ECC83 Siemens & Halske long plates July 1955 & June 1956 Philips reference tube (V49/50)

655,00

Highlights

  • long plates
  • test NOS 
  • June 1956 & July 1955
  • Philips reference tube
  • small O-getter

1 in stock

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Description

Pair: Philips long plates made by Siemens & Halske in München

This is a pair very early ECC83 tubes. Produced by Siemens & Halske in München Germany. They have long plates, small o-getter and copper posts.

These long plates are the most sought after ECC83 valves. Much rarer than the long plate Telefunkens. Very healthy tubes with matching systems; see test results. 

The acoustic properties of the early long plates are legendary and widely known. I refer to the many threads on the web for more information.

One tube is branded Philips Miniwatt, the other tube has no readable print. This second tube has the PH LAB etch code which means that is was a reference tube of the Philips physical lab in Heerlen.

Sonics

Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!

Electrically and Physical Matched Pair with NOS specs

Test results*

Code Ia1  (mA) Ia2  (mA) Gm  (mA/V) Gm2  (mA/V)
Tube 1 (V49) #4 mCP 1,1 1,1 1,5 1,5
Tube 2 (V50) #Y mCP 1,1 1,1 1,6 1,6

Tested for leakage and gas.

*  Where 100% is : Ia = 1,2 & Gm = 1,6.  Rating see Home Page. Test method see Category Page.

Test methods are outline on the Tube testing page, for test conditions see Category Page.

Short description

Tube type ECC83
Quantity of Tubes One pair
Make Siemens & Halske
Manufactured in München Germany
Date codes January  June 1956 & July 1955
Construction creases on the top of the bottle, copper posts
Getter Construction Small O-getter 
Print Condition poor; see pictures
Box included new white box
Equivalent tubes:  12AX7, ECC803S, 12AX7WA
General test results  NOS

Additional information

Weight 50 g
Dimensions 15 × 3 × 3 cm