It has been a crazy holiday season for us. Jond, you are probably confusing it with the CA200, aka little brother of the venerable Premier 350, solid state control amp that has indeed a passive preamp.
Conrad johnson cav 50 manual upgrade#
Then you could upgrade the 12AX7 / ECC83 / 7025.Īs for output tubes, JJ E34L has indeed great value/money.Īt the end of the day, the circuitry is based on the PV10 which is a good but not very resolving model like the PV12 at that time so one should not go crazy with tube rolling. I recommend the Siemens E88CC Germany if you like great vocals, other reasonably priced are Philips E88CC Holland, Philips/Mullard E88CC UK and Amperex 6922 USA (orange label). The line stage of the PV10 (w/o phono stage) was based on a single 12AU7 (one half for each channel) which can be easily upgraded to a nice ECC82, IOW, that tube has a lot of influence on the overall sound.
Conrad johnson cav 50 manual driver#
In fact, the power stage of the CAV50 (12AX7 line stage for the gain, 6SN7 dual-triode driver and E元4 in push/pull for the power) is IMO (almost) identical to the MV50. I have had most CJ tube gear, including the PV10 and MV50 and I am pretty sure the CAV50 is based on the PV10/MV55 circuitry (I talked to the tech dept before buying the CAV50 as I liked the MV50 and had it for nearly a decade). But with a solid state and my record player, it was nice. Not as good to me as the mid-to-hi-grade RBH I was comparing them to. I did try the SL6's in a solid state setup, and they sounded fine. JAZZONTHEHUDSON: What do you mean by "rolling the line stage tubes"? Do tubes degrade, and if so, should I just do a mass exchange of all the tubes? Lastly, I think these tubes are all original and probably have never been replaced, although the amp has only been used less than 100 hours during that time. Is it really going to sound different with these different tubes, and if so, should I just roll the dice, or do any of you vets have experience with all three of these recommendations and can offer me some advice. :( The local owner recommended the Mullard E元4, and I have recommendations for the Genalex Gold Lion KT-77 and the JJ E34L. I went to a local shop ( UTAH) and they said CJ is a company that doesn't give out schematics so they can't work on it and I have to send it in. If you have any more about where to proceed with the bias light, or whether I should even worry about it, all is welcome. So the tubes probably just all need to be changed, unless time doesn't affect them, and only usage. Although he has probably only had the amp on maybe 100 hours over the last 10 years. Jond: I don't think he has ever changed the tubes. Part of the reason I was thinking of selling this combo is it just doesn't sound good, but now I realize it is probably just the speakers being mismatched with a low power amp. It is interesting that when he bought this setup years ago at a high end hi-fi shop, this setup is what they recommended. TLS49, from what I have read, you are totally correct about he SL6's. Any other suggestions? I tried another speaker, a cheap one that I assume is easier to push, and it doesn't change the problem, so I am guessing it is not related to the speaker being to difficult to push, but an amp problem. It might even be that the distortion can be eliminated by having the bias all the way up and having the red light solid constantly, but I am worried this may be bad for the amp. I changed the power tubes (E元4) to the opposite sides and the problem persists. Also, if I were to sell this setup, any idea on what I might ask on pricing? Thanks. To me the amp sounds little bright with the Celstion SL6's I am using, so any warmer tubes would be nice. Next question is I searched for the E元4 tubes and of course there are a large variety of them. Is it simply a tube I need to replace to fix that problem, and if I change one tube, should I change them all. The instructions say to turn the bias down/counter clockwise, until the red light goes out. When I turned the bias up, the distortion decreased. However, I noticed that my left speaker sounded blown/distorted. I turned the bias all the way down and it still flickers.
One of the E元4 tubes in slot V7 ( a tube which can have it's bias adjusted, which I assume means the power transmitted) has it's red light constantly on. I've never owned a tube amp, so not sure if I should sell it, or keep it and pay him. Just acquired this beauty from my father in law.
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