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(!!!!) (Recommended Tungsol Single) 6550 Tungsol black plate like new 1957 tarnished base (130ma) (Recommended for Audio Research power supply)

(!!!!) (Recommended Tungsol Single) 6550 Tungsol black plate like new 1957 tarnished base (130ma) (Recommended for Audio Research power supply)

$ 379.99

6550 Tungsol black plate like new (5707-3=1957) good top getter, 1st series Tungsol made

130ma

Gm=10,700

 

Tested on Amplitrex

Good Ma range = 120-140ma

Good Gm=10,000-12,000

 

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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