Other

The 833A is a vacuum tube constructed for medium power oscillator or class B or C amplifier applications. 

MFR: Penta Labs
New Old Stock * No longer available for export
Made in China
SKU: 833A-PENTA-CN

Clean Pullout out of working equipment, Tested at RF Parts test lab
Used * No longer available for export
MFR: National Union
SKU:807-NU-P

Ceramic/Glass Tetrode
HD version of 4X150D
New Old Stock * No longer available for export
MFR: Eimac
SKU: 7609

High Mu Triode (Planar)
New Old Stock * No longer available for export
MFR: Eimac
SKU: 7211

The 813 beam power tube was very popular with amateur radio operators following WW II. The tube remained a staple of amateur radio until single sideband became a popular operating mode in the late 1950's and early 1960's. Featuring a graphite plate with an ICAS dissipation rating of 125 watts the tube was very economical and a pair could provide legal limit operation (1 kilowatt input) on CW or AM. Later tubes manufactured by RCA and Amperex featured an improved plate made of zirconium-coated nickel.

Used * No longer available  for export
MFR:  RCA
SKU: 813-RCA-P

Designed to function as a industrial rectifier tube.
New Old Stock * New In Box * No Longer available for export
MFR: National Electronics
SKU: 7723
Made in USA

The 4E27 is a VHF Transmitting Pentode that is air cooled with a 7 pin ceramic dish base

MFR: Lewis Electronics * Made in USA
New Old Stock * No Longer Available for Export

SKU:4E27

Beam power amplifier tube
Manufacturers: GE, Sylvania, Westinghouse
New old stock * No longer available for export

Hydrogen Thyratron for radar modulation applications. 8KV peak, 100mA average, 90A peak anode current. Super Jumbo 4pin base with bayonet.

New Old Stock * No longer available for export
MFR: Philips
Made in Holland
SKU:4C35-Philips