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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: phono stage RIAA question. posted by lovetube on February 25, 2011 at 20:24:13:
Your circuit has a slight error, causing the lack of bass boost. You have a 330K resistor across the 33K resistor. Change that 330K R to a 3300 pf cap for a quick fix. The resistors can be tweaked, as well, but, this 3300 pf cap will quickly yield the required bass...
Concerning the required RIAA treble deemphasis, if your circuit does not satisfy your ears and you want more high frequency cut, you can add another EQ filter pole to ground after this network.
Research the passive phono EQ published circuits beginning circa early 1950s. RIAA was standardized in 1954. Many, many passive EQ circuits have been implemented with 6SL7s since then. Many are available online. In my lower post to this thread, I gave the link to the JE Labs site. Joe's mono playback system has many virtues. His design topology can easily be implemented as dual mono stereo preamp stages. By using separate power supplies for each stage as well as each channel, ultimate detail and stereo separation with amazing soundstage effects can be achieved.
While I am a bigger fan of active feedback phono EQ, made popular in the early stereo era, I do know more than a few folks that have implemented the passive EQ to their satisfaction. Happy tunes await you; so, ENJOY !
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Follow Ups
- Passive EQ phono stage RIAA question. - Interstage Tranny 17:21:24 02/26/11 (4)
- Hi Interstage Tranny - lovetube 17:37:20 02/26/11 (2)
- Hi ! It's not difficult at all; just tedious work; after reading over and over... - Interstage Tranny 18:00:00 02/26/11 (1)
- RE: Hi ! It's not difficult at all; just tedious work; after reading over and over... - lovetube 20:45:01 02/26/11 (0)
- Thanks IT and other who response . - lovetube 17:30:31 02/26/11 (0)
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