DIY Sony VFET Builders thread

[TungstenAudio]

The boards are stuffed. The chassis is in France.

That photo looks eerily like my own workplace, a few hours from now. 😉

My chassis was finally evicted from Charles de Gaulle, and is now making its way through the US. 😛

 

[hifiZen]

Don't forget when soldering in your front-end JFETs to leave the leads on the long side for easy de-soldering and recovery later. Best to do what you can to preserve these rare creatures in case you wish to re-use them, such as on a new front-end design. Or, you could socket them with machined pin sockets (which is what I will probably do).

 

[Soundhappy]

Slowly starting to look like an amp...

Any progress update ? How much is heatsinks temperature after 1 hour ?
Hot or very hot ?
BTW thermal paste included in the kit that is "take great care of the details" 😀

 

[enochRoot]

And do those NP signed tested stickers yellow/brown/burn when this baby is fired up?

 

[codyt]

Do you mean I wasn’t supposed to peel them off?

Just a little miscellaneous wiring today. Screws should arrive tmrw. Taking the day off work so I can focus 🙂

 

[noelectrix]

How much is heatsinks temperature after 1 hour ?
Hot or very hot ?

I´m interested too, but, well, approx 60 Watt for 30cm x 17cm heatsink should be ok..

 

[seanny]

Do you mean I wasn’t supposed to peel them off?

Put a coat of clear nail polish over it.

 

[Soundhappy]

I´m interested too, but, well, approx 60 Watt for 30cm x 17cm heatsink should be ok..

Yes heatsinks with all chassis looks comfortably oversized 🙂

 

[zman01]

Or, you could socket them with machined pin sockets (which is what I will probably do).

You have a part number for this?

 

[coolnose]

Something like this:

https://electronics-diy.com/store/40-PIN-Machined-Break-Away-Female-Header-Connector.jpg

 

[oreo382]

Soldering tips from a Pace HiRel course taken long ago. Clean pads and leads with lint free wipes and 99% Isopropyl,never use erasers etc. Flux all joints "flux is your friend".Solder tip about 650F,use SN63/37 eutectic solder (this was long ago but lead free is a pain in the As#).Clean residue with Isopropyl (acid brush works good).

 

[adason]

just fired up mine, it works
irf250 is rather hot, but all voltages are as supposed to
i guess i am not accustomed to run things this hot

 

[codyt]

just fired up mine, it works
irf250 is rather hot, but all voltages are as supposed to
i guess i am not accustomed to run things this hot

Awesome! Did you measure voltage at R2 and ground to verify the 20v?

 

[adason]

yes, started with P1 in the middle, then had to move it just a little to the right

 

[codyt]

Perfect, that’s good to know. I centered mine before installing, as I was unclear if they were shipped with correct adjustment.

 

[noelectrix]

just fired up mine

c'm on gift us a little vid ; )

 

[Soundhappy]

@ Adason

Congratulations! You are the first Nr1 " Greedy Boyz Gold medal "
If confirmed by full finished kit assembling photos presentation 😀

Everybody chanting " We are the Champions "

Edit: extract about adjustement from Mr. Pass article

 

[adason]

its missing screws to assemble, but all else is there

 

[rhthatcher]

Solder tip about 650F,use SN63/37 eutectic solder...

My iron is typically set to 666 deg F, because my amps will play a lot of metal when done!

Parts kit is in transit, and should arrive tomorrow. What a week coming up - vfet & 2nd Covid shot!

 

[Soundhappy]

@ Adason

Thanks for the photos, well done wiring

Its work but 90% amplifier finished so no medal for the moment
the game is still open for 100% finished builds
maybe Codyt tomorrow or.. surprise new challengers 😀 Have Fun!