Thanks for everything, Wayne,🙂
But my I ask you to be more precise, what can I do for bettering this equipment?
Not that it would not be good enough for now.😀
So I know, not the type GR or BL matter really, but actual Idss of devices. (GR=2,6..6,5mA, BL=6,0..12mA V=10,0..20,0mA)
What do you advice to me (us)?
Forgive me, I can not english and electronics as well.
I read it now:
But my I ask you to be more precise, what can I do for bettering this equipment?
Not that it would not be good enough for now.😀
So I know, not the type GR or BL matter really, but actual Idss of devices. (GR=2,6..6,5mA, BL=6,0..12mA V=10,0..20,0mA)
What do you advice to me (us)?
Forgive me, I can not english and electronics as well.
I read it now:
80-90mV across the sors of the input jfets are to high. There must be about 65mV at 22 ohm if You use +3db gain.
I'm confused.
You say 65 mV across 22ohm it is 3mA, so it can't be BL type, as Wayne said it earlier.😕
Google képkeresési találat: http://wfiles.brothersoft.com/l/little-orangutan_192071-1680x1050.jpg
You say 65 mV across 22ohm it is 3mA, so it can't be BL type, as Wayne said it earlier.😕
Google képkeresési találat: http://wfiles.brothersoft.com/l/little-orangutan_192071-1680x1050.jpg
The upper base resistor on the cascode was last a 7.3 K Ohm to give a bit higher voltage for the 2SK170 inputs. No more than 15 volts for noise to be best. I never really like Q15 the inverting buffer in the front end but besides keeping the phase correct it may actually contribute to the sound in a positive way. You could try to just bypass it if you don't care about phase or swap cartridge leads.
Gain setting is -4 and -10dB because it is more than I need.
I using an Ortofon MC10 Super.
They say it has 0.3 mV output at 1000Hz/5cm/sec.
I using an Ortofon MC10 Super.
They say it has 0.3 mV output at 1000Hz/5cm/sec.
I said, that I'm stupid to electronics.
This is exactly with that 80mV more, which is at across the resistor.
So if I understand you correctly, If I change R18 10k to 7.3k or something, taking account on that FETs don't look higher than 15V, I will closer to the Audio Nirvana?
Higher VDS=Flatter curves portion for voltage bias midpoint, less Ciss. More gate leakage current. More mW, more chance of hot carriers to occur.
Could be.
But it is still pretty darn good.🙂
I don't worrying so much about noise issue.
I hear only a little bit more hiss, near tweeters, if I switch to XOno.
Xono has high flat gain attributed to first stage dominating well over the consecutive stages keeping SNR as high as possible. Uses the head amp concept to strong effect.
When the wizard's assistant says up to 15V is safe then its from the horse's mouth, no need to doubt. There should be some mA roof for that also that keeps the dissipation in check too I would guess.
After all, I can easily try out the two opposite extremes. (because of the sockets)
We say, I search some GRs at about 50-60 mA, and some BLs with higher mA, than there are those GRs, now in the circuit.
We say, I search some GRs at about 50-60 mA, and some BLs with higher mA, than there are those GRs, now in the circuit.
I would not use BLs higher than 70% IDSS and 75mW dissipation each, but better ask Wayne what was the roof in the better units regarding the head amp.