Description
Here is a matched pair of ultra rare EL84 D-getter tubes made by Philips in Sittart, Netherlands.
Detailed description
Here is a pair of Philips EL84 produced in the 50’s in the Philips factory in Sittart, Netherlands. The tubes were thoroughly tested and have excellent electrical values (note test results below). Very strong tubes! Please not that the earliest EL84 type rX3 of 1956 is not equipped with the cooling vins (see pictures)!
These D-GETTER Philips EL84 tubes are loves for their warm realistic sound and considered as one the best sounding EL84.
Test method
Mutual transconductance, plate current, gas and shorts tested with: AVO CT-160 (Dutch army tester), Utracer3+, Philips 1532, RFT stabilised power supply and 2x Keithley 2700. Test conditions: Anode 250V, Screen 250V, Grid -7.3V, Filament 6,3V, Rated Ia = 48mA, Gm = 11,3 mA/V. AVO Valve Data Manual 23rd edition 1981 Before testing they were burned in for 48 hours.
Test results*
| Valve 1
V18 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
48 mA
11,3 mA/V OK |
= NOS
= NOS
|
| Valve 2
V28 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
46 mA
11,0 mA/V OK |
= NOS
= NOS
|
* Please have a look at the test notes !
Summarized description
| Tube type | EL84 | |||
| Quantity of Tubes | One pair | |||
| Brand | Philips | |||
| Manufactured by | Sittart, Netherlands | |||
| Date code | rX3 X 6L rX3 X 7D (1956 & 1957) | |||
| Plate Construction | Grey plate | |||
| Getter Construction | D getter (see pictures) | |||
| Print Condition | Bad; see pictures | |||
| Box included | Generic boxes | |||
| Equivalent tubes: | CV2975 6BQ5 7189 E84L | |||
| General test results | NOS |
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