Description
Pair: ECC83 Marconi f92 long plate; made in 1959 by Mullard UK.
Description
This is a pair ECC83 double triodes that is produced for Marconi by Mullard in Blackburn UK. The tubes have a ring getter, copper grid posts and long plates (Version f92; introduced immediately after the mC-series), see pictures. Both tubes are manufactured in october 1959. The tubes are NOS !; no signs of use at all. Very healthy tubes with NOS specs and excellent matching systems; see test results.
The tubes look and measure unused; see pictures!
Sonics
The overall soundstage of Mullard ECC82 tubes is warm (warmth in the mid and lower regions) and lively with a very spacious soundstage. These tubes reproduce the human voice with impressive realism (opera!). The British-made Mullard tubes provide a mesmerizing sparkle at the top end of the spectrum coupled with rich bass. This tube type is very low-noise and therefore very suitable for pre-amplification.
This early F92 selection for Marconi ECC83 B339 takes the aforementioned properties to an even higher level; a master in reproducing life music. I refer to the many threads on the web for more information.
The special selection for Marconi is almost impossible to find nowadays and is recommended to every serious audiophile.
Summarising: Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!
Test results*
The measurement data below show that both systems are precisely matched and balanced. And fully in line with the factory specification for a NOS-tube.
| Valve 1
V300 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,2/ 1,2 mA
1,6/ 1,5 mA/V OK |
= NOS
= NOS |
| Valve 2
V301 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,3/ 1,3 mA
1,7/ 1,6 mA/V OK |
= NOS
= NOS
|
Where NOS is : Ia = 1,1 to 1,4mA, Gm= 1,3 to 1,95 mA/V.
* For test methods and factory specification read the tube testing page.
Short description
| Tube type | ECC83 |
| Quantity of Tubes | One pair |
| Brand | Marconi |
| Manufactured | Mullard Blackburn UK |
| Dates | 1959 / 1959 (codes: f92 B 9J) |
| Construction | Long ribbed plates, copper grid posts |
| Getter Construction | Halo getter |
| Print Condition | Both excellent; see pictures |
| Box included | White box |
| Equivalent tubes: | 12AX7, ECC803S, CV4004, 12AX7A, B339, 12AX7WA |
| General test results | NOS |
