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Old 15th November 2009, 04:58 PM   #2671
Salas is offline Salas  Greece
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0.32mV on mine's individual spec sheet at 47k. Less on 150R I use. They market it as 0.25mV 100R min load.
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Old 15th November 2009, 05:14 PM   #2672
RCruz is offline RCruz  Switzerland
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The 56db version is intended to work with what cart output values ?

Last edited by RCruz; 15th November 2009 at 05:17 PM.
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Old 15th November 2009, 05:22 PM   #2673
Salas is offline Salas  Greece
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0.5mV as footnoted on the circuits posted. Can work good up to 0.8mV for your Clearaudio Goldfinger second fiddle cart cheapy, going from 0.025% THD to about 0.04% Rather loud but still OK.

With Benz ACE red around 0.4mV works too. With lower cart you start to feel you need extra gain. At least in systems with not too much line preamp gain.

The gain I have set for each version was compared to typical CDP output at same volume level, no much less so to luck, not more so to shout and also to save on second stage distortion. Not in mV, but by playing cds and records.

The MM version's gain is good for 3-5mV. The Medium's for 1-2mV, the Normal MC's for 0.4-0.5mV. The Low MC's (either with 1st stage's Rs bypass or the latest post with 4 njfets and high B+) good for 0.2-0.3mV.

I hope I give you the sum picture.
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Old 15th November 2009, 05:27 PM   #2674
RCruz is offline RCruz  Switzerland
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Yes

Thank you again... I did not have that info in my riaa spreadsheet and I believe it is pertinent.

Ricardo
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Old 22nd November 2009, 11:53 AM   #2675
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Default ot load

HI Salas

with a trafo step-up 1:15 ,for the same load of 180r, which r ?
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Old 22nd November 2009, 12:38 PM   #2676
Salas is offline Salas  Greece
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40.5k
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Old 23rd November 2009, 07:01 PM   #2677
RCruz is offline RCruz  Switzerland
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Hi Salas

My new toys are two VTL 160 made by Manley. Manley_160Watt_Amplifier

I am considering building a buffer to place between them and the riaa so I can get volume control.

As a matter of fact I already built two pedja buffers and have the 50k pot and my idea is: 1st Riaa, 2nd pot, 3rd buffer, 4th tube amps.

It feels a little strange to place more caps in the signal path so I am wondering if I can place the pot directly inside the riaa (just before the output buffer)... can it be done without messing with the riaa values ?

Ricardo
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Old 23rd November 2009, 07:11 PM   #2678
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Last edited by nicoch58; 23rd November 2009 at 07:20 PM.
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Old 23rd November 2009, 07:12 PM   #2679
Salas is offline Salas  Greece
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After the second stage whatever you do, it does not mess the Riaa. With 750mV sensitivity of the Manley, a buffered volume pot isn't a bad idea. You would have to pass DC through your pot though, because the second stage biases the Simplistic's output buffer. Can be scratchy and short lived. I would just delete the existing buffer, move the existing output cap to the 2nd stage out, then add the pot and drive the external buffer.
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Old 23rd November 2009, 07:20 PM   #2680
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Salas what we can do with new Ricardo amp?
put out two tubes and mismatch the speakers ?

lover the b+ and add 6v6 )
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