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255 Search Results Found |
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Forum: Thermionic Emissions «»
Posted on: Fri, 01 July 2022 13:21 «»
By: gofar99
Re: The next big thing
Hi Everyone. This morning I paired the amp with a Groove phono preamp. A really exceptional combination. No line stage or anything else. Super quiet, no hum at any level even full gain. Some tube hiss at really high gain levels that comes from the Gro...
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Forum: Source «»
Posted on: Thu, 27 January 2022 17:32 «»
By: positron
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
If I may Gofar, I think I can help with a closer, more accurate, and long term stability/success. I agree, no negative feeback loops, except for a very small amount of current feedback from the cathode resistor to give biasing etc (in my design). You may w...
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Forum: Source «»
Posted on: Tue, 25 January 2022 20:44 «»
By: gofar99
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
Hi Good thoughts, but my experience is somewhat different. I find that tubes from one company do not always match characteristics with those from another. Several parameters can differ, Mu, Rp, residual noise and MillerC. Rp is the thing that seems mos...
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Forum: Source «»
Posted on: Mon, 24 January 2022 09:36 «»
By: positron
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
If I understand you correctly, the actual accuracy of the rest of the system also needs to be investigated. With that in mind, I don't seen any reason not to start with the RIAA network as it costs very little.
I have tried different tubes and the ...
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Forum: Source «»
Posted on: Sun, 23 January 2022 20:21 «»
By: gofar99
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
Hi, I have found the various sets of formulas to be more or less close. They don't tell the whole story as the compliance with RIAA requires the output of the preamp to be right, not necessarily any individual stage. I use a 1% accurate inverse network w...
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Forum: Source «»
Posted on: Sun, 23 January 2022 14:36 «»
By: Strum Drum
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
Thank you, positron, for explaining the situation in simple terms. You would make a great teacher. I'm just so surprised that they messed up the math. It does seem complicated, though. Well, honestly, it goes over my head. Thanks for the share. It wa...
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Forum: Source «»
Posted on: Sat, 22 January 2022 23:27 «»
By: positron
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
What Stanley is stating is that the design equations used by the designers/engineers are not correct. It is one thing to calculate a single pole complex math problem, but when multiple poles are needed, very complex math is needed. The designers/engineer...
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Forum: Source «»
Posted on: Sat, 22 January 2022 19:22 «»
By: Strum Drum
Re: Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
What's the reason behind the inaccuracies, though? I read the article and couldn't find the reason that so many models are like this. I saw this bit, - "These errors are due in part to the perpetuation in print of incorrect formulas for the design o...
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Forum: Source «»
Posted on: Fri, 21 January 2022 15:44 «»
By: positron
Wide Spread RIAA Phono Stage Inaccuracies by Manufacturers
Hi Gents,
I finally found the AES article covering RIAA equalization by Stanley Lipshitz I lost many moons ago. According to the article, there is a problem with correct RIAA equalization design in phono stages. (I am wondering about recording as well.)...
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Forum: Thermionic Emissions «»
Posted on: Sun, 12 December 2021 00:52 «»
By: positron
Re: ECC 82 recommendation | Telefunken vs Mazda Belvu
Hello Kasper, Bruce, and other Gentlemen,
I hope to provide a general reply to the subject at hand, and some personal information as others may not know me.
As an introduction, I have been doing R&D for some 40+ years developing an audio system i...
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