Frank and I were going to do such a design, but I decided to abandon the effort because it did not appear to me that the dedicated MC phono stage could match the noise performance of a high gain phono stage with an SUT.
I was considering paralleling as many as 4 6pi45 in the front end to try and get the noise down. It still would not have matched the noise performance of my Muscovite design with an SUT.
I got discouraged... There is a thread on the topic here if you dig.
I was considering paralleling as many as 4 6pi45 in the front end to try and get the noise down. It still would not have matched the noise performance of my Muscovite design with an SUT.
I got discouraged... There is a thread on the topic here if you dig.
A first linear MC gain stage (or transformer) is necessary for adequate noise performance.
Also versions of Arthur Loesch phono stage. I haven't heard it.
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I'll also mention Rod Coleman's shunt cascode circuit. I've built two versions so far, one with jFet front end and one that uses a step up transformer. He uses a jFet input stage on his, but the circuit is capable of so much gain I wonder if with care and the right tube(s) a two stage circuit could be used for MC.
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I'll also mention Rod Coleman's shunt cascode circuit. I've built two versions so far, one with jFet front end and one that uses a step up transformer. He uses a jFet input stage on his, but the circuit is capable of so much gain I wonder if with care and the right tube(s) a two stage circuit could be used for MC.
This has everything you'll ever want to know about the subject -
http://www.diyaudio.com/forums/diya...oise-thoroughly-modern-tube-phono-preamp.html
I'm 1/2 way through building one.
http://www.diyaudio.com/forums/diya...oise-thoroughly-modern-tube-phono-preamp.html
I'm 1/2 way through building one.
So it is transforers then (SUT)...
What about this with a MM tube Riaa after https://boozhoundlabs.com/products/bhl-audio-jfet-moving-coil-pre-preamp-phono-kit-2sk170
not tubes,but it´s simple anyway..
What about this with a MM tube Riaa after https://boozhoundlabs.com/products/bhl-audio-jfet-moving-coil-pre-preamp-phono-kit-2sk170
not tubes,but it´s simple anyway..
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Should be very good, with 30dB gain using a 2SK170 jfet. It also needs a good, low noise
power supply, so use theirs. https://boozhoundlabs.com/collections/all/products/power-supply-kit
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Found this on another site,would this work?
Just asking.
An externally hosted image should be here but it was not working when we last tested it.
Just asking.
Unison Research have the Simply Phono.. pure class A using 4 ECC83 double triodes suitable for MM and mid-high output MC cart's , it ain' t cheap though.
https://henleydesigns.co.uk/Simply-Phono-p1407
https://henleydesigns.co.uk/Simply-Phono-p1407
What on earth does that nonsense mean? Pure class A vs what? Class D?
Of course it cannot be suitable for anything but high output MCs. It is simply a standard, boring MM pre with a bit of extra gain and variable loading. Yawn.
Played with this years ago. Single and multiple paralleled E88CCs. A single with 30v of battery power for the input tube worked satisfactorily with a 0.3mV cart. 4 sections were okayish for 0.1mV. But then i am not so fussy about noise; it is a part of the vinyl experience and the pinkish tube noise i find inoffensive. Others, certainly differ.
As i don't particularly enjoy the sound of paralleled devices, sticking to 0.5mV and above carts is probably best. As for the input tube...either a 6S45p as Kevin suggested or a triode strapped E280F, or a C3g.
Ok take a chill pill , i was just trying to help by showing what the internet came up with after a search thats all doesn't mean i endorse it or that i'm an expert in such things ( unlike you obviously )
Ok point taken as i said i'm no expert when it comes to vinyl, guess they're just another snake oil vendor then .
Found this after another look ( don't shoot me if it's rubbish , as i said in previous post it's just what i found looking around the net )
http://tavishdesign.com/products/classic-...
sorry if link doesn't bring up the item direct click on the catalog to view it/them
http://tavishdesign.com/products/classic-...
sorry if link doesn't bring up the item direct click on the catalog to view it/them
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I use schematic below for mc phono amp.
Best of both worlds, low noise firststage and high headroom secondstage.
PL39 is for gain adjust with resistor to ground.
PL38 is input. you need to ad impedance circuit suitable for your cartridge.
Ronny
Best of both worlds, low noise firststage and high headroom secondstage.
PL39 is for gain adjust with resistor to ground.
PL38 is input. you need to ad impedance circuit suitable for your cartridge.
Ronny
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