I simply do not find the time to finish the Cro Magnon.
It is an intellectual exercise anyway.
What i came up with is a DC coupled, balanced input for the Paradise.
Schematic soon. At least the principle.
It is an intellectual exercise anyway.
What i came up with is a DC coupled, balanced input for the Paradise.
Schematic soon. At least the principle.
I simply do not find the time to finish the Cro Magnon.
It is an intellectual exercise anyway.
What i came up with is a DC coupled, balanced input for the Paradise.
Schematic soon. At least the principle.
It is an intellectual exercise anyway.
What i came up with is a DC coupled, balanced input for the Paradise.
Schematic soon. At least the principle.
Here we go :
Advantages : Balanced input for good hum and common mode rejection
Base potential of both input at the same voltage so no DC into the cartridge
DC coupled, also in the emitter feeds, no elcaps
Less distortion because diffential
Disadvantage : 3dB more noise then Paradise with the same amount and type of input devices, can be solved with super low Rbb devices ( i think i found some that are not obsolete )
Advantages : Balanced input for good hum and common mode rejection
Base potential of both input at the same voltage so no DC into the cartridge
DC coupled, also in the emitter feeds, no elcaps
Less distortion because diffential
Disadvantage : 3dB more noise then Paradise with the same amount and type of input devices, can be solved with super low Rbb devices ( i think i found some that are not obsolete )
Attachments
Very good... anyway the paradise is so silent, +3db might not be an issue.
No. With low Rbb transistors it will be even more quiet. We could massive parallel ala. Accuphase.
I will build a simple version of the input stage for testing.
I will build a simple version of the input stage for testing.
I don't want to interject with this, but I felt like adding my two cents here.
I already tried months ago the input stage you just drawn here and it will be hard to:
1) keep the offset in pair
2) find proper RIAA curve
3) keep low noise
Granted poin 1) and 2) are met, point 3) will require serious paralleling of parts.
What I don't understand though, is that the reference to support the paralleling thought comes from a piece of equipment (Accuphase) that is NOT a reference soundwise whatsoever and that I would NOT consider the pinnacle of sound and that I would NOT buy myself.
One more time Paralleling devices will yeald to dull sound, lifeless and nuances will be gone.
Just like paralleling caps on the RIAA or using biasing El cap on the input stage.
If now, you would refer to something like Boulder or one the same sonic league, then your statement would probably be supported with more value!
However like I said these are my two cents...feel free to take it or drop it
I like your interjections....
Why Boulder ? Does it also have parelleled input devices ?
As for paralleling caps, the only issue I see relates with lead lenght.... Some prised cap builders even promote the idea... see multicap MultiCap RTX Capacitors
"This unique cap employs internal bypassing via ten equal yet separate windings connected in parallel."
Why Boulder ? Does it also have parelleled input devices ?
As for paralleling caps, the only issue I see relates with lead lenght.... Some prised cap builders even promote the idea... see multicap MultiCap RTX Capacitors
"This unique cap employs internal bypassing via ten equal yet separate windings connected in parallel."
I disagree, no dull sound from paralleling.
What is a low Rbb BJT or for what its worth a high Gm JFet ?
Lots of transistors in parallel, OK on one chip.
You are on another mission anyway.
Your super high Gm Intefet parts allow a single gender diffential amp to work with low noise.
Topology like Bob Cordells Vinyl Track or Michael Böressens One Shot RIAA:
What is a low Rbb BJT or for what its worth a high Gm JFet ?
Lots of transistors in parallel, OK on one chip.
You are on another mission anyway.
Your super high Gm Intefet parts allow a single gender diffential amp to work with low noise.
Topology like Bob Cordells Vinyl Track or Michael Böressens One Shot RIAA:
I never heard the Accuphase but virtually all German reviews gave it reference class.
The measurements done by a friend of mine that runs a state certified lab where perfect.
Super low noise and no measurable distortion. Perfect RIAA.
The Boulder ? I think that had really poor signal noise but i will check that again.
The measurements done by a friend of mine that runs a state certified lab where perfect.
Super low noise and no measurable distortion. Perfect RIAA.
The Boulder ? I think that had really poor signal noise but i will check that again.
Atkinson says it is superb but it isn´t.
Boulder Amplifiers 1008 phono preamplifier | Stereophile.com
64.75dB S/N A weighted is crap.
The Paradise is at least 12dB better.
That this does sound more " quiet" and subjectively maybe not as " bouncy" is no wonder.
Anyway, the Paradise builders report great dynamics and punch.
Boulder Amplifiers 1008 phono preamplifier | Stereophile.com
64.75dB S/N A weighted is crap.
The Paradise is at least 12dB better.
That this does sound more " quiet" and subjectively maybe not as " bouncy" is no wonder.
Anyway, the Paradise builders report great dynamics and punch.
IMO atack (what happens at start of notes) especialy with most difficoult wood wind instrument is staghering by miles the best I have eard.
Any way you go Bjt or Jfets I am willing to try the balanced.
And a version for the Sumico Blue point (lower gain) if possible...
Any way you go Bjt or Jfets I am willing to try the balanced.
And a version for the Sumico Blue point (lower gain) if possible...
I just have drawn up the most simple implementation.
It is a pre-pre. Cap coupled output. This is only a prove of concept.
It is a pre-pre. Cap coupled output. This is only a prove of concept.
I do like that input stage...🙂) I do think the input will silent enough with the 327,337 transistors, but of-course if you have better ones, I for one would like to hear about it..🙂
wel, you will laugh but i will build the prototype with BC140-160.
Just for the fun of it. They measured great on the curve tracer.
The PNP has tremendoes high early voltage and they are very complimentary.
I am also now getting some Zetex FMMT618, 718.
When i interpret the data correctly they should have Rbb at around 2Ohm AND they have high Hfe.
Just for the fun of it. They measured great on the curve tracer.
The PNP has tremendoes high early voltage and they are very complimentary.
I am also now getting some Zetex FMMT618, 718.
When i interpret the data correctly they should have Rbb at around 2Ohm AND they have high Hfe.
