ECC81 Siemens & Halske, Valvo label, same date code V32/33

Beschrijving

Pair Valvo ECC81  made by Siemens & Halske in 1967

This is a pair ECC81 produced by Siemens & Halske in Munich. The tubes are pulls from unused military stock; that’s why they were dusty. The date codes VF1 # 7J are clearly visible and indicate October 1967 as production date.  Very healthy tubes with good specs; see test results.

This ECC81 has a small halo getter and a 1-hole plate.

Sonics

The tube type is highly regarded; I refer to the few threads on the web for more information. Excellent valve for the preamp section; low noise, very smooth extended highs. Balanced and smooth sounding, recommended!

Test results

Both tubes test NOS. The internal balance between the triode sections is better than 3%. The tubes are matched all differences are smaller than 5%.

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

Valve 1 V32	Ia (plate current): Transconductance (Gm): Gas test, Shorts test:	8,9/ 8,5 mA       5,1/ 5,0  mA/V OK	=  NOS =  NOS
Valve 2 V33	Ia (plate current): Transconductance (Gm): Gas test, Shorts test:	8,4/ 8,4 mA 4,6/ 4,7  mA/V OK	= NOS = NOS

Short description