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Problems with Siemens CCa 6922 tubes?

I have used three different sets of Siemens CCa tubes in my amplifier, and all have started to fizzle, crackle and/or pop within a few weeks. Just curious if others have had this problem? My dilemma is that I LOVE the sound of these tubes, and everything else I've tried in this amp (Amperex, Ediswan, Siemens non-CCa, Sovtek, and a couple others) does not sound nearly as good.

Thanks for your feedback and/or suggestions for alternative tubes.
boa2

Showing 3 responses by albertporter

albertporter's avatar
albertporter
4,949 posts
 
You did not mention what the amplifier is.

A few years ago I owned a prominent name brand amplifier that used 6922 tubes and after destroying several NOS Telefunkens and Amperex tubes, discovered the bias was in error by 300%.

Might check yours. Other option already mentioned that these could be faulty to begin with. Either way, something is beyond the norm.
albertporter's avatar
albertporter
4,949 posts
 
Boa2.

You might try the Siemens E288CC. It's similar tonal balance, transparency and dynamics to the CCa but tougher to kill. I have had excellent luck with it in some circuits and not so great in others.

Aesthetix Io and Callisto neither one like the E288CC but one amp performed its best with them and a borrowed preamp responded very well too.

I could possibly loan you a couple. Is two what you need?

I loved them so much I bought a box of 50 NOS. If you don't like them you could just return them. If you do like them I know of a source with fair pricing.
albertporter's avatar
albertporter
4,949 posts
 
Dekay is correct about the E288CC not being a direct sub. I have tried it in several circuits in place of 6922 with no problems but the suggestion to check with Audion is a good one.

If they say it won't damage the circuit, you have nothing to loose by giving them a try. Let me know via email if you want me to ship to you.
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