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The 6550B is an early Svetlana variant of the 6550 made in the 80's.

New In Box * No longer available for export
MFR: Svetlana Electron Devices, Inc.
Made in Russia
SKU: SV6550B-3

Radial Beam Power Tetrode Transmitting Tube
New Old Stock
MFR: Eimac
SKU: 4X150-JAN-7034

NOTE: The photo is for reference only.

• Similar to SK606 & 124-111

Used
MFR: Generic
SKU: GENERIC-SK606/124-111-P
Note: Image for reference only.

• Similar to SK606

Used
MFR: E.F. Johnson
SKU: 124-111-P
Note: Image for reference only.

The Svetlana™ 6550C is a glass envelope beam power pentode. It is intended for ultra linear audio frequency power amplification service. Close manufacturing specification tolerances and improved processing provide improved reliability and superior sonic performance.

New In Box * No longer available for export
MFR: Svetlana Electron Devices, Inc.
Made in Russia
SKU: SV6550C-MQ

• Size: 1-1/8" long x 5/8" wide x 7/16" High
• Internal  Diameter: 3/8"
• Tested and verified

Used
MFR: Millen Manufacturing Company
SKU: PLCAP2-MILLEN-P

New Old Stock * New In the Box 
MFR: Sylvania
Made In Great Britain
SKU: 6KG6A-EL509-SYL-MP

New Old Stock * New In the Box 
MFR: Sylvania
Made In Great Britain
SKU: 6KG6A-EL509-SYL

New Old Stock * New In the Box 
MFR: RCA
Made In Great Britain
SKU: 6KG6A-EL509-RCA