Phono Stage Only?

CptTripps · 6th August 2003, 03:01 AM

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...

EC8010 · 6th August 2003, 07:35 AM

I expect other people will say it as well, but phono stages are the hardest. Rather than plunging in at the deep end, you might prefer to first make something easier - otherwise, the difficulties might completely put you off.

pedroskova · 6th August 2003, 10:14 AM

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.

CptTripps · 6th August 2003, 12:31 PM

I appreciate the advise. a kit is exactly what I should be looking for. I'd MUCH rather be able to take a design and just use better parts than have to figure it out on my own.

Any suggestions on where to buy the kits?

pedroskova · 6th August 2003, 12:48 PM

addresses to the companies I mentioned above

http://members.aol.com/_ht_a/kevinc9...mtbrand=AOL_US

http://www.hagtech.com/

http://www.bottlehead.com/et/adobesp.../seduction.htm

Brett · 6th August 2003, 01:19 PM

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.

CptTripps · 6th August 2003, 07:45 PM

I just spoke to Kevin at K&K and ordered his "kit" for the whole ball of wax. (transformers and chassis ect...)

Thanks for the advise. I'll let you all know how it turns out. =)

Brett · 6th August 2003, 07:52 PM

Quote:

Originally posted by CptTripps
I just spoke to Kevin at K&K and ordered his "kit" for the whole ball of wax. (transformers and chassis ect...)

Thanks for the advise. I'll let you all know how it turns out. =)

I'll look forward to that.

pedroskova · 6th August 2003, 07:53 PM

Wow, that was quick.

I'm jealous.

Look forward to your opinion.

CptTripps · 6th August 2003, 09:07 PM

Quote:

Originally posted by pedroskova
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.

6th August 2003, 03:01 AM	#1
CptTripps diyAudio Member Join Date: Feb 2003 Location: Columbus, OH	Phono Stage Only? 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...

6th August 2003, 07:35 AM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	I expect other people will say it as well, but phono stages are the hardest. Rather than plunging in at the deep end, you might prefer to first make something easier - otherwise, the difficulties might completely put you off. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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6th August 2003, 10:14 AM	#3
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	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.

6th August 2003, 12:31 PM	#4
CptTripps diyAudio Member Join Date: Feb 2003 Location: Columbus, OH	I appreciate the advise. a kit is exactly what I should be looking for. I'd MUCH rather be able to take a design and just use better parts than have to figure it out on my own. Any suggestions on where to buy the kits?

6th August 2003, 12:48 PM	#5
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	addresses to the companies I mentioned above http://members.aol.com/_ht_a/kevinc9...mtbrand=AOL_US http://www.hagtech.com/ http://www.bottlehead.com/et/adobesp.../seduction.htm

6th August 2003, 01:19 PM	#6
Brett diyAudio Member Join Date: Jan 2002	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.

6th August 2003, 07:45 PM	#7
CptTripps diyAudio Member Join Date: Feb 2003 Location: Columbus, OH	I just spoke to Kevin at K&K and ordered his "kit" for the whole ball of wax. (transformers and chassis ect...) Thanks for the advise. I'll let you all know how it turns out. =)

6th August 2003, 07:53 PM	#9
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	Wow, that was quick. I'm jealous. Look forward to your opinion.

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