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SYLVANIA NOS 6SN7-GTB Perfect Platinum Matched Pair Tubes
SYLVANIA NOS 6SN7-GTB Perfect Platinum Matched Pair Tubes
 
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SYLVANIA NOS 6SN7-GTB

Perfect Platinum Matched Pair Tubes

Triangular Black Plates

ACTUAL PICTURES & TEST MEASUREMENTS OF THE TUBES YOU WILL RECEIVE

Superior TRIANGLULAR-BLACK-PLATE designed for critical industrial applications where 10,000 hour life, close triode section balance, rigid construction and stability are required.  

- Cary 805M amps

- Cary 300 SEI

- Mastersound 845 monoblock 2008

- Audio Note M2 preamp

- Aesthetix

10,000 hour low noise Matching Platinum Pair for a 6SN7GTB

ACTUAL PICTURES OF THE TUBES YOU WILL RECEIVE

Rarely do you see such a fine NOS tube pair with Perfect Specifications:

How to read this LCD:
This is side 1 of tube # 1. The factory 100% spec is 9.0 mA and this side tests 10.8 mA or 120%.
The GM or mA/V 100% factory spec  is 2.60 mA/V (2,600) and this side tests 3.40 mA/V or 130%
The H-to-K ( which stands for Heater-to-Cathode Leakage)on the top right corner is zero (0) uA Perfect!


You never want a tube with ANY H-to-K Leakage. The mA Gas is normal in a POWER tube, these insignificant micro-gasses burn off anyway during "break-in" which is 56 to 96 hours. THESE ARE 10,000 RATED HOUR TUBES.

YOU SELECT PAIR # 1 or PAIR # 2 or THE QUAD!

Tube # 1: 10.8mA/10.4mA and 3,400/3,400 GM 130%/130% = >100%) (AVAILABLE)

Tube # 2: 9.5mA/10.2mA and 3,400/3,400 GM 130%/130% = >100%) (AVAILABLE)

SELECT ONE (1) FOR A PAIR or BID TWO (2) FOR THE PERFECT QUAD! ...

Tube # 3: 9.6mA/9.7mA and 3,400/3,400 GM 130%/130% = >100%) (AVAILABLE)

Tube # 4: 9.5mA/9.6mA and 3,400/3,400 GM 130%/130% = >100%) (AVAILABLE)

SELECT ONE (1) FOR A PAIR or BID TWO (2) FOR THE PERFECT QUAD! ...

100% FACTORY SPECIFICATIONS: 9.0mA and 2.600 GM (2.60mA/V) = 100%

Great 1950's USA tube now extinct in NOS or NOS condition! Made specifically for audio in the 1950's in USA!

ACTUAL PICTURES AND TEST MEASUREMENTS OF THE TUBES YOU WILL RECEIVE

COMES IN THE ORIGINAL WHITE BOXES AS DISPLAYED IN THE LAST PHOTOGRAPH

COLOR BOXES NOT INCLUDED AND DISPLAYED FOR HISTORIC REPRESENTATION ONLY!

Superior designed for critical industrial applications where 10,000 hour life, close triode section balance, rigid construction and stability are required.  6SN7GTB BLACK-PLATES were also labelled and synonymous to VT-231

Great USA tube soon to be extinct in NOS!

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