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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 5th July 2020, 02:55 PM   #1131
Jim50hertz is offline Jim50hertz  United Kingdom
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Thanks Ben

The more I thought about it the more it made sense that the stand offs go with the screws. It struck me as well that the standoffs may not be too fond of the heat from the iron.

Anyway suffice to say I’ve built the amp up and am biasing one channel now. Got 100mv across r32, -6mv at the outputs and around 60mv at t18. The lid is on and the amp is pretty warm. Will leave it for a while and see what’s what. Seems pretty stable right now though.

I’ll get to the next channel in an hour or so.
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Old 5th July 2020, 03:47 PM   #1132
Dennis Hui is offline Dennis Hui  Canada
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Sony Vfet Illustrated build guide
Those are excellent numbers.
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Old 5th July 2020, 04:41 PM   #1133
Jim50hertz is offline Jim50hertz  United Kingdom
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Talked too soon! Fluctuating. I’m onto the other channel.
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Old 5th July 2020, 05:28 PM   #1134
RainfallSky is offline RainfallSky  Russian Federation
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Quote:
Originally Posted by Jim50hertz View Post
Thanks Ben and Dennis, that's very helpful!

Unlike the pics on page 1 I've inly got 9 nylon insulators. I'm guessing the intention is to use these for the legs of the VFets and skip them for the screws as the heatsink is anodised and the screws don't risk coming into contact with it in the way they are oriented?

Should I order more of these or forge ahead? I do know this is a really silly question....
I bought this nylon insulators:
50pcs M3 M4 M5 M6 M8 White Nylon ABS Non Threaded Spacer Round Hollow Standoff Washer ID 3mm4mm 5mm 6mm 8mm PCB Board Screw Bolt|screw bolt|8mm boltbolt 8mm - AliExpress
Go for (M3 ID 3mm) + (5mm)
Good for M3 bolts/screws.

I also bought M4+5mm from this seller. And they appear a bit wider than 7mm and did not fit.. ) so don't buy them.

Quote:
Originally Posted by Dennis Hui View Post
Perhaps some insulating tubing for the pins? You would
want something that can take a bit of heat from soldering the pins.
Nylon probably could melt if VFET pins touch it when solder.
I also bought PTFE tube I can cut.
1Meter 1mm 2mm 3mm 4mm 6mm 8mm PTFE Tube For 3D Printer Parts Pipe Bowden J head|for 3d printer|teflon tube 4mmteflon tube 6mm - AliExpress
Go for (ID2mm OD3mm) + only color is White.
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File Type: jpg IMG_2026.jpg (568.9 KB, 223 views)

Last edited by RainfallSky; 5th July 2020 at 05:32 PM.
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Old 6th July 2020, 12:01 AM   #1135
Ben Mah is offline Ben Mah  Canada
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Sony Vfet Illustrated build guide
Heat shrink for the pins. Easy peasy.
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Old 6th July 2020, 06:30 AM   #1136
Jim50hertz is offline Jim50hertz  United Kingdom
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Ok I’ve got a working amp. Offset on 1 channel is pretty steady at 10mv, the other channel sits around 30mv. I may try to dial this channel in a little more.

Anyway last night I started with super cheap speakers and worked up to my main set. Sounds great! More listening today.

Big thanks to Papa Nelson Pass for sharing his stash and designing another incredible amp.

Thanks to Jim for this build guide. Sterling work as ever and an invaluable resource.

Special thanks to Dennis Hui and Ben Mah for getting me through the build without releasing the unobtanium 40 year old magic smoke, and for patiently answering all of my questions. I owe you guys a beer. When I make it to Canada I’ll deliver on that.

Last edited by Jim50hertz; 6th July 2020 at 06:38 AM.
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Old 6th July 2020, 06:40 AM   #1137
Ben Mah is offline Ben Mah  Canada
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Old 6th July 2020, 10:34 AM   #1138
Dennis Hui is offline Dennis Hui  Canada
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Sony Vfet Illustrated build guide
Congratulations! Please post some photos when you have a chance. (Or as the
Mighty Zen Mod would say, "No Porn, no glory" )
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Old 7th July 2020, 09:13 AM   #1139
Jim50hertz is offline Jim50hertz  United Kingdom
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Pics here. One side has under 10mv DC offset after warm up, the other is around 25mv. I may try to tweak this down a bit once the amp settles in.

Click the image to open in full size.
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Old 7th July 2020, 09:24 AM   #1140
Zen Mod is offline Zen Mod  Serbia
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Sony Vfet Illustrated build guide
if these numbers (10 and 25mV) are in temp equilibrium, then you're done

chill, enjoy, go to surf

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