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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 3rd February 2017, 01:54 PM   #41
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by mr_whocares View Post
isn't more safe to use 50v caps for the psu? i remember to see somewhere this recommendation and 6l6 has it on the psu diagrams as well.

Vfet amp work with 28 Volts so 35 V rated psu caps are safe.
50 V caps cost more but they are safe for sure.
Kindest regards
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Old 3rd February 2017, 02:52 PM   #42
delecoy is offline delecoy  United States
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Would a 50V cap last longer compared to a 35V in a 28V circuit?
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Old 3rd February 2017, 03:17 PM   #43
Soundhappy is offline Soundhappy  France
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Originally Posted by delecoy View Post
Would a 50V cap last longer compared to a 35V in a 28V circuit?
I have compared lower voltage caps with higher version and 50V have stronger mechanical construction they are biger heavier
and look more resistant to time evenements : humidity, temperature changes, corrosion.
Temperature factor is important as well i like 105 C versions.
My humble opinion
Btw snubbering diodes bridge are interesting option to get quiet psu.
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Old 3rd February 2017, 05:58 PM   #44
mr_whocares is offline mr_whocares  Germany
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...
Btw snubbering diodes bridge are interesting option to get quiet psu.
what do you propose as snubber for the diodes; just caps (10nf ?) parallel to the diodes or something different?
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Old 3rd February 2017, 06:12 PM   #45
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by mr_whocares View Post
what do you propose as snubber for the diodes; just caps (10nf ?) parallel to the diodes or something different?
You can modify your bridge with snubbering technique at the end. It's easy modyfication.
Use cap with resistor for each diode.
I can't give response that must be tested individualy for your transformer ringing parameters.
Read in appriopriate snubber thread , find articles
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Old 3rd February 2017, 06:42 PM   #46
Soundhappy is offline Soundhappy  France
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Link is :
CheapoModo: quick and dirty transformer snubber bellringer jig

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Old 4th February 2017, 08:21 AM   #47
mr_whocares is offline mr_whocares  Germany
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many thanks!
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Old 13th February 2017, 10:22 PM   #48
Brumjam is offline Brumjam  United Kingdom
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My F6 power supply is outputting +/- 26v which is at the low end of Nelson's stated operating voltage for the VFET amplifier. Will the VFET amp function ok if supplied with 26v? I note the values of R15 and R16 can be changed, but I don't see the point if 26v is sufficient.
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Old 13th February 2017, 10:27 PM   #49
Soundhappy is offline Soundhappy  France
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parallel to the diodes or something different?
Something different is snubber directly connected on the psu toroid secondary
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Old 14th February 2017, 01:12 AM   #50
Analogico is offline Analogico  Portugal
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Brumjam,

In Papa's words:

"I used an ordinary First Watt type supply design, documented elsewhere, with 22 VAC transformer secondaries to provide +/-28 volts DC. 24 or 25 VAC will work fine, running a little hotter. The minimum recommended for this amplifier is +/-27 volts, but it will run OK with a little lower supply if you adjust the values of R13 through R16 for lower voltage."
 

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