I'm second-guessing the phono stage in my Classe' 47.5 preamp and thought it might be nice to try a seperate phono stage. Tubes this time.
I've found a lot of quick plans for phono stages integrated to a preamp, but is there a simple design for a medium-output (.4mv) MC tube phono stage?
I've built a set of speakers or two, but never any electronics. That's why I'm looking for simple.
Thanks in advance...
I've found a lot of quick plans for phono stages integrated to a preamp, but is there a simple design for a medium-output (.4mv) MC tube phono stage?
I've built a set of speakers or two, but never any electronics. That's why I'm looking for simple.
Thanks in advance...
Hi,
0.4mV is closer to low output than medium output. One option might be building a kit, like those from Bottlehead, Hagerman, or K&K Audio, and then adding a stepup transformer at the input. I agree with EC8010. I wouldn't recommend scratch building a phono stage as a first tube project - hence, the kits above, where someone else has spent all the effort on layout and chasing down noise issues.
0.4mV is closer to low output than medium output. One option might be building a kit, like those from Bottlehead, Hagerman, or K&K Audio, and then adding a stepup transformer at the input. I agree with EC8010. I wouldn't recommend scratch building a phono stage as a first tube project - hence, the kits above, where someone else has spent all the effort on layout and chasing down noise issues.
addresses to the companies I mentioned above
http://members.aol.com/_ht_a/kevinc927/myhomepage/business.html?mtbrand=AOL_US
http://www.hagtech.com/
http://www.bottlehead.com/et/adobespc/Seduction/seduction.htm
http://members.aol.com/_ht_a/kevinc927/myhomepage/business.html?mtbrand=AOL_US
http://www.hagtech.com/
http://www.bottlehead.com/et/adobespc/Seduction/seduction.htm
I like pedroskova's suggestions, and in the order listed. The K&K is the most expensive but it already has input step up transformers for the low output voltage of your cart, where the Hagerman Cornet, or the Seduction need them added in. A decent pair of transformers would be ~$150.
But any of the three would be a great phono pre for you.
But any of the three would be a great phono pre for you.
pedroskova said:Wow, that was quick.
I'm jealous.
Look forward to your opinion.
Yeah, I don't F--- around with stuff like this... I read the reviews and can tell that it'll do what I want. The kicker was when I talked to Kevin on the phone. I can tell when I'm dealing with someone that knows what they are talking about.
Hi,
While I understand your decision making process very well, to me that's still a hybrid circuit and it would be nice if it was marketed as such.
Don't get me wrong, but as a tube lover the mere fact that a JFET? is my first amplification stage ( cascode no less) in the chain throws me off to the point that I'm beyond caring what's used after that, tubes or semis, whatever.
But that's just me, I only like thoroughbreds...
Let us know what it sounds like...and don't bite my head of.
Happy listening,
While I understand your decision making process very well, to me that's still a hybrid circuit and it would be nice if it was marketed as such.
Don't get me wrong, but as a tube lover the mere fact that a JFET? is my first amplification stage ( cascode no less) in the chain throws me off to the point that I'm beyond caring what's used after that, tubes or semis, whatever.
But that's just me, I only like thoroughbreds...
Let us know what it sounds like...and don't bite my head of.
Happy listening,
fdegrove said:
Don't get me wrong, but as a tube lover the mere fact that a JFET? is my first amplification stage ( cascode no less) in the chain throws me off to the point that I'm beyond caring what's used after that, tubes or semis, whatever.
But that's just me, I only like thoroughbreds...
Let us know what it sounds like...and don't bite my head of.
Happy listening,
Aw, c'mon Frank, give him a break - it's very similar to Alan Wright's design, with the addition of an x-frmr input and an x-frmr output replacing the cathode follower.
It's easily the best kit design out there...or am I missing something?
fdegrove said:
Well...as a matter of fact. this is what I'm getting ready to build...
http://members.aol.com/sbench101/Preamps/RIAA5.gif
...same idea, all tube, but it isn't a kit.
BTW, you're up awfully late...
fdegrove said:
I don't see where it's marketed as a tube only stage. A generic schematic is on the website.
Don't get me wrong, but as a tube lover the mere fact that a JFET? is my first amplification stage ( cascode no less) in the chain throws me off to the point that I'm beyond caring what's used after that, tubes or semis, whatever.
But that's just me, I only like thoroughbreds...
Thoroughbred my ****. This topology works exceptionally well.
fdegrove said:
Go ahead. Bet you can't get the noise/distortion/gain anywhere near it in a tube only design.
Hi,
Let Frank tell you something; from many years of experience; Frank makes mistakes like anyone else but when it comes to valves he knows one thing for sure: stay away from semi-conductors in the signal path.
He smells those rats miles away; they're the first thing to die in a circuit and always carry a sonic fingerprint that has no bearing to anything remotely related to music...can't say that about most valves I know of.
Frank also knows valves, he shifted enough of those to know them well enough, he also stuck his nose into recording studios, industrial apps using valves to know they're rather reliable things.
Frank also ran/runs several consultancies and is supposed to know more than his contractees...
Frank was also one of the first to implement a CCS long before anyone else "discovered" the potential...
Should Frank go on listing a lifetime commitment to audio?
Frank does respect younger coot Brett though, whishing him all the best in his new (ad)venture....
So, what about that phono stage?
Cheers,
Let Frank tell you something; from many years of experience; Frank makes mistakes like anyone else but when it comes to valves he knows one thing for sure: stay away from semi-conductors in the signal path.
He smells those rats miles away; they're the first thing to die in a circuit and always carry a sonic fingerprint that has no bearing to anything remotely related to music...can't say that about most valves I know of.
Frank also knows valves, he shifted enough of those to know them well enough, he also stuck his nose into recording studios, industrial apps using valves to know they're rather reliable things.
Frank also ran/runs several consultancies and is supposed to know more than his contractees...
Frank was also one of the first to implement a CCS long before anyone else "discovered" the potential...
Should Frank go on listing a lifetime commitment to audio?
Frank does respect younger coot Brett though, whishing him all the best in his new (ad)venture....
So, what about that phono stage?
Cheers,
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