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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 28th May 2020, 09:51 PM   #1081
Zen Mod is online now Zen Mod  Serbia
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Sony Vfet Illustrated build guide
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Old 28th May 2020, 11:47 PM   #1082
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by hirscwi View Post
I will be using K60 and J18 VFETs. Is it satisfactory to measure the Vgs using a Peak Atlas DCA75 or am I better to use the approach diagrammed by Mr. Pass?
Your all V-FET's have the same T-54 rank.
Imho Mr. Pass DUT diagram is more close to real work condition of the amplifier.
Make them hot for 15 minutes , temperature stabilise on the heatsink
then take Vgs measurements.

Sony VFET Amplifier Part 2

Greetings
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Old 29th May 2020, 12:15 AM   #1083
Soundhappy is offline Soundhappy  France
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Sony VFET Amplifier Part 2

Sony VFET Amplifier Part 2

Sony VFET Amplifier Part 2

You can use two 19 Volts laptop psu's connected together for bipolar
(-) (0 Volts, center tap ) and (+).
Two bench lab psu's ( current limited 1A max ) are always great tools.
My setup on the pictures
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Old 29th May 2020, 12:29 AM   #1084
hirscwi is offline hirscwi  United States
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Sony Vfet Illustrated build guide
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Originally Posted by Zen Mod View Post
Pass
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Old 29th May 2020, 12:32 AM   #1085
hirscwi is offline hirscwi  United States
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Sony Vfet Illustrated build guide
@soundhappy, I love your picture... it's worth 1000 words.

Thank you for the links. I'm excited to make this amp. It will be the most complicated that I've built.

Last edited by hirscwi; 29th May 2020 at 12:35 AM.
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Old 29th May 2020, 01:27 AM   #1086
Dennis Hui is offline Dennis Hui  Canada
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Sony Vfet Illustrated build guide
This is an excellent amp and well worth the effort.

Have fun with your build.
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Old 31st May 2020, 05:44 AM   #1087
AnthonyA is offline AnthonyA
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Sony Vfet Illustrated build guide
Anybody can give idea
Will this amp work optimal with 8 ohm 89 db jbl L166? Reasonably loud level



Thank you
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Old 31st May 2020, 11:53 AM   #1088
6L6 is online now 6L6  United States
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Sony Vfet Illustrated build guide
Absolutely
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Old 31st May 2020, 01:32 PM   #1089
AnthonyA is offline AnthonyA
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Schweet.. Thanks Jim
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Old 1st July 2020, 12:05 PM   #1090
Jim50hertz is offline Jim50hertz  United Kingdom
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Quote:
Originally Posted by Rodeodave View Post
Correct.

Q1 n-jfet k170
Q2 p-jfet j74

NPN for Q3 and PNP for Q4, so
ZTX450 for Q3 and ZTX550 for Q4

I can also confirm that Q5 (left position when looking at the pcb) must be P channel, so either 2SJ313 or FQP3P20. Q6 (right position) must be N channel, so either 2SK2013 or FQP3N30.
RodeoDave thanks for this. I'm ready for the first stage of power up.

Just to double confirm, on the ZTX450/550, the round side is the side with the writing on it?
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