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
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
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!
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
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
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
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
Attachments
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.
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.
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OK perfect, now I suppose Salas will design a schematic for your 2.5mV output cartridge
The following schematic is suitable for your output cart but the NJFETs must be 8-9mA Idss
41db-Version 8,0-9,0 mA IDSS Post 1812 output cart 2-5mV
The HiMC circuit from the pdf link situated in post#1 should do for your 7.5mA fets.
Hi Everyone,
I have a .27mV cartridge (Denon 103R). My current phono pre (Vincent PHO-111)requires .29mV or .30 mV. Must turn up the preamp past 1 or 2 o'clock position to get good output from vinyl. Yet, still it sounds a bit thin.
Can you recommend a version of this phono preamp that will work with a .27mV cart output?
I thought the one on page #11 might be it, but don't know if there have been any changes to the design since then.
Also, what is a shunt power supply? Is it a must with the Salas phono pre?
Thanks,
Vince
I have a .27mV cartridge (Denon 103R). My current phono pre (Vincent PHO-111)requires .29mV or .30 mV. Must turn up the preamp past 1 or 2 o'clock position to get good output from vinyl. Yet, still it sounds a bit thin.
Can you recommend a version of this phono preamp that will work with a .27mV cart output?
I thought the one on page #11 might be it, but don't know if there have been any changes to the design since then.
Also, what is a shunt power supply? Is it a must with the Salas phono pre?
Thanks,
Vince
There is an evolution link you can find in post#1. Leads to a PDF instructions paper that has all you need. Make the HiMC and pre-pre from there, those will give you 63dB gain together (Vincent seems like 53dB). Also make the regulator. That is a parallel style (shunt) Mosfet regulator recommended and developed for this phono to full tone standards.