Beschrijving
Description
This is a pair ECC83 produced by Mullard in the sixties in Blackburn the UK. The tubes have ring getter, copper grid posts and ribbed plates (Version I61), see pictures. Very healthy tubes with NOS specs! Tubes with matching systems; see test results.
Sonics
The first short plate Mullard ECC83 is highly regarded for its great mid range and solid bass. It can be described as warm smooth and rich. I refer to the many threads on the web for more information. Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!
Note: if your system is to “warm”, this tube is not a first choice. ECC83 tubes of Mullard, Brimar or Telefunken are to be considered in that situation.
Please read our test notes and shipping policy before buying !
Test results*
The measurement data below show that both tubes are precisely matched and balanced. And fully in line with the factory specification for a NOS-tube.
| Valve 1
V249 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,1 / 1,2 mA
1,6 / 1,7 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V383 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,1 / 1,2 mA
1,6 / 1,8 mA/V OK |
= NOS / NOS
= 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 | Pair |
| Brand | Mullard |
| Manufactured in | Blackburn, UK |
| Date codes | I61 B2L1 / I61 B2K4 (1962 /1962) |
| Construction | Ribbed plates, copper grid posts |
| Getter Construction | Halo getter on ‘copper’ post |
| Print Condition | Excellent; see pictures |
| Box included | Generic boxes |
| Equivalent tubes: | 12AX7, ECC803S, CV4004, 12AX7A, B339 |
| General test results | NOS |
