Tung-Sol6550Tung-Sol 6550 Factory Matched Pair (Extremely Rare!)This is very rare find, once in a lifetime!Factory matched pair, very tight readings. 1958 date codes, black plates, triple mica construction. One base is slightly lighter color brown, which is com...950.00

Tung-Sol 6550 Factory Matched Pair (Extremely Rare!) [Expired]


no longer for sale

This is very rare find, once in a lifetime!
Factory matched pair, very tight readings. 
1958 date codes, black plates, triple mica construction.
One base is slightly lighter color brown, which is common in this era.

Plate current on the Maximatcher @ 400v \ -48 = 35.5mA \ 35.3mA

Hickok 600A Readings are very strong, proper test procedures for 6550 were done with care. 7000 is nominal on the Hickok

11,500 \ 11.250 Steady @ 6.3 Filament Voltage 
11,500 \ 11,250 Steady @ 5v Drop

cerecords member since October 2017

 
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