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PostPosted: 10 May 2017, 21:18 
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Joined: 06 Jun 2008, 18:23
Posts: 4913
Location: Australia
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.
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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 14 May 2017, 09:04 
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This realy didn't work. Very long and painful story short: I converted into a Mimic MM preamp with an OPA2134 chip. All good now. Quite happy.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 14 May 2017, 09:05 
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New name though: "Black Shadow".

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 14 May 2017, 15:04 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi Mark, what went wrong with the 833s? I prefer the 2134s but the others ought to have been OK.

Good listening
Bruce

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PostPosted: 14 May 2017, 18:27 
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Building the preamp as a MC stage means, as you know, requires high gain. This came with a high level hiss. I tried three differnt chips, Burson V5i-D, LM833 and OPA2134. The worse for hiss was the Burson then the 2134 and best of all the 833. Even on low efficiency speakers the hiss was audible from listen position. Some would say it's low enough not be noticable but when I can build a Mimic MM with no audible noise and a seperate MC step-up, why put up with it.

To this end I have made the preamp a MM only and are using one of my three really good MC step-ups to do the pre-preamp work. Great combo. I have about four hours of listening with the new Mimic under my belt and am enjoying the new Mimic about to be named "Black Shadow". One: it is glossy black and two: it shadows what is in the groove. Pleased with the look and the sound. It is very compact also which adds to its cool look.

I used very standard parts, nothing special; MKTs and NP (4.7uf) caps, metal film resistors but a mil-spec machined chip socket. I have found this combo of parts sounds the best and is real easy and cheap to work with.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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PostPosted: 17 May 2017, 04:54 
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Joined: 28 Nov 2014, 15:21
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Location: Queensland, Australia.
G'day all, yes that circuit as an MM stage is hard to beat! My favourite personal version at the moment is using an NE5532, a nice 'cool' sound and very quiet! Regards, Felix.


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