and vertical operation.
• Ideal for the Collins 30L1 and similar equipment where tubes mount horizontal.
• Each RF Parts Company Select tube is tested by RF Parts prior to shipment.

Six Month Limited Warranty against manufacturing defects and workmanship. Sockets in image sold seperately.

MFR: CHINA
SKU:811A-RFP-MP

• The RF Parts Company Tubes (SELECT) 811A is the best quality 811A tube in current production.
• Usage tests show it to be equal to the much-respected RCA, 811A and Svetlana, 811A.
• Base indexed and internal structure aligned and supported for both horizontal and vertical operation.
• Ideal for the Collins 30L1 and similar equipment where tubes mount horizontal.
• Each RF Parts Company Select tube is tested prior to shipment.

Six Month Limited Warranty against manufacturing defects and workmanship. Sockets in image sold seperately.

MFG: CHINA
SKU: 811A-RFP-MQ

• The RF Parts Company SELECT 811A is the best quality 811A tube in current production.
• Usage tests show it to be equal to the much-respected RCA and Svetlana 811A.
• Base indexed and internal structure aligned and supported for both horizontal and vertical operation.
• Ideal for the Collins 30L1 and similar equipment where tubes mount horizontally.
• Each tube is tested at our San Marcos, CA USA facility, prior to shipment.

Six Month Limited Warranty against manufacturing defects and workmanship.

MFG: China
SKU: 811A-RFP-M3