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Old 21st September 2013, 11:13 AM   #1
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Default Looking for 52dBs or more MM phono

Looking for a schematic 52dBs or more for MM phono.

TIA
Felipe
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Old 21st September 2013, 05:08 PM   #2
kevinkr is offline kevinkr  United States
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If you are brave and can read the entire thread for the final version, development and tweaking was a journey, you might want to take a look at this:

The "Muscovite" 6S3P Tube Phonostage

It would require very good scratch construction skills.
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Old 21st September 2013, 06:29 PM   #3
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Thanks for the link, I started to read it, thanks to share your design.
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Old 22nd September 2013, 03:11 AM   #4
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Kevin, is the current capability of a 5AR4 or 6BY5 really needed? I suspect a "dirt cheap" 7Z4 would get the job done. If PIV is a problem, UF4007s in series with the 7Z4's anodes will resolve things. Yes, I'm cheap!
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Old 22nd September 2013, 03:23 AM   #5
kevinkr is offline kevinkr  United States
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Hi Eli,
A much more modest rectifier could be employed. Power consumption per channel should not much exceed 20mA, slight variations are likely due to variations in transconductance.

The power supply consumes significant current as well.

I have a fair number of vintage 5AR4 running in low current applications, they will still be running fine when I am long gone.

It runs a lot of hours and since completed has not had any downtime. Listening to it right now in fact.
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Old 22nd September 2013, 02:28 PM   #6
Koifarm is offline Koifarm  Netherlands
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Just my 2 cents.
52db at your service.

Mini-Me phono preamp
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Old 22nd September 2013, 03:46 PM   #7
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Quote:
Originally Posted by Koifarm View Post
Just my 2 cents.
52db at your service.

Mini-Me phono preamp
Interesting thread thanks to share
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Old 22nd September 2013, 08:45 PM   #8
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Interesting Preamp KevinKr. I'm also using SPU's. My table is a restored 301. I'm built a step-up transformer using a pair of Hashimoto HM-3 step-ups into a McIntosh C22. It sounds great but I love playing so I may build your incredible phono pre. I'm playing with the idea of Battery PSU using 6 48v batteries for the ht and some others for the heaters. As long as I can get 8 hours from a charge I should be good.
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Old 22nd September 2013, 11:08 PM   #9
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by mark02131 View Post
Interesting Preamp KevinKr. I'm also using SPU's. My table is a restored 301. I'm built a step-up transformer using a pair of Hashimoto HM-3 step-ups into a McIntosh C22. It sounds great but I love playing so I may build your incredible phono pre. I'm playing with the idea of Battery PSU using 6 48v batteries for the ht and some others for the heaters. As long as I can get 8 hours from a charge I should be good.
Bear in mind that the input cascode has absolutely no PSRR at all, and the matching supply was designed with low output impedance and extremely low noise expressly for this reason. Honestly I am not sure stacked battery supplies will measure up on either count. You can always build the matching supplies later if you need to.

Per channel B+ current draw is only about 20mA so battery life should be OK.
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Old 22nd September 2013, 11:14 PM   #10
kevinkr is offline kevinkr  United States
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Mark, sent you a PM.
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