I have owned my CA50 for the last 3 or so years and I am very happy with the amp. I currently use it full range driving fairly high efficiency speakers and a pair of add-on ribbon tweeters and the sound is very neutral.
You perhaps should have checked here or any of the other audio boards before getting upset as it is fairly common knowledge the CA 50 is not a good candidate for tube rolling.
I tried both JJ 6922's, Amperex Orange Globe and Bugle Boy 6DJ8's and it ate all in short order. The JJ's (which are nice warm sounding tubes in most amps) actually shorted and damaged the Amp while the Amperex's merely became noisy. This gets expensive in short order. Audio Research and Audible Illusions really stress the 6DJ8/6922's in their products and the Sovetek, Electro Harmonix and some versions of the NOS 6h23 (the 6h23EB I believe but you should check)are all that will last long term in the amp. See Jim McShanes website for his take on the subject. The EH69222's that ended up replacing the original Soveteks are not bad with a smoother less strident sound. I have heard that 7308's may work and I have some Valvo's and Tunsgrams I may try when I get brave (and perhaps foolish).
On the other hand the CA50 seems to tolerate different output tubes with just the normal re-biasing. Currently I am using the Tungsol 6550 Re-Issues with good results.
You perhaps should have checked here or any of the other audio boards before getting upset as it is fairly common knowledge the CA 50 is not a good candidate for tube rolling.
I tried both JJ 6922's, Amperex Orange Globe and Bugle Boy 6DJ8's and it ate all in short order. The JJ's (which are nice warm sounding tubes in most amps) actually shorted and damaged the Amp while the Amperex's merely became noisy. This gets expensive in short order. Audio Research and Audible Illusions really stress the 6DJ8/6922's in their products and the Sovetek, Electro Harmonix and some versions of the NOS 6h23 (the 6h23EB I believe but you should check)are all that will last long term in the amp. See Jim McShanes website for his take on the subject. The EH69222's that ended up replacing the original Soveteks are not bad with a smoother less strident sound. I have heard that 7308's may work and I have some Valvo's and Tunsgrams I may try when I get brave (and perhaps foolish).
On the other hand the CA50 seems to tolerate different output tubes with just the normal re-biasing. Currently I am using the Tungsol 6550 Re-Issues with good results.