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(!!!!!) (Best Overall Single) 6550 Tungsol black plate NOS branded Sylvania late 1950's (135ma) (Recommended for Audio Research power supply)

(!!!!!) (Best Overall Single) 6550 Tungsol black plate NOS branded Sylvania late 1950's (135ma) (Recommended for Audio Research power supply)

$ 479.99

6550 Tungsol black plate NOS branded Sylvania "D" getter halo - large shiney top and side getter in Sylvania box - very good condition

135ma

Gm=10,300

 

Tested on Amplitrex

Good Ma range = 125-140ma

Good Gm=10,000-11,000

 

Recommended for

- ARC VS 110 and other ARC amps
- Audio Research Reference 3 line-stage power supply 
- Rogue 90
- VTL amps; MB300, 450, many others
- Gibson guitar amp
- McIntosh 275
- Beard P100 MKII 1984
- Cayin A-88T

 

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