DIY Sony VFET pt 1

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Amp #27

Chassis arrived! Beautiful!!!

Here’s teaser porn of amp #27
 

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Test fit. I couldn’t resist. Bananas for scale / size reference. I can definitely see building this with the chassis apart then doing final assembly with all boards in place. It’s a tight fit for my clumsy hands. The all silver look is really nice - this is a sexy chassis! Well done!
 

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I usually avoid LED's unless they are used for a V ref.
But, in this case (sorry, pun not intended) I can't help but feel that the V FET logo should be milled all the way through the face plate and illuminated red from the back via a diffuser; that would look really cool :cool:
The standard panel LED would not be required unless used as a speaker protection indicator.
 
Biggest advantage of external SMPS “brick” is that it has been safety certified and approved by almost every possible organization. CE, UL, CSA, FCC, etc...

The amp itself is inherently safe from electrical-mains shock hazard. It allows a product development cycle to save a lot of $ in CE/UL certification fees.
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I have a SMPS 24V for the ACA, not meanwell, and there is . . . static on the line (60 or even 110V), so there is some capacitor from the line to the chassis.
Like with bad mains transformers with static capacitance to the house.

Ughhh. I will have to open it to get a decoupling cap out. Now I cannot safely connect it to the system. Badly, in the shed I see no problem, just when I have the cable in my hand and the other on a chassis in the room :cuss:
Once connected it is silent.
 
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I have a SMPS 24V for the ACA, not meanwell, and there is . . . static on the line (60 or even 110V), so there is some capacitor from the line to the chassis.
Like with bad mains transformers with static capacitance to the house.

Ughhh. I will have to open it to get a decoupling cap out. Now I cannot safely connect it to the system. Badly, in the shed I see no problem, just when I have the cable in my hand and the other on a chassis in the room :cuss:
Once connected it is silent.

A 22nF film cap from analog ground to protective earth or chassis ground in parallel with a 10ohm resisor or large NTC is not a bad idea as part of a ground loop breaker.

I am not sure what you mean that the psu has the mains line connected to the chassis with a cap? More than noisy, sounds semi-lethal...
 
Much easier to drill indeed! And I'll be converting mine to IEC socket with internal SMPS module, I think. Maybe even twin SMPS for a dual-mono power setup.

A front panel switch is a must-have for me... will have to come up with something that doesn't disrupt the beautiful front panel design. I'm thinking one of those round illuminated-ring Bulgin power buttons, placed right where the small original LED hole is. I've got one left over from another project.
 

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