HammondWiki - Diff: 6550

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Newer page: version 2 Last edited on August 31, 2006 3:20 pm. by JeffDairiki
Older page: version 1 Last edited on August 31, 2006 3:10 pm. by JeffDairiki
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+The 6550 is the output tube used in Leslie model [122|Leslie122], [147|Leslie147]  
+and various other amplifiers. (Actually, they're used in pairs.)  
+  
+For pictures of the guts of one, see http://www.dominik-termeer.de/6550.html.  
+  
+The 6550 tube was developed by Tung-Sol Electric, Inc. as a high-output audio tube in the mid-1950's. 6550's might be found in Leslie amps with the Leslie private-label brand applied but they can be identified as Tung Sols by the EIA (Electronic Industries Association) manufacturer's code "322." _NewOldStock_ ("NOS") Tung-Sol 6550s are widely sought-after and command high prices.  
+  
+A variant of the tube, the 6550A, was developed by G-E. The G-E tubes can be differentiated from the Tung Sol tubes by shape: The G-E tubes have a straight-sided glass envelope; Tung-Sols have the cooler-looking "shouldered" or "Coke-bottle" envelope.  
+  
+6550 tubes are no longer manufactured in the US, but are still being produced in Russian factories.  

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