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Old 26th January 2013, 10:13 PM   #9161
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Nice

Here you have my actual setup.....
Very nice RCruz.

Initial impressions. I came home with a RIAA. It wasnt the Simplistic HAving been around the block with the Salas Shunt, I was not surprised by the black as night background, but he was. We had some hum, but I believe it was layout and trafo related. The 50Va hammonds I bought hummed from the very beginning. The shunt reg was set for 38V and 175mA. They should not be working that hard. Dissapointed to say the least. Hum was not bad, but noticeable playing classical and with volume cranked, naturally. You could tell the caps had not been broken in, having that compressed new cap sound. Not worried at all, as I am sure that will go away. As for the sound, It was wonderful. Punchy and dynamic. Clean with good overall presentation of the soundstage. Brother could not get over the fact that he was enjoying a SS RIAA so much. He said it was the only other SS RIAA he had heard the he liked, with one exception being the XOno. Not bad company. I look forward t more listening, as I know the caps will continue ti develop and losen up. IF this thing decompresses like I expect, I will have a big hats off to Salas. I do trust his ears.

Brother told me to get the best componenets I could. I will be looking at Auricap or Multicap, leaning toward Auricap. I am considering going with Rush's DCB1 output, As we want to use Vcap in the output and 2uF Vcap is borderline crazy. I have not put it on test bench officially, but It is very quiet. It is my hope that we are reaping the rewards of the SMD parts and excellent design of Salas in both the Shunt and Riaa stages. I want to try to find the 369, as I want the lowest noise option. Any help here is appreciated.

What can I say, Salas. Another winner. I may pick your brain about layout to make sure it is not an issue in terms of noise. Thid thing deserves a concentrated layout attempt. It will only get better.
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Last edited by buzzforb; 26th January 2013 at 10:15 PM.
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Old 26th January 2013, 10:20 PM   #9162
Salas is online now Salas  Greece
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See to sort out the hum issues first, box it up in metal and use coax for signal. Tx & rectification in separate box. Even with new lytics its the hum that adds low freq harmonics and sounded kinda squat. Good start nonetheless. 60dB totally quiet phono ain't easy in the open, so far so good. Congrats.
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Old 26th January 2013, 10:29 PM   #9163
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I mat try using big Antek tomorrow and running both shunts off one trafo. IT is 400VA. I will haev to kill some voltage with resistor, but no big deal.
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Old 26th January 2013, 11:54 PM   #9164
Rush is offline Rush  United States
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I want to try to find the 369, as I want the lowest noise option. Any help here is appreciated.
Salas,

Any way to use 12 mA idss 369? I have a pair at 12 I would like Buzzforb to use, if you could make the circuit work for that high idss. Is it a whole new design?

Rush
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Old 27th January 2013, 12:32 AM   #9165
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No worries. Amps lab has some. I'll just get the there, although I do have a question. I believe you said a single 369 beat dual 170's. what about distortion? I would think dual 170's would have better linearity than single 369.
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Old 27th January 2013, 09:02 AM   #9166
RCruz is offline RCruz  Switzerland
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About the violin..... No.. not really..

I gave up Contrabaixo years ago and violin is even more difficult.

Sometimes I hit the flute and the piano, but I do not have enough fluidity with strings.
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Old 27th January 2013, 09:08 AM   #9167
RCruz is offline RCruz  Switzerland
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Hi buzz... this folded version picks up like an antena.... enclosure is a must.... I use copper case but iron is also very good.

My builds are totally silent.
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Old 27th January 2013, 09:33 AM   #9168
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.I knew it would be susceptable to hum. I am taking big donut over there today. It may not help much, but the hammonds hummed right out of the box.
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Old 27th January 2013, 09:35 AM   #9169
Salas is online now Salas  Greece
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Salas,

Any way to use 12 mA idss 369? I have a pair at 12 I would like Buzzforb to use, if you could make the circuit work for that high idss. Is it a whole new design?

Rush
You could up the Rs until it runs ~9mA in the same circuit.
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Old 27th January 2013, 09:39 AM   #9170
Salas is online now Salas  Greece
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Hi buzz... this folded version picks up like an antena.... enclosure is a must.... I use copper case but iron is also very good.

My builds are totally silent.
Not in our test, it was the same like the telescopic with open lid in same box, psu and grounding arrangement. Had no hum or buzz. It will pick up from a contaminated ground as much as a telescopic from a contaminated rail. There is no high gain phono we can afford to roughly test unpackaged and expect no hum nonetheless.
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