Looking for recommendation for Phono Stage
#46 Re: Looking for recommendation for Phono Stage
Thanks. So obviously looking for the squareness of the wave, but even that is a very visual judgement.
Totally agree ears are the final arbiter but if I'm going to try half a dozen options it will get quite difficult to compare I reckon. Still, if that's the best way I'm good. Perhaps 2 breadboards, winner stays on, keep trying to improve...
Totally agree ears are the final arbiter but if I'm going to try half a dozen options it will get quite difficult to compare I reckon. Still, if that's the best way I'm good. Perhaps 2 breadboards, winner stays on, keep trying to improve...
#47 Re: Looking for recommendation for Phono Stage
Well, other than ears, the best way is you spend £15k-£20k on up to date audio analyser from AP, R&S or Keysight. You will be surprised how good a first step a square wave is though.
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#49 Re: Looking for recommendation for Phono Stage
I do something similar on the one I use. Mono the input and output with a combining connector and then modify one channel - swap back and forth.
Cheers,
Stephen
#50 Re: Looking for recommendation for Phono Stage
Today's location for audio circuit thinking...
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#51 Re: Looking for recommendation for Phono Stage
That's all very well, but have you got a toilet where you can sit with a pad of paper, a pencil and a calculator ?
"Once you find out ... the Circumstances ; then you can go out"
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#52 Re: Looking for recommendation for Phono Stage
Sitting on the toilet, working it out with a pencil ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#54 Re: Looking for recommendation for Phono Stage
I thought Rudolf was back for a moment then.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
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#55 Re: Looking for recommendation for Phono Stage
Careful! Say his name three times and he’ll appear.
The world looks so different after learning science. For example, trees are made of air, primarily. When they are burned, they go back to air, and in their flaming heat is released the flaming heat of the Sun which was bound in to convert air into tree.
#56 Re: Looking for recommendation for Phono Stage
Strictly speaking Shane, the Duck-billed Platypus is not the only egg laying mammal in the world... there is another called an Echidna...
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#57 Re: Looking for recommendation for Phono Stage
This is true, but whoever heard of an echidna that ate custard?
The world looks so different after learning science. For example, trees are made of air, primarily. When they are burned, they go back to air, and in their flaming heat is released the flaming heat of the Sun which was bound in to convert air into tree.
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#58 Re: Looking for recommendation for Phono Stage
Eric does.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
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#59 Re: Looking for recommendation for Phono Stage
Or even, just the toilet...IslandPink wrote: ↑Tue Jan 22, 2019 9:08 pm That's all very well, but have you got a toilet where you can sit with a pad of paper, a pencil and a calculator ?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#60 Re: Looking for recommendation for Phono Stage
Ooh that was a good week skiing. No snow since Dec 22 - pistes in remarkably good nick considering.
Now back to the important stuff. No not work, the next amp design.
Thomas Mayer also likes the D3A - http://vinylsavor.blogspot.com/2012/12/ ... h-d3a.html
"The low plate resistance makes this tube very suitable for transformer coupling. With a step down transformer, for example Lundahl LL1692A in 3.5:1 configuration or LL1660 in 4.5:1 the tube is perfect to drive a 600 Ohm LCR RIAA network. In such a configuration there would even be some gain left after the EQ network. With a step up transformer after the RIAA, for example Lundahl LL7903 in 1:4 confguration this could be boosted up for further amplification in a second D3a stage using another step down transformer for low output impedance. With a Lundahl LL2745 wired 2.8:1 at the output such a 2 stage phono preamplifier would have a MM gain of about 46 dB with an output impedance of less than 300 Ohms. This gain can be brought up to suitable levels for moving coil cartridges with a MC step up transformer."
Now back to the important stuff. No not work, the next amp design.
Thomas Mayer also likes the D3A - http://vinylsavor.blogspot.com/2012/12/ ... h-d3a.html
"The low plate resistance makes this tube very suitable for transformer coupling. With a step down transformer, for example Lundahl LL1692A in 3.5:1 configuration or LL1660 in 4.5:1 the tube is perfect to drive a 600 Ohm LCR RIAA network. In such a configuration there would even be some gain left after the EQ network. With a step up transformer after the RIAA, for example Lundahl LL7903 in 1:4 confguration this could be boosted up for further amplification in a second D3a stage using another step down transformer for low output impedance. With a Lundahl LL2745 wired 2.8:1 at the output such a 2 stage phono preamplifier would have a MM gain of about 46 dB with an output impedance of less than 300 Ohms. This gain can be brought up to suitable levels for moving coil cartridges with a MC step up transformer."