Difference between Siemens CCa & 7308

The only Siemens CCa to own is the grey riser version from the late 50s through mid 60s. Period. Big air, big soundstage, deep and tight bass, and wide image.

Otherwise, one might as well buy Siemens E188CC (7308) or E88CC (6922), which are excellent in their own right, and less expensive than CCa versions with shiny risers or thin getter supports.

An often overlooked Siemens and Halske Tube is the 1960's vintage ECC88/6DJ8. Extremely rare to test one that is not tightly matched between triodes. Just as rare for this tube to be microphonic and even the slight bit noisy. To top it off, no slouch at resolving low level detail, extended on top and bottom. My first choice for sensitive gain stage use in pre-amps.

>>11-05-07: Anacrusis
A food critic can tell me what spinach tastes like. Sound has much more definable characteristics. Airy, detailed, dimensional says it nicely.<<

Those are nice words. Unfortunately, there are no universal and accepted meanings for them. I suspect most listeners have their own personal definition of them based on the equipment they've heard.

I hope that helps and BTW, eat your spinach.