No, but I see little difference from making a Vbe up from ground to bias a common base stage. the second one does not have this problem. The chance of me buying a new MC cartridge are slim, so just asking.
i posted this circuit some time ago but did not build it. I have not seen scots circuit used for cartridges before but people have asked me if a common gate FET MC stage is possible and scott found the solution.
Joachim I agree there is something with this "not so perfect" thing, there is something special with the asymmetric, it also creates even order distortion that is much more benign for our ears.
I have now started a tube amplifier project, is going to be my first tube amplifier so I am very excited about it, in the past I thought symmetry is the "answer" to perfection of Audio Nirvana, but in this design we won't see so much of it, it seems when one becomes older one matures also in thinking and general life philosophy and the same goes for audio designing philosophy.
Carbon rods, are these similar to composite resistors which are known to be noisy, sensitive to humidity and can change and at worst case irreversible changed in the resistance when they are soldered and heated too much?
Carbon or graphite, it is the different name for same thing and very similar to the lead pen, yes sala you could perhaps install led pen in your amplifier? 😉
Cheers Michael
I remember there were naked graphite rods for designer's mechanical pencils, better look for such so to avoid the pain of extracting them from wooden pencils. They are good for speaker crossover power resistors. Low Ohmic for amps and too big.
I do remember from many many years ago in my youth back in school I took a led pencil and run high current through it, it started to smoke, the conclusion was it "worked"! 😀
Well, in fact from safety point of view composite resistors are in fact very dangerous if over heated and start to burn, it's almost explosive and not recommended where reliability and safety is a concern as the flame development is so hefty it can make anything around start to burn so I hope people who use these resistors in loudspeaker which is often made of wood take this into consideration and I am not joking.
Cheers Michael
Well, in fact from safety point of view composite resistors are in fact very dangerous if over heated and start to burn, it's almost explosive and not recommended where reliability and safety is a concern as the flame development is so hefty it can make anything around start to burn so I hope people who use these resistors in loudspeaker which is often made of wood take this into consideration and I am not joking.
Cheers Michael
well you know, my safety consultant told me once there was a guy who brought home his new mega amplifier with huge output wattage which he connected to his loudspeaker with shy power ratings but which of course had a nice x-over with composite resistors speced for the loudspeakers max rating, now his amplifier was made for driving an arena speakers set-up, the volume knob had three gradings in ascending order "Min", "Max" and "Are you nuts?".. and of course he had to find out the truth.
The story tells also he had to call the fire-brigade to quench the fire, afterwards one of the fire-brigade men asked him what caused the fire and the guy told he just bought a new amplifier he wanted to test.. the fireman asked the guy "are you nuts?"
The story tells also he had to call the fire-brigade to quench the fire, afterwards one of the fire-brigade men asked him what caused the fire and the guy told he just bought a new amplifier he wanted to test.. the fireman asked the guy "are you nuts?"
Jürgen made them so they compensate for the temperature coefficient of dome tweeters. they are big, more then 10cm long and in an impregnated paper tube. but somehow he is not totally happy with them. other people love them.
Today i will send some photos and measurements.
First i show the copper cased coils, the inductive RIAA, the PSG and the Hiraga Optime.
Today i will send some photos and measurements.
First i show the copper cased coils, the inductive RIAA, the PSG and the Hiraga Optime.
Attachments
Here come some measurements of the Hiraga Optime with Telepath MM RIAA stage. Distortion is 2nd only, monotonic. OHH sorry, somehow the files got over 1MB big. I try later or tomorrow. i plan to listen a bit today because i also now mounted coils on the powersupply of the Telepath and i am eager to hear the result.