EL84 Matsushita / Philips pair 1965 v17/30

85,00

Highlights

    • Excellent matched pair
    • Excellent sonics
    • Date 1966

1 in stock

Description

Here is a matched pair EL84 tubes made Matsushita in Japan.

Detailed description

This pair of EL84’s is produced by the Philips subsidiary Matsushita in Japan. The tubes have been thoroughly tested and have excellent electrical values (note test results below). Very strong tubes!  Please not that the Matsushita EL84 tubes are not provided with an etch code!

Matsushita

In 1952 Konosuke Matsushita signs a technical cooperation and licensing agreement with Philips in the Netherlands. As a result Matsushita obtained it’s tooling, tube technology and materials from Philips. A lot of Matsushita tubes look like Philips and Mullard tubes at 1st glance. It should therefore come as no surprise that Matsushita made excellent tubes. Matsushita tube production started in 1953 and ended in 1979. The circular Matsushita logo changed in about 1969 to a triangle. 

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*

The measurement data below show that the tubes test NOS and are matched. 

Valve 

V17

Ia (plate current):

Transconductance (Gm):

Gas test, Shorts test:

 48  mA

11,3  mA/V

OK

NOS

NOS

 

Valve 

V30

Ia (plate current):

Transconductance (Gm):

Gas test, Shorts test:

45  mA

11,0  mA/V

OK

NOS

NOS

 

* Please read the test notes  !

Summarized description

Tube type EL84
Quantity of Tubes One pair
Brand Matsushita
Manufactured by Takatsuki or Kyoto, Japan
Date code 5D (1965)
Plate Construction Grey plate
Getter Construction Halo getter (see pictures)
Print Condition Bad; see pictures
Box included Generic boxes
Equivalent tubes:  CV2975 6BQ5 7189 E84L
General test results  NOS 
Please study photos carefully; what you see is what you get! Ask any questions before bidding.

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