Description
Philips Heerlen Holland production !
This is a early pair ECC83 produced by Philips in1960 in Heerlen Holland (version I62). The tubes bear the Philips Miniwatt print. The tube has a large ring getter on ‘silver’ post and ribbed grey plates, see pictures. Matched tubes with balanced systems; see test results.
Sonics
The Heerlen ECC83 double triode’s most distinctive sonic feature, like that of many Heerlen double triodes, is its transparent, natural and sparkling midrange presentation, with a light touch of warmth illuminating your music. The sound image is spacious and deep, structured. The bass is deep but well controlled. I refer to the many threads on the web for more information. Excellent preamp valve and because of the low noise level, very suitable in phono stages. These ECC83 tubes fulfill the previous description without doubt.
Note: if your system is “bright sounding’ or to “bright/harsh” already, this tube is not a first choice. British made ECC83 tubes or Telefunken are to be considered in that situation.
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 shows that these tubes are matched to each other and are internally balanced. And meet the factory specifications of a new/NOS tube.
| Valve 1
V330 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,2 / 1,2 mA
1,6 /1,5 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V331 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,2 / 1,3 mA
1,9 /1,8 mA/V OK |
= NOS / NOS
= NOS / NOS
|
Where NOS is : Ia = 8,7 to 12,5mA, Gm= 1,9 to 2,7 mA/V. Ia = 10,6 ± 1,9 mA. (Telefunken factory specification see test page)
Short description
| Tube type | ECC83 (I62) |
| Quantity of Tubes | One pair |
| Brand | Philips Miniwatt |
| Manufactured in | Heerlen Holland UK |
| Dates | 1960 ( I62 Delta 0C4 & I62 Delta 0C) |
| Construction | Ribbed grey plates |
| Getter Construction | Halo getter on ‘silver‘ post |
| Print Condition | Nice; see pictures |
| Box included | Generic Philips Miniwatt box |
| Equivalent tubes: | 12AX7, ECC803S, CV4004, 12AX7WA, E83CC |
| General test results | NOS |
