Description
Telefunken ECC88 twin triodes, made by the Telefunken works, Ulm, Germany.
These tubes have a grey shield and declined getter support. Both tubes are manufactured in 1965 (April 12). Long life version of a ECC88 tube. One of the finest E88CC; spacious, neural and very detailed sound image. I refer to the web for more information.
The tubes are thoroughly tested. The matched pair has excellent test values that match the factory specifications very well and and both tubes have balanced systems. See test results below.
Test results
The measurement data below illustrate that the tubes are matched and internally balanced.
| Valve 1
V167 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
15,7 /15,4 mA
13,4 /13,4 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V366 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
15,3 /14,5 mA
13,7 /13,3 mA/V OK |
= NOS / NOS
= NOS / NOS
|
Test methods and reference values are outline on the Tube testing page.
Summarized description
| Tube type | ECC88 |
| Quantity of Tubes | One pair |
| Brand | Telefunken |
| Manufactured in | Ulm, Germany |
| Date code | Both U210543m |
| Plate Construction | Frame grid with grey shield |
| Getter Construction | Inclined getter support |
| Print Condition | Nice; see pictures |
| Box included | Generic Telefunken boxes |
| Equivalent tubes: | CCa 6922 E88CC |
| General test results | NOS |
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