EL84 Philips rare D-getter pair dates 1956/1957 v18/v28

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