Description
This NOS pair 5814A tubes is made by Sylvania in USA.
This military spec 5814A is a premium quality 12AU7A tube made by Sylvania. They have long grey plates (USA tube) with copper grid posts and a halo getter with typical support construction. The 5814A is a very reliable, long life and low noise version of a 12AU7A tube which is meant for military, professional or postal purposes. The tubes are manufactured in the sixties.
The sonic properties of theSylvania 5814A are highly regarded for e.g. musical instrument amplifiers. One of the more dynamic 12AU7A’s. I refer to the threads on the web for more information. The pair combines two very strong tubes with balanced systems and a perfect tube-tube match.
This pair is thoroughly tested. Both tubes match the factory specifications extremely well. Both tubes have balanced systems. And the tubes form a perfect pair.
See test results in the section below.
Test results
Test methods and test conditions are outline on the tube testing page.
The measurement data below illustrate that the tubes are matched and internally balanced; all better that 5%.
| Valve 1
V226 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
8,8 /10 mA
1,8 /2,1 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V228 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
9,9 /9,8 mA
2,4 /2,4 mA/V OK |
= NOS / NOS
= NOS / NOS
|
(Telefunken factory specification see test page)
Summarized description
| Tube type | 5814A |
| Quantity of Tubes | One pair |
| Brand | Sylvania |
| Manufactured in | USA |
| Date code | Not readable |
| Plate Construction | Long grey plates |
| Getter Construction | Halo getter |
| Print Condition | Mediocre; see pictures |
| Box included | Original packaging (military?) |
| Equivalent tubes: | 12AU7, ECC802S, ECC82, 13D8 , CV4003, CV491, 5814 , 7730, 5963 |
| General test results | NOS |
Please read our test and shipping policy before buying also !
