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Siemens CCa vs. Amperex 6922 D getter

I have a Audio Note P3 Silver with a Dodd battery pre amp. The Dodd calls for a 6922.

The Amperex WL GP PQ D getter in comparison to the CCa in my set up sounds dazed and confused. It is like a dirty window that needs cleaning when I insert the CCa.

I had the Amperex three weeks before the CCa came on the scene. When I first put the CCa in the music seemed to jump out of the speakers with such clairity that I was shocked that the Amperex somehow lost all that info.

So much for MR. Joe's report on the 6922. In my system they rock. I must say they work better with the TS 6SN7 RP than the Sylvania W metal. YMMV.

Anyone else have this experence?
128x128glory
Post removed 
jerrym303
54 posts
 
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.
onemug
784 posts
 
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.
mechans
3,048 posts
 
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.
msallen
18 posts
 
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.
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