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-   -   4 into 1 Phono (http://www.diyaudio.com/forums/analogue-source/232798-4-into-1-phono.html)

MLStrand56 25th March 2013 09:09 PM

4 into 1 Phono
 
Now I'm convinced that I need to build a 4 into 1, Line Level, Phono Switcher.

I need 4x Phono RIAA pre-amp ckt. boards. I also need to be able to switch IN/OUT a MC Head Amp to Any of the 4 Phono ckts.

I know this is expensive, but I need Quality!!!! I'm a Vinylphile!!!

MLStrand56

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counter culture 25th March 2013 10:53 PM

A vinylphile is one thing, but what have you got? 8 ears?

andyr 26th March 2013 01:20 AM

Quote:

Originally Posted by MLStrand56 (Post 3427229)

Now I'm convinced that I need to build a 4 into 1, Line Level, Phono Switcher.

At line level, this shouldn't be a problem: Lorlin make a 5-in/1-out stereo switch, which is used for source selection in my preamp. :)

Quote:

Originally Posted by MLStrand56 (Post 3427229)

I need 4x Phono RIAA pre-amp ckt. boards. I also need to be able to switch IN/OUT a MC Head Amp to any of the 4 Phono ckts.

If you need to be able to switch IN/OUT an MC head amp to any one of the 4 phono circuits ... this must be done at MC signal level (not line level). IME, you will degrade the signal by inserting any kind of switch at these low signal levels.

So if you're an "audiophile" ... you won't do this. :p

Regards,

Andy

nigelwright7557 26th March 2013 01:31 AM

I would switch the outputs of the pre amps.

oshifis 26th March 2013 10:47 AM

The OP did not say the 4 RIAA boards will be identical. Perhaps his intention is to compare them, or using the right sounding one for each LP :confused:

MLStrand56 26th March 2013 04:31 PM

4 Turntables.
 
Quote:

Originally Posted by counter culture (Post 3427390)
A vinylphile is one thing, but what have you got? 8 ears?

No I have two Yamaha PX-3's, one Bang & Olfsen 4004, & one Technics SL-1400 Mk2. I have various cartridges for different kinds of music or LP condition.

Not 8 ears, but 10 ch's. Five x Yamaha MX-1000U Amps.

MLStrand56

MLStrand56 26th March 2013 04:42 PM

MC switch
 
Quote:

Originally Posted by andyr (Post 3427554)
If you need to be able to switch IN/OUT an MC head amp to any one of the 4 phono circuits ... this must be done at MC signal level (not line level). IME, you will degrade the signal by inserting any kind of switch at these low signal levels. So if you're an "audiophile" ... you won't do this. :p
Andy

Of course the MC amp (or step up XMFR) must be inserted before the phono EQ ckt!!! I know the MC amp can be switched in/out (probably electronically). If not, how do you explain the MC/MM switch on many pre-amps with only one phono ckt?

I never said or implied that this would be easy. I know for certain that it's Not impossible! I just don't give up as easily as you apparently do.

MLStrand56

MLStrand56 26th March 2013 04:57 PM

Output Selector
 
Quote:

Originally Posted by nigelwright7557 (Post 3427565)
I would switch the outputs of the pre amps.

The outputs of my Pre-Amp (Sony TA-E2000ESD) go to a pair (L & R) of Yamaha DSP-1's. Or are you talking about a line level output selector After the Phono EQ ckt? That's where I would put the selector switch. I think a 4-pos rotary switch would work great.

MLStrand56

MLStrand56 26th March 2013 05:05 PM

Identical RIAA boards
 
Quote:

Originally Posted by oshifis (Post 3427937)
The OP did not say the 4 RIAA boards will be identical. Perhaps his intention is to compare them, or using the right sounding one for each LP :confused:

I think that 4 x identical RIAA boards is the best way to go.

Compare what? I do use each turntable differently. Also the condition of the LP dictates which TT & Cartridge I use.

MLStrand56

andyr 26th March 2013 07:38 PM

Quote:

Originally Posted by MLStrand56 (Post 3428372)

Of course the MC amp (or step up XMFR) must be inserted before the phono EQ ckt!!! I know the MC amp can be switched in/out (probably electronically). If not, how do you explain the MC/MM switch on many pre-amps with only one phono ckt?

Yes, some components have an MC/MM switch - a mate of mine has one. However, because he only listens to HOMI Grado (his RR1), he removed the switch - and he said the sounded better, as a result.

IOW, the switch - when it was in place - was degrading the cartridge signal.

Quote:

Originally Posted by MLStrand56 (Post 3428372)

I never said or implied that this would be easy. I know for certain that it's Not impossible! I just don't give up as easily as you apparently do.


It's not impossible to switch the cartridge input signal - but if you do this, the sound will be degraded, compared to if there was no switch. Therefore I do not do it, because I like to have the best sound I can get. You are free to make a different choice. :p


Regards,

Andy


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