ECC81 Valvo, D-getter, 1955, rounded plates (V35)

Beschrijving

Early version of the Valvo ECC81 with a D-getter.

This ECC81 is produced May 1955 in the Hamburg Germany Valvo factories. The tube has a D-getter and a rounded half box plate structure, see pictures. This is the sought after ECC81-type Valvo with the astonashing realistic sound image. Date code between the pins.

Sonics

Note from the web about Valvo ECC81 from the fifties: This tube is characterized by an impressive open “air” at the top end. The soundstage is large. The midrange is flat, and the bass is Impressively tight and accurate. These tubes have a fine sense of dynamics, and most are impressively quiet.  I tend to think of them as accurate, and their clean, focused sonic image is astonishing. These are not “very warm sounding” tubes, and to some ears their lower of midrange warmth may be interpreted as transparent/bright.

Test results*

The tube looks unused and has NOS test values. The internal balance between the triode sections is good. The measurement data below illustrate that the tube is in excellent condition. 

Valve V16

Ia (plate current): Transconductance (Gm): Gas test, Shorts test:

8,8 / 9,4  mA     5,0 /5,0 mA/V OK

=  NOS / NOS =  NOS / NOS

Where NOS is : Ia = 7 to 14 mA, Gm= 4,5 to 6,5 mA/V. 

  *  For test methods and factory specification read the tube testing page.

Short description