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Old 5th February 2014, 11:31 PM   #2511
Salas is offline Salas  Greece
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Quote:
Originally Posted by JimT View Post
Thanks
Jim
We possibly crossposted.
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Old 8th April 2014, 08:18 PM   #2512
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Hi folks , a question about a hum noise in buffer circuit with a simple crc+ 2last separate rc for each channel. I'm no surprise for litle noise with this kind of supply, but the noise go down a lot at maximum volume without and song is very clear the change of level...
Could somebody light me about?
Thanks a lot for any answer ...
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Old 8th April 2014, 08:45 PM   #2513
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Hi,

Not sure I understand but are you certain you have the volume control wired up correctly?

Ciao,
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Old 8th April 2014, 09:16 PM   #2514
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I think Was right i Can control level simpy the noise when the pot is in position without attenuation go down somebody db at my (not only) ear
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Old 9th April 2014, 02:27 AM   #2515
Salas is offline Salas  Greece
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The pot needs its body grounded also. Revisit the grounding scheme.
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Old 9th April 2014, 08:59 AM   #2516
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The pot is an blue alpls, the cover is mainly in plastic i have to ground the upper side? I'll try this evening thanks a lot!
the sound it's very good! I'll try with SE EL34 and with a little T-amp and result was fantastic gain in deep, detail and "body" of sound..., I'm thinkng to separate in two cabinet pre and supply for give him in future the chance of better supply based on your circuit.
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Old 9th April 2014, 09:19 AM   #2517
Salas is offline Salas  Greece
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The Alps face plate is metal. It usually grounds when mounted to a zero referenced chassis. When not like that, use a collar and a ground wire.
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Old 9th April 2014, 09:22 AM   #2518
Salas is offline Salas  Greece
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P.S. About the sound congratulations. It will be even better when you will finish with all the build details. Better PSU is always a plus also. Post us some pictures when done.
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Old 11th April 2014, 05:43 PM   #2519
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Salas,
Time to rebuild the 6v6 preamp and I had a couple of questions. If I wanted to have balanced out, would it be smarter to use a unity gain phase splitter like the one found in the impasse, or a transformer? Would a standard 600: 600 transformer work on the output or would it cause issue? Lastly, have you had a chance to listen to the Amtrans Carbon Film?
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Old 11th April 2014, 05:58 PM   #2520
Salas is offline Salas  Greece
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Such Tx would load down the gain version's higher than 600R Zo. Better an active splitter, or step down 5k primary Tx instead of resistor anode load with balanced secondary. Given that your system gain allows 1:3 gain loss at the pre. Line noise will go down accordingly as microphony also nonetheless.

*No use of Amtrans yet. BTW they have given good feedback on it in the phono thread but they ultimately preferred the very low ppm foil and the non inductive ww very low ppm too. But in no power demanding locations.
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