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Electronic phono MC step up transformer
Electronic phono MC step up transformer
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Old 13th February 2018, 03:46 PM   #11
Koifarm is offline Koifarm  Netherlands
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A lot of people use accu when it is in use. When it is off the accu will be autocharged.
I use powersupply with tps7a47, no hum at all.
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Old 13th February 2018, 04:00 PM   #12
kamis is offline kamis  Serbia
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This circuit is too primitive for proper MC cartridge amplification.
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Old 13th February 2018, 05:53 PM   #13
lcsaszar is offline lcsaszar  Hungary
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Perhaps a grounded gate circuit would do better (similar to an I/V converter for a current-out DAC).
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Old 13th February 2018, 06:16 PM   #14
Freecrowder is offline Freecrowder  United States
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Electronic phono MC step up transformer
A lot of people use accu when it is in use. When it is off the accu will be autocharged.
I use powersupply with tps7a47, no hum at all.


What Is accu?
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Old 13th February 2018, 06:21 PM   #15
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by Freecrowder View Post
A lot of people use accu when it is in use. When it is off the accu will be autocharged.
I use powersupply with tps7a47, no hum at all.


What Is accu?
A rechargeable battery.
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Old 14th February 2018, 12:57 PM   #16
Sunsun22 is offline Sunsun22  Hong Kong
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I won't judge the performance of an amplifier from the circuit alone. This all started when my friend presented me a single tube DL92 preamp that he purchased from China at US$90. Yes, it is US$90 all in, totally built. The circuit is simple and I must say; without any modification, it sounds great. I started to work on it by changing a number of parameters and eventually built an improved version that blows away my Herron Audio VTSP-3 and WE437A DIY preamps.

I am using Erno Borbely's 320 phono amp and it is quiet, dynamic and musical. As a DIYer, you never satisfy and settle down therefore I am working on a tube phono. Since most tube phono are MM based, I am looking forward for a step up stage for my VDH Colibri MC cartridge. Good step up transformer are expensive therefore I am looking for an electronic step up stage. Since the 320 phono consists of two stages, I am thinking to use the first stage as step up with tube phono as second stage. Yet, all of this has to start with a MM phono stage that I still have not finalized. Will get more information before I start.

The Pacific pre-pre is simple and it could be one of the alternatives.
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Old 14th February 2018, 03:23 PM   #17
Koifarm is offline Koifarm  Netherlands
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From simplistic njfet riaa thread.
Simplistic NJFET RIAA
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Old 14th February 2018, 10:40 PM   #18
PRR is offline PRR  United States
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Quote:
Originally Posted by Sunsun22 View Post
...electronic phono MC step up module....
Moving Coil Cartridge Head Amps
http://bitsavers.trailing-edge.com/c...es/AN-0222.pdf - Fig 4 page 4

Moving Coil's very low resistance gets down in the Universal Voltage Hiss of most amplifying devices. Until recently, BJT gave lower hiss. Recent JFETs matched BJTs, but have become harder to find. The classic BJT designs are, IMHO, more likely to work well without careful procurement and selection.
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Old 1st March 2018, 02:51 AM   #19
Sunsun22 is offline Sunsun22  Hong Kong
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As discussed, I am posting the first stage schematic of my phono amp here. This is the 320 phono of Erno Borbely that I have been using it since 2011. A very articulate, quiet and dynamic phono that beats my ASR (old model).

I am thinking if I can use the first stage as MC stage for my tube phono project. Can anyone tell me is it possible to take the output at "TEST" point (Between R27 and R28) and feed it to a 47K MM tube phono amp?

Click the image to open in full size.
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Old 1st March 2018, 07:14 AM   #20
kamis is offline kamis  Serbia
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Quote:
Originally Posted by Sunsun22 View Post
As discussed, I am posting the first stage schematic of my phono amp here. This is the 320 phono of Erno Borbely that I have been using it since 2011. A very articulate, quiet and dynamic phono that beats my ASR (old model).

I am thinking if I can use the first stage as MC stage for my tube phono project. Can anyone tell me is it possible to take the output at "TEST" point (Between R27 and R28) and feed it to a 47K MM tube phono amp?

Click the image to open in full size.
Borbely phono preamp is an elaborate, high quality piece of elactronic. Why do you think that tube circuit is better than Borbely second stage ? The only thing you may get is softening coloration of tubes, problem with tubes choice, etc. It is a very bad idea from my point of view.
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