Description
Pair: ECC83 made in 1959 by Mullard UK. The tubes are labeled as Philips Miniwatt
This is a pair Mullard ECC83 of the F92 series. They are produced by Mullard in Blackburn, UK. The tubes have double post halo getters, copper grid posts and long ribbed plates (F92 series), see pictures. Very healthy tubes with NOS specs! Tubes with matching systems; see test results. These tubes are famous and by many considered as one of the best 12AX7 tubes that can be acquired
The tubes look and measure unused; see pictures!
Sonics
The long plate F92 delivers warm, spacious and transparent sound. Also here I refer to the threads on the web for more information. Excellent preamp valve and very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!
Note from the web: “The overall tonality of Mullard ECC83 tubes is warm and lively with a very spacious sound stage. “Like a warm British jacket of the finest tweed, these glorious tubes have an attractive sweet warmth in their midrange and lower regions.” This is how the experts on audiotubes.com describe the sound signature of British-made Mullard tubes. The top end is silky and pleasant and doesn’t get rolled off. They retain a fine sense of “air” at the top, and the upper midrange is smooth and liquid. These tubes reproduce the human voice, especially female voices, with haunting realism. The British made Mullard tubes are also known to have an attractive sparkle at the top with rich bass…now we know where that “warm British jacket” comes from!
Note: if your system sounds to warm already, this tube is not a first choice. In that case Philips Heerlen, Telefunken or Valvo may be preferred.
Test results*
| Valve 1
V227 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,3/ 1,2 mA
1,6/ 1,5 mA/V OK |
= NOS
= NOS |
| Valve 2
V228 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,2/ 1,3 mA
1,6/ 1,3 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 | Mullard |
| Manufactured in | Blackburn UK |
| Dates | 1959 / 1959 |
| Construction | Long ribbed plates, copper grid posts |
| Getter Construction | Double post halo getter |
| Print Condition | Both excellent; see pictures |
| Box included | White box |
| Equivalent tubes: | 12AX7, ECC803S, CV4004, 12AX7A |
| General test results | NOS |
