Simple tube phono stage

ambience exists · 23rd June 2008, 11:34 PM

Hello World,

I am looking for a schematic of a very very simple tube based phono preamp that would pair nicely with my S-5 Electronics K-12 tube amplifier.

It would be nice to have a power supply diagram as well!

Eli Duttman · 24th June 2008, 12:15 AM

Phono preamps are among the most difficult of projects to execute. A suitable circuit is not sufficient. Great care in mechanical layout is a must too.

If you are adamant about building a tubed phono preamp, I suggest you look at the Bottlehead Corp. Seduction kit. You'd have reasonable prospects of a successful outcome.

Frankly, the K-12 isn't good enough to benefit from such a high quality source. The opamp based Hagerman Bugle is quite adequate as source for a K-12.

ambience exists · 24th June 2008, 10:37 PM

Thanks a lot, I realize that the K-12 isn't an Audio Note Gakuon or anything!

Are there any other cheap solid states I could look at?

fdegrove · 24th June 2008, 11:54 PM

Hi,

If you're looking for a SS phono then why put you quest in the tube section?

Before you design or ask about a simple phone preamp_ they do exist_, why don't you tell us what your cartridge is, what the Zin of your amps is and how long the IC is you plan on using with it? And what you expect from the preamp?

Cheers,

astouffer · 25th June 2008, 12:24 AM

The RJM phono stage worked well for me.

http://www.geocities.com/rjm003.geo/.../diy_pho3.html

jduffy · 25th June 2008, 05:18 PM

Personally, I'd build the Hagtech Cornet2. You can do it on the cheap if you're careful and the sound is amazing. It's also a very simple build as it's on a circuit board as opposed to point to point.

Just a warning though, purists don't consider a phono preamp on a circuit board to be a proper phono preamp. They believe for best sound it has to be P2P. Me? I love the Cornet2. The thing sounds simply amazing.

If you build the Cornet2 you won't need another phono preamp probably for a long time to come.

Good luck with your decision.

Shoog · 25th June 2008, 06:48 PM

Quote:

The RJM phono stage worked well for me.

http://www.geocities.com/rjm003.geo...o/diy_pho3.html

Very good. I built one with a OPA627.

I heard a build with top flight components which put my tube based one to shame. Extremely easy to build, though not that cheap if you opt for the OPA chips. Texas instruments are quite easy to get sample out of though.

Shoog

ambience exists · 26th June 2008, 07:59 PM

We should probably continue this on the SS forum before we get hurt...

Eli Duttman · 27th June 2008, 02:29 AM

Tubed or SS, a high quality phono preamp is going to be wasted, when connected to an amp that's not much better than a toy.

AAMOF, the Hagerman Bugle is better than the K-12 deserves.

23rd June 2008, 11:34 PM	#1
ambience exists diyAudio Member Join Date: Jun 2008	Simple tube phono stage Hello World, I am looking for a schematic of a very very simple tube based phono preamp that would pair nicely with my S-5 Electronics K-12 tube amplifier. It would be nice to have a power supply diagram as well! __________________ ((AE))

24th June 2008, 12:15 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Phono preamps are among the most difficult of projects to execute. A suitable circuit is not sufficient. Great care in mechanical layout is a must too. If you are adamant about building a tubed phono preamp, I suggest you look at the Bottlehead Corp. Seduction kit. You'd have reasonable prospects of a successful outcome. Frankly, the K-12 isn't good enough to benefit from such a high quality source. The opamp based Hagerman Bugle is quite adequate as source for a K-12. __________________ Eli D.

24th June 2008, 10:37 PM	#3
ambience exists diyAudio Member Join Date: Jun 2008	Thanks a lot, I realize that the K-12 isn't an Audio Note Gakuon or anything! Are there any other cheap solid states I could look at? __________________ ((AE))

24th June 2008, 11:54 PM	#4
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, If you're looking for a SS phono then why put you quest in the tube section? Before you design or ask about a simple phone preamp_ they do exist_, why don't you tell us what your cartridge is, what the Zin of your amps is and how long the IC is you plan on using with it? And what you expect from the preamp? Cheers, __________________ Frank

26th June 2008, 07:59 PM	#8
ambience exists diyAudio Member Join Date: Jun 2008	We should probably continue this on the SS forum before we get hurt... __________________ ((AE))

25th June 2008, 12:24 AM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	The RJM phono stage worked well for me. http://www.geocities.com/rjm003.geo/.../diy_pho3.html

25th June 2008, 05:18 PM	#6
jduffy diyAudio Member Join Date: Oct 2006	Personally, I'd build the Hagtech Cornet2. You can do it on the cheap if you're careful and the sound is amazing. It's also a very simple build as it's on a circuit board as opposed to point to point. Just a warning though, purists don't consider a phono preamp on a circuit board to be a proper phono preamp. They believe for best sound it has to be P2P. Me? I love the Cornet2. The thing sounds simply amazing. If you build the Cornet2 you won't need another phono preamp probably for a long time to come. Good luck with your decision.

27th June 2008, 02:29 AM	#9
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Tubed or SS, a high quality phono preamp is going to be wasted, when connected to an amp that's not much better than a toy. AAMOF, the Hagerman Bugle is better than the K-12 deserves. __________________ Eli D.

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