Description
Tung-Sol 6SN7GTB USED USA STOCK
This is a pair of used Tung-Sol 6SN7GTB tubes made in USA. The properties of this tube are widely known. I refer to the many threads on the web for more information. The tubes are thoroughly tested and it have good electrical values (note test results below).
Very nice pair. Many prefer this tall body version.
Sonics
Excellent preamp valve, super linear, low noise, very smooth extended highs, very good in phono stages.
> one of the best vintage 6SN7 types.
Factory Specification
See data sheets (last pictures)
Test method & results
Tested with: AVO CT-160 (Dutch army tester), AVO Valve Data Manual 23rd edition 1981, Utracer3+, Philips 1532, RFT stabilized power supply, 2x Korad KA3005P programmable power supply and 2x Keithley 2700.
Gas and shorts tested with: AVO CT-160 (Dutch army tester) Setup: AVO Valve Data Manual 23rd edition 1981.
Ia & mu are tested with the official factory test setup: Va = 250V and Vg = – 8V. Precision test voltage ± 3%. Measurement after 10 minutes stabilization.
Test results*
| Valve 1
V14 |
Ia (anode current):
Transconductance (Gm): Gas test, Shorts test: Balance |
7,5/ 7,2
2,1/2,1 mA/V OK Platimum grade |
= Good
= Good
< 5% |
| Valve 2
V17 |
Mu (amplification):
Transconductance (Gm): Gas test, Shorts test: Balance |
8,0/ 8,1
2,5/ 2,5 mA/V OK Platimum grade |
= Strong
= NOS
< 5% |
(Ia good is 5 mA. new is: 9 mA, Gm: New is 2,5 – 2,7 mA/v)
* For test methods and factory specification read the tube testing page.
Short description
| Tube type | 6SN7 GTB |
| Quantity of Tubes | One pair |
| Brand | Tung-Sol |
| Manufactured in | USA |
| Dates | codes 32DP3 & 322HB3 > late fifties |
| Construction | typical Tung-Sol plate structure |
| Getter Construction | D-getter |
| Print Condition | excellent; see pictures |
| Box included | Generic white box |
| Equivalent tubes: | 6SN7, 5692 |
| General test results | Excellent specs |
