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Here is yet another Mimic phono stage (Mimic Retro-833MC). This time MC only and staying with the LM833 OPAMP. It was the quietest in the build and I like the sound. All on a prototype brd. including differential PS. This time in an epoxy enamel cast Al enclosure. Silver soldered and silver plated hookup wire. No shielded wire to dull the sound. Sounds solid and balanced.
| retro-thermionic |
Edits: 05/10/17 05/10/17Follow Ups:
......is the phono ground lug. Perhaps you are using a Rega arm?
The blue RCA at the front is a battery test pint only. It simply means you do not have to pull the preamp apart just to check battery health. Battery life is about 100hours.
Thanks for the nice comments.
| retro-thermionic |
nt
No not a battery charge point. Four screws hold the bottom on once removed battery replacement is simple.
| retro-thermionic |
His other question was about a ground connection for the turntable. Most turntables have a separate ground wire and most phono stages have a ground lug. How do you ground your turntable and/or tonearm to the phono stage?
Thanks,
John Elison
As you may know Regas don't have grounding wires. I have a new Rega p3 so grouding not required and there is no hum.
In the past I have put a grounding terminal on my phono stages. If your TT had a ground wires you could use an alligator lead to go from the wire to the switch on the phono preamp.
| retro-thermionic |
Nice build. I always admire people that have the skills to do this stuff. When I see circuits like these (as simple as they are) my head starts spinning....Heck, I had a hart time just wiring up my SUT....
I have since converted this phono preamp to a MM preamp and not MC. As a MC preamp it had a low level hiss which usually this design doesn't have. By coverting it to a MM preamp that hiss has gone. Also the OPA2134 opamp works much better also.
| retro-thermionic |
Thanks for the nice comment. I've been doing this type of thing (started with tube amps and speakers) for over 45 years. Still love being on the end of a soldering iron.
For me listening to music is a double headed delight. I enjoy the music and enjoy the gear I make. My three systems are 90% DIY. I'm evening making my on DACs and music servers these day. I don't make, TTs, CD players or tuners. But do make everything else.
| retro-thermionic |
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