E288CC / 8223 Siemens Gold Pin
E288CC / 8223 Siemens Gold Pin
The E288CC / 8223 are absolute top sounding special quality tubes. They are not exactly the same as the E88CC / 6922. They require a little more heater current (0.475A against 0.3A) which the amps power supply has to deliver.
Also they have slightly different amplification and plate impedance, but this is not problem in common E88CC circuits.
No matching possible due to very limited availability
Recommendation for matched/balanced pairs: MULLARD E188CC
Printing may be different due to availability of stock.
