charles
Active member
When these original E88CC valves were produced it was mainly used in in receivers, telegraph, medical instruments and computer applications. It was not extensively used in audio equipment as today. Major manufacturers were for example: Siemens, Telefunken, Philips, Mullard and others.
As these valve were used mostly in an industrial environment it had excellent specifications. It was a Special Quality valve with a long life expectancy in the order of 10 000 hours, tight specifications, reliability and others. The E88CC is also a low noise double triode (refer to Siemens data manual).
There is an even higher Special Quality E88CC one, the CCa valve.
An interesting one is the E188CC that have tighter specifications than the E88CC valve. Except from being a low noise double triode is also non microphonic (refer to Siemens data manual). It was made for audio applications.
Then many years later the E88CC was used in audio applications because of its excellent specifications.
When stocks of the original E88CC/6922 became depleted, modern valve producers start producing the “E88CC” valve. It does not have the Special Qualities such as long life and other specifications of the original ones.
Today the original ones are becoming scarce and expensive.
As these valve were used mostly in an industrial environment it had excellent specifications. It was a Special Quality valve with a long life expectancy in the order of 10 000 hours, tight specifications, reliability and others. The E88CC is also a low noise double triode (refer to Siemens data manual).
There is an even higher Special Quality E88CC one, the CCa valve.
An interesting one is the E188CC that have tighter specifications than the E88CC valve. Except from being a low noise double triode is also non microphonic (refer to Siemens data manual). It was made for audio applications.
Then many years later the E88CC was used in audio applications because of its excellent specifications.
When stocks of the original E88CC/6922 became depleted, modern valve producers start producing the “E88CC” valve. It does not have the Special Qualities such as long life and other specifications of the original ones.
Today the original ones are becoming scarce and expensive.
