Nelson’s "B1 Buffer Preamp" document says the buffer can use an external PS from 18-24VDC. Whether a resistor change is necessary (w/24V) I cannot comment on.
Cheers
Cheers
Headroom?
Maybe lower distortion?
Feeling better running devices at higher voltages?
All of the above?
Do you see any disadvantages?
I personally don't.
Maybe lower distortion?
Feeling better running devices at higher voltages?
All of the above?
Do you see any disadvantages?
I personally don't.
Ok, thanks. I was just curious if I should try 24V as well, even if your statement was just "you thought it sounded better". Obviously 24V has no detrimental effects in your experience. Wasn’t judging your use of 24V ….
Cheers, Pete
Cheers, Pete
No real advantage other than I needed 24v for my leach phono stage which is sharing the power supply. One of the inputs to my b1 is the leach which requires 24v.
This is a probably a question for Papa but will changing the voltage change the distortion spectrum? i.e. the proportions of 2nd and higher harmonics? Does it change the sound in that way? I have seen that the H2 device he designed to explicitly adust such a distortion mix was adjusted by tweking the supply voltage.
Imagine if you could have a tube B1 run at let's say 120 - 200 V.
Imagine the effortlessness and the drive that this will bring.
And the silky sound.
Imagine if you could have JFets doing the same, the clarity, the air.
Alas, both approaches have their limitations, so we take the middle ground - run SK170 (or SK369 in my case) close to their limits and not worry about semantics.
Imagine the effortlessness and the drive that this will bring.
And the silky sound.
Imagine if you could have JFets doing the same, the clarity, the air.
Alas, both approaches have their limitations, so we take the middle ground - run SK170 (or SK369 in my case) close to their limits and not worry about semantics.
Hi, I need comments about PIO russian caps regarding fitting on (100,101,200 & 201) board and sound improvement. Any picture is very much appreciated. TIA
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in post #4 under
More FET noise measurements (for EUVL)
are some interesting hints.
also of interest in this case are this threads:
Some other Source Follower Configurations
B1-Turbo on a Chip
NJFETs for Source Follower Applications
https://www.diyaudio.com/forums/sol...mance-source-follower-module.html#post2336629
https://www.diyaudio.com/forums/hea...ltra-low-noise-suggestions-3.html#post5606660 (post #25-30)
B1 JFET alternatives list
https://www.diyaudio.com/forums/sol...e-low-noise-amplifier-lna-13.html#post2192239
Ultra low noise amp with JFET's - How to reduce the THD ??
IF3601 IF3602 Ultra Low Noise JFETs
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Hi, I have now played for 3 days.
But last night I lost sound i right speaker.
I tapped the Jfets in right canal, sound come back for awhile. Then lost it again.
1- Can it be that the Jfets is overstressed (damage) because I use 100R as output resistor and my crossover is at 20K (next after B1)?
2- Can it be that I have put my Jfets very close to PCB ( short legs ), and damage them then solder them ?
Frank
But last night I lost sound i right speaker.
I tapped the Jfets in right canal, sound come back for awhile. Then lost it again.
1- Can it be that the Jfets is overstressed (damage) because I use 100R as output resistor and my crossover is at 20K (next after B1)?
2- Can it be that I have put my Jfets very close to PCB ( short legs ), and damage them then solder them ?
Frank
Yes, tapping them suggests a cold solder joint. Reflow the solder around the legs of the 'bad' JFET. Make sure you heat the pad and not just the solder.
Yes I solder proely first time ( I think ). I dont think ther is cold soilderpoints but I will look tomorrow. New Jfets are also on the way.
do not think, this time
those things are hard to confirm with eyes; repeating procedure (properly) is dilemma solver
those things are hard to confirm with eyes; repeating procedure (properly) is dilemma solver