Phono Preamp for Creamic Cartridge

kokuhorice · 17th August 2011, 11:51 AM

I would like to buiild a Phono Preamp for my vintage TT with Ceramic Cartridge. Output from this phono would be fed to Onkyo HT-R380 AVR.
Below are some schematics. Let me know the best one or any other alternative.

DF96 · 17th August 2011, 12:34 PM

What do you mean by "best"? We can't tell you which preamp you might prefer, any more than we can tell you which type of music you should play. Why not build the simplest one, and see if it is good enough?

Leon08 · 17th August 2011, 01:45 PM

I would build one with the op-amp.It's easy and can be modified if needed

indianajo · 07:00 PM

Figure 2, 8, 9 look as if they have the RIAA roll off, and 2n3904 are easy to come by. The op amp one looks as if it is missing the RIAA rolloff. If you can find an opamp mag phone schematic, you can adapt for ceramic input by decreasing the gain by decreasing the feedback resistor. See the mag phono input at the end of this thread Improving a "Disco mixer" to mid-fi performance The feedback resistor is the 1.5 megohm one from point to minus input, try 150k at first. I'm using ST33078 op amps. They don't latch up if the input hits the rail like TL07x ones do.
IMHO ceramic cartridges don't really do hi-fi so an ultimate low noise gain stage is probably a waste of time. 1-10 uf capacitors are as easily film dielectric now as electrolytic, and you don't have to worry about the polarity.

toprepairman · 17th August 2011, 06:58 PM

Going from memory back in the old days of discos in the 60's and 70's, there wre two options when using ceramic carteidges, when the cheapo's were Sonotone 9TAHC's, or if you went posh you'd use Decca Derams.
You could either high impedance load them and the natural response of the ceramics was a close approximation to the RIAA curve, or you could 'velocity' load with a lower impedance and use RIAA equalisation which again was the preferred approach.
Us with velocity loaded Derams could sneer at lesser types with Hi z 9TAHC's. A bit sad really......

toprepairman · 17th August 2011, 07:00 PM

Yes I can spell cartridges, that was a typo.
Pip pip, Henry

Chris Hornbeck · 17th August 2011, 10:40 PM

Assuming that your AVR has a phono input (not automatically true these days...) the best solution is to load each channel with a coupla-K ohm resistor and feed it into the phono input. In this case the exact value of load resistor doesn't change frequency response, but does change level.

All good fortune,
Chris

17th August 2011, 11:51 AM	#1
kokuhorice diyAudio Member Join Date: Aug 2011	Phono Preamp for Creamic Cartridge I would like to buiild a Phono Preamp for my vintage TT with Ceramic Cartridge. Output from this phono would be fed to Onkyo HT-R380 AVR. Below are some schematics. Let me know the best one or any other alternative.

17th August 2011, 06:45 PM	#4
indianajo diyAudio Member Join Date: Jan 2010 Location: Jeffersonville, Indiana USA	Figure 2, 8, 9 look as if they have the RIAA roll off, and 2n3904 are easy to come by. The op amp one looks as if it is missing the RIAA rolloff. If you can find an opamp mag phone schematic, you can adapt for ceramic input by decreasing the gain by decreasing the feedback resistor. See the mag phono input at the end of this thread Improving a "Disco mixer" to mid-fi performance The feedback resistor is the 1.5 megohm one from point to minus input, try 150k at first. I'm using ST33078 op amps. They don't latch up if the input hits the rail like TL07x ones do. IMHO ceramic cartridges don't really do hi-fi so an ultimate low noise gain stage is probably a waste of time. 1-10 uf capacitors are as easily film dielectric now as electrolytic, and you don't have to worry about the polarity. __________________ Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500 Last edited by indianajo; 17th August 2011 at 07:00 PM.

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17th August 2011, 12:34 PM	#2
DF96 diyAudio Member Join Date: May 2007	What do you mean by "best"? We can't tell you which preamp you might prefer, any more than we can tell you which type of music you should play. Why not build the simplest one, and see if it is good enough?

17th August 2011, 01:45 PM	#3
Leon08 Banned Join Date: Sep 2010 Location: at Home	I would build one with the op-amp.It's easy and can be modified if needed

17th August 2011, 06:58 PM	#5
toprepairman diyAudio Member Join Date: Nov 2010	Going from memory back in the old days of discos in the 60's and 70's, there wre two options when using ceramic carteidges, when the cheapo's were Sonotone 9TAHC's, or if you went posh you'd use Decca Derams. You could either high impedance load them and the natural response of the ceramics was a close approximation to the RIAA curve, or you could 'velocity' load with a lower impedance and use RIAA equalisation which again was the preferred approach. Us with velocity loaded Derams could sneer at lesser types with Hi z 9TAHC's. A bit sad really......

17th August 2011, 07:00 PM	#6
toprepairman diyAudio Member Join Date: Nov 2010	Yes I can spell cartridges, that was a typo. Pip pip, Henry

17th August 2011, 10:40 PM	#7
Chris Hornbeck diyAudio Member Join Date: May 2011 Location: Little Rock	Assuming that your AVR has a phono input (not automatically true these days...) the best solution is to load each channel with a coupla-K ohm resistor and feed it into the phono input. In this case the exact value of load resistor doesn't change frequency response, but does change level. All good fortune, Chris

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