DIY Sony VFET Builders thread

Wiring pics

In spirit of pictures, here’s my ‘best of’ from wiring...

Definitely pays to plan ahead at this stage. Also, more than one way to skin a cat.
 

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codyt,

Congratulations on getting the DIY Sony VFET amplifier up and running!

Thanks for alerting the community about the PCB silkscreen error, and hopefully others will have smooth sailing based on your experience.

Now sir enjoy the music. 🙂
 
Thanks everyone.

@rafa, they are little thermal caps that my jfet ‘dealer’ throws in the box every time I buy a few Toshiba’s. They are meant to aid in the thermal coupling of the two devices, just like zip ties or heat shrink are often used. Not necessary, but I figured I’d use them since I had them.

To be honest, they may be a bad idea being in such close proximity to the Edcor. I slipped them on and off while I was doing my quick measurements earlier and didn’t see any changes, so who knows.
 

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Tip from Jim. Remove label from the Arctic silver thermal goo. You’ll see it’s 8 mL to start. Use 4 mL per side. My weapon of choice spreading it is a razor blade I had on the bench. Also, figure out where you’re going to screw it down before spreading the goo.
 

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I’m putting a little bend in the pins on the quick disconnects terminal blocks to fit in the front end boards. Note, the terminal blocks are not in the kit. They’re from my stash.
 

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The little power board creature is sprouting limbs.

Other boards are mounted. I’ll pick up the build again tomorrow evening.
 

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Wow, you guys are FAST! So many posts in the last day... great to see. 🙂

While I'm still waiting for chassis and some time to fire up the soldering iron, at least I've been able to noodle on some aspects of this build... and I remembered a special box that I had tucked away. I always knew I'd find a good use for these beauties (future upgrade, will build the stock kit first, then start work on a front end of my own design)... 290kHz and +27dBu's worth of quadfilar deliciousness. Roughly the same vintage as those Sony VFETs, too.
 

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Last edited:
You have a part number for this?

Coolnose nailed it. The breakaway ones are nice to work with, and hold all the pin receptacles lined up and square for you while soldering.

One possible source:
Mill-Max p/n 310-43-124-41-001000
Mouser p/n 575-3104312441001000
$2.90 for a 0.1" SIP strip of 24 pin receptacles. Perhaps a bit more expensive than other sources, but I've bought these ones in the past and they work fine.