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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
tvad
9,467 posts
 
Have you purchased the CCa tubes from the same source? They sound like something other than the "real deal", if you know what I mean.
albertporter's avatar
albertporter
4,927 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.
boa2's avatar
boa2 OP
1,550 posts
 
Thank you both for the feedback. My amp is an Audion Silver Night MKII, a 7W SET amp. I've purchased the Siemens from two different sources, and the second source that I've used is honoring the warranty and replacing the tubes.

This amp is self-biasing, Albert. It has a single line input and a volume attenuator knob--a pseudo integrated, I guess you might call it.

I'm sending this current pair back today, and switching back to the stock tubes (Edicron...YAWN!) until I get the replacement pair of CCa's.

I should note that the fizzle/crackle of the tubes would probably not be so noticeable if I was using a less efficient speaker (our Klipsch La Scala's are 104dB), but we love them too much to switch. I just wish I could find some reliable tubes that I love as much as the CCa's.
Thank you both again,
Howard
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