Siemens CCa vs. Amperex 6922 D getter

Thanks for explaining. That's what I thought you meant, but I wanted to be
certain.

In my system, the Amperex had a SLIGHTLY softer top end, and a SLIGHTLY
more diffuse midrange than the CCA, which in comparison had the precision
of surgical steel.

Now, everyone's interpretation of these differences varies, and what I
consider to be slight, you may consider to be extensive.

Also, to me what you describe seems possibly attributable to microphonic
tubes.

Or, it could simply be due to differing perceptions.

I compared several tubes in this category in my Dodd battery preamp and found the Amperex 1960's white label and Seimens 1960's CCa's to be the two best. Between the two, I much prefer the CCa's.

In my system the CCa's have much better texture - just sound richer without giving up bass slam or top end. Dynamics are great, also.

I tried a couple pairs of both, so I got some diversity there. I do plan to keep a pair of the 7308's around to change things up once in while.

I heard the Amperex's in the Dodd and thought they were great. I use them and Siemens in my Art Audio Alana pre.

Have you tried switching left and right? With the Dodd only using half the triode in each tube, you might notice a difference if one of the sides is a little off. Cost = 0.

It does sound like it could be weak tubes though. I have an amp that was starting to sound a little flat. I changed the output tubes, no luck, changed rectifiers, no luck. It uses 6922's and 12bh7's in the driver/gain stage, replaced them, bingo. All the dynamics/transients were back and it was day and night, not audiophile split hairs different.

I think you'll like the 7308's when you get them.

My understanding is that a CCa is actually a production 6922 which tests and sounds special. Thus they are just highly selected. That said I agree that it is a scapel compared to a rip saw.
The comments on the 6SN7s are verging on inane. Of course those tubes rock and if you really want a tighter sound try Jan CHS WGTs or Black NU GT if you want bass use Ken Rad VT 231 GTs.
One of the few notable reasons for buying such prescious tubes like Ws and RPs is that they are very extended and very dynamic. Nonetheless their very high prices are now hard to justify.
There are tons of great 6SN7s with less prestige attached to them going at auction for peanuts. If you are an SN7 fan, the summer time slow selling days are a boon to people starting collections.
P.S. forget about fimding an NOS CCa or even a high quality 6922 for less than a kings ransom.

The Siemens CCa tubes are worth every penny of the +- $250 that they cost. I use them in both my Sonic Frontiers Line 3 SE+ preamp and in my Wolcott P220M amp and there is simply nothing else that comes even close.
Do an A/B comparison to anything else out there and you will change to them despite the price - they are that good.