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(!!!!) (Best Overall 6550 Pair) 6550 Tungsol USA gray plate NOS smooth gray plates 1963 same date codes in white boxes (136.5ma and 139.5ma) (Closely matched Ma and Gm)

(!!!!) (Best Overall 6550 Pair) 6550 Tungsol USA gray plate NOS smooth gray plates 1963 same date codes in white boxes (136.5ma and 139.5ma) (Closely matched Ma and Gm)

$ 479.99

1 pair) 6550 Tungsol USA gray plate NOS smooth gray plates 1963 same date codes in white boxes (3226340-03=1963 40th week) Three (3) large shiney getters on each tube

1 tube) 136.5ma Gm=11,650 (1963)

1 tube) 139.5ma Gm=11,550 (1963)

 

 

Good NOS Ma range 125-140ma

Good NOS Gm range 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

 

See more: vacuum tube
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