Description
Sylvania 5751 closed disk version.
This pair of Sylvania 5751 tubes are made in the USA. The 5751 is a low noise version of the E83CC; equivalent to the ECC803S. The tubes have a closed disk getter. The tubes have excellent test values that match the factory specifications very well and balanced systems. Although the print on the tubes has faded away, they look and measure new and unused.
Sound Characteristics
Very transparent and open with impressive speed and excellent high end extension, accurate solid bass . These are extremely low-noise tubes.
Test method & results
The tubes have been tested carefully with the official Telefunken test set-up and our sophisticated test equipment. Please read our testmethod for the ECC83 tube family. The measurement data below show that both tubes are matched and balanced. And fulfill the factory specs of a new/NOS (E83CC) tube.
| Valve 1
V137 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,5 / 1,6 mA
1,4 / 1,5 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V138 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,4 / 1,4 mA
1,4 / 1,4 mA/V OK |
= NOS / NOS
= NOS / NOS
|
(Telefunken factory specification see test page)
Summarized description
Tube code: 5751
Actual Brand*: Siemens & Halske
Printed Brand: Sylvania
Manufactured in: USA
Production date: Sixties
Plate Construction: Grey plates
Getter Construction: Solid disk halo getter
Print Condition: Nice; see pictures
Box included: Generic white boxes
Equivalent tubes: E83CC, ECC803S, 12AX7, ECC83, 12AX7WA
General test results: NOS specs
Quantity of Tubes: 2; one pair
