ECC83 pair Philips I61, Early: same year 1960 (V100 / 128)

Description

Pristine matched pair !

Description

This is an early Philips ECC83 pair. The date code Delta 0B on the glass of the tubes indicates that they are manufactured in februari 1960 in the Philips plant in Heerlen.The tubes have grey ribbed plates and a halo getter. Both tubes are excellent condition. The tubes are thoroughly tested. The pair is matched very well and both tubes are internally balanced. The specs of the pair match the factory specifications extremely well. See test results.

The properties of the Philips ECC83 for hifi applications are legendary and widely known. I refer to the many threads on the web for more information. 

Sonics

Sonic characteristics of this ECC81 tube:

• Middle area: Particularly natural, rich and lively. Voices have a beautiful presence and a realistic timbre.
• High notes: Open, sparkling and refined. Lots of air and detail, without necessarily getting sharp.
• Layer rendering: Deep, tight and decently defined. Not overly heavy, but with a nice foundation.
• Sound image: Spatial, wide and with a good depth effect.
• Detail rendering: Strong in small nuances, instrument texture and subtle dynamic differences.
• Musicality: Fluid and natural, with a nice combination of warmth and brightness.

In summary, typical for the Philips I61 is the combination of warmth and transparency. It doesn’t have to sound overly warm to still give a very organic and lifelike music reproduction. In a good hi-fi installation the Philips I61 particularly excels because of its combination of: naturalness. a beautiful middle area. sparkling highs, spatiality and a relaxed but detailed presentation. The sound image of the I61 is very similar to that of the I63. However, the I61 sounds a bit more refined and natural

Test results

The tubes have been tested carefully with the official factory test set-up and our sophisticated test equipment. Please read our tube testing page for the ECC83 tube family. The measurement data below show that these tubes are perfectly matched to each other and are internally balanced. And meet the factory specifications of a new/NOS tube very wel. Tube to tube match and internal balance for all tubes is excellent (Gm match < 2%). 

Valve 1 V100

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

1,4/1,3 mA     1,8 /1,7 mA/V OK

=  NOS / NOS =  NOS / NOS

Valve 2 V128

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

1,4/1,3 mA     1,9 /1,8 mA/V OK

=  NOS / NOS =  NOS / NOS

Where NOS is : Ia = 1,1 to 1,4mA, Gm= 1,3 to 1,95 mA/V. 

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

Short description