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Old 21st January 2012, 10:23 AM   #7141
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Have no doubts
I made the thing and it worked first time.

I am using 24 V suply rails as I was going to use bateries as suply.
And it sound good.
I am shure proper version sound even beter
I am using 4 J fets with 33R source resistor for each
did not bother with the regulator I just put the transistor bit on it.

If I managed any body can thats for shure
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Old 21st January 2012, 09:14 PM   #7142
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Quote:
Originally Posted by merlin el mago View Post
I want to make the Low MC pre-pre 20dB 7mA K170BL as per psgr PDF but I have several doubts:

-How can be modified to use BiB regs instead 7809
-I have 3 SK170BL 6.73mA Idss & 1 SK170BL 6,74mA Idss, I believe isn't necessary to modifie the schematic values, right?
bump
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Old 21st January 2012, 09:18 PM   #7143
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Don't modify anything, use it as given.
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Old 21st January 2012, 09:51 PM   #7144
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OK
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Old 25th January 2012, 10:13 PM   #7145
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My latest phono build is in progress - V1.2r regs and 60db stage on the same veroboard. I'm yet to test the regs for oscillcation but I have built them as compact as I can. I will report back. And I've just ordered Teflon RIAA caps from ebay - from what I've read they are much better than other types, my current stage uses polystyrene. Can't wait to get it running!
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Old 29th January 2012, 11:19 AM   #7146
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Like many others I sold all my vinyl over 20 years ago. However, I have just bought a Technics SL-DL1 for 12.50. All I need now is some vinyl to play on it. And a phono stage of course - the reason for posting.

I have read about 50 pages of the thread and there is a lot of very useful stuff. Thanks Salas already. I'm looking for a schematic for a 2.5ma mm cartridge. It will be fed into a Hypnotize B1 buffer. There is one for a 3.5ma output in post 417 and a 24V shunt reg somewhere. Would this one be the best one to use, or has there been an update which I haven't found yet?

thank you
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Old 29th January 2012, 11:53 AM   #7147
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A Bit of progress on my side.
Maybe it shuld be on reflector tread ...
But the 2 go hand in hand so nicely

I just had same IRF640 and replaced the IRF610 on the reflectors.

Much much beter now much more stable.

I have also taken of the 1u MKS and changed them with same EVOX .68U they are a bit big so soldered on the botom of the board
Big difference there if you trow money at it start here
The sound stage is much more solid a bit brighter Hi frequency maybe.
A uge improvment.

I am now going to build the proper one but before I do that I will listen to a few traks while I write what is on post 7143 100 times .

I had same trubles whit the power suply before the Reflektors but got oround that with sometink I have seen on another tread.

I have fitted a common mode coke at the output of the 317 Regulator board.
Not ideal to start with a poor power suply but maybe it could help
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Old 29th January 2012, 11:59 AM   #7148
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Quote:
Originally Posted by df_genius View Post
My latest phono build is in progress - V1.2r regs and 60db stage on the same veroboard. I'm yet to test the regs for oscillcation but I have built them as compact as I can. I will report back. And I've just ordered Teflon RIAA caps from ebay - from what I've read they are much better than other types, my current stage uses polystyrene. Can't wait to get it running!
Polysterenes are also very good, RIAA caps important thing is tolerance & accuracy as stated by RCruz. If yours styrenes are 1% surely sounds better than teflons 5% or more tolerance.
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Old 29th January 2012, 12:01 PM   #7149
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Quote:
Originally Posted by chalkandtalk View Post
Like many others I sold all my vinyl over 20 years ago. However, I have just bought a Technics SL-DL1 for 12.50. All I need now is some vinyl to play on it. And a phono stage of course - the reason for posting.

I have read about 50 pages of the thread and there is a lot of very useful stuff. Thanks Salas already. I'm looking for a schematic for a 2.5ma mm cartridge. It will be fed into a Hypnotize B1 buffer. There is one for a 3.5ma output in post 417 and a 24V shunt reg somewhere. Would this one be the best one to use, or has there been an update which I haven't found yet?

thank you
You need to buy a batch of SK1760BL and measure Idss and post here the results so Salas will let you know wich Idss use and exact schematic for your 2.5mV not ma MM cart.

Last edited by merlin el mago; 29th January 2012 at 12:04 PM.
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Old 29th January 2012, 12:06 PM   #7150
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Measured all my sk170s yesterday. I have 8 which measure 7.5ma Idss.
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