Beschrijving
The original 6AS7G designed and developed by RCA in 1946 and produced in 1953; it’s hard to beat the original legend!
This is a beautiful matched pair of NOS/NIB 6AS7G tubes.They are made by RCA and were packed by the AC spark plug division of Ford in Flint, USA. These tubes are made in the first production year !! For the Joined Army and Navy in 1953 and packed in 1953 as well. In the box they are carefully wrapped in a cotton non woven envelope. See pictures
The 6AS7G is a double triode with special properties. The AC anode resistance is very low at 280 Ohms and the mutual conductance is considerable at 7 mA/V. This valve can be used in low voltage power supplies as a series pass device or it could be used for a direct drive audio amplifier. The literature mentions a single ended audio amplifier as its use. The earliest reference of this tube was in the 1950 RCA data book.
This version of the 6AS7G is highly regarded for use in OTL amplifiers (e.g. Atma-Sphere) and headphone amplifiers. I refer to the threads on the web for more information.
I had the opportunity to obtain a number of these tubes and this enabled me to select a nice matched pair. The tubes have a coke bottle shape, black plates and two top D-getters with a beautiful flash.The tubes are thoroughly tested. Both tubes have excellent test values that match the factory specification well and balanced systems.
Sonics
Note from the WEB: All highs, mids and lows in perfect balance and a rich creamy presentation and mid-range! Big clean and clear bold sound. Sweet and creamy at the same time.
Note: my tubes are often not the cheapest. But is hard to find better tubes !
Test equipment & method
Test equipment: AVO Mk IV, Utracer 3+, Philips 1532, RFT stabilised power supply, 2x Korad KA3005P programmable power supply and 2x Keithley 2700 and AVO Valve Data Manual 23rd edition 1981.
Gas and shorts were tested with: AVO Mk IV. Ia & transconductance are measured conform the official factory specification (see picture) with a cathode resistor (metal film). Precision of the test voltage is: ± 1%. Measurement after 10 minutes stabilization.
Test results*
| Valve 1
V43 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
116 /116 mA
7,2 /7,0 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V45 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
119 /116 mA
7,0 /7,0 mA/V OK |
= NOS / NOS
= NOS / NOS
|
(Ia: New is 125 mA. Gm: New is 7 mA/V) A valve is assumed to have NOS specs if both; emission and Gm are 90% of the rated value or more.
Please read our test notes and shipping policy before buying !
Short description
| Tube type | 6AS7G |
| Quantity of Tubes | One pair |
| Brand | RCA |
| Manufactured in | USA |
| Date codes | 3-17 (1953 week 17) Packed: July1953 |
| Construction | Black plates |
| Getter Construction | Two top D-getters |
| Print Condition | NEW, See pictures |
| Box included | Original JAN box (see pictures) |
| Equivalent tubes: | 6080, ECC230, 6AS7GA |
| General test results | NOS |
