Sony vFET Amplifier Part 2

[6L6]

Mistakes? How about this... don't test amplifiers at high power with square waves... I blew up a few output stages doing that before I realized it wasn't the smartest idea... 😀

 

[J2M]

Always encouraging to hear the details of mistakes...

Subtly put Nelson!
Perhaps when I am feeling a little bit braver and when time has passed somewhat I may reveal the secrets of resistor folly!

Best regards, John.

 

[Gyuri]

Just you don't forget till then, what was the case. 🙂

 

[Gyuri]

That words, "holographic imaging" was what I haven't find when I tried to describe this amp's sound.
Thanks!

 

[J2M]

Just you don't forget till then, what was the case. 🙂

Hi Gyuri,
No, that was a hard lesson to learn, but learned it was.

John

 

[Gyuri]

Hard lessons learned well!

 

[marc brown]

Hard lessons learned well!

Wins the award for most posts in one topic. [emoji106]


Sent from my iPhone using Tapatalk

 

[Gyuri]

For example, I will never get married once more! 😀

 

[Zen Mod]

Mistakes? How about this... don't test amplifiers at high power with square waves... I blew up a few output stages doing that before I realized it wasn't the smartest idea... 😀

you can , but with no load

 

[Nelson Pass]

After you've worked out all the other kinks. High power square waves into
capacitor is the last test. After all, you know the customer will be doing it
if you don't.

 

[Studley]

We'll offer batch 3 around February 6th, as usual email notifications will be sent out, in order of when you signed up on the list, however based on previous sales I am quite sure there will be enough for everybody and the remainder will list in the store to the public. It won't be ready to ship for a few months.

Jason
My batch 2 order arrived safely thank you. I'm on the batch 3 list for another set of boards/kit. I'd like to now place my order for 2 enclosures and 2 pairs of brackets.
From what you say I should be safe doing that now - yes?

 

[mk57]

Need help SMOKE!

Just finished part one of one channel,resistor test all spot on, installed caps and rest of part 2 (no fets) start to power up slowly - side led lights all's seems good + side led does not light and Q13 gets super hot! Checked all the obvious but see anything and yes Q13 is in correctly.

 

[Gyuri]

Hi mk57!
Q7 would be IRFP240.
Regards,
Gyuri

 

[mk57]

Opps.......... Thanks

 

[Dennis Hui]

Good catch Gyuri!

 

[Gyuri]

A blind man may perchance hit the mark...

 

[Nelson Pass]

My life would be much more difficult without you guys.

 

[Gyuri]

And it would be very boring, isn't it?

 

[mk57]

Ok I swapped Q7 and Q8 to correct sides but that did not fix the problem.

 

[delecoy]

Hi mk57,

Is that goop on Keratherm under the mosfets? Or is the camera just fooling my eyes?

I'll be posting my own pictures for everyone else's examination next week 🙂

Cody

Just finished part one of one channel,resistor test all spot on, installed caps and rest of part 2 (no fets) start to power up slowly - side led lights all's seems good + side led does not light and Q13 gets super hot! Checked all the obvious but see anything and yes Q13 is in correctly.