SYMEF amplifier

[Nico Ras]

I am still interested to know where this is going. By the way that is not my pooch its my wife.

BTW. I am just lurking around these days, not much interesting things going round.

 

[OnAudio]

Positive feedback is a plus for the formula. You know how it goes...

Lucky you....she is cute

You never know what one will find ...

 

[OnAudio]

future 4 Output transistor layout

The future

 

[OnAudio]

multiple output transistor version

Where the output transistors are quite a number

 

[evette]

Thank You Mr. Harrison for giving me the pcb,s for this amp. @ friends of mine helped me built this 1 channel of a great sounding amp. My power supply is giving me 45+ 45-at 500va. I,m using 66,000 mfd caps. I changed the Front end to a i cap input of 2.7uf this is all I had at the moment. The output is biased at 65ma,,offset is only 2,5mv- The sound is WOW Great amp. Thanks again Mr. Harrison. Evette

 

[evette]

Further listening with the amp I,m more and more impressed with the ease in which it can take you into another world. I can,t wait to build the other channel and use better parts,to bring out this best this amp can do. Thanks again Mr.Harrison Evette

 

[OnAudio]

Thank you.

Hi Evette,

Thank you for your contribution to the state of the art. I am glad that you are expriencing what the formula tries to capture .

kind regards,

Harrison.

 

[OnAudio]

Any...
Worries,
Concerns,
Suggestions
Comments ?

kind regards,

Harrison.

 

[OnAudio]

This is too quiet, we are supposed to be breaking records here with, probably the worlds best amplifier

 

[brianco]

Waiting for transformer and heatsinking!

 

[OnAudio]

Thank you Brian any pics ?

 

[pinnocchio]

How much heatsink per channel can we expect?

Ciao!
Do

 

[OnAudio]

At full power assuming a temp rise of 38 degrees celcius from ambient a 1 degrees celcius temp rise per 1 watt of heat will do a temp of about 63 degrees. Thats really hot

 

[OnAudio]

thats assumming ambient is 25 degrees

 

[OnAudio]

Whats the rating on your heat sink ?

 

[brianco]

0.5...low enough?

 

[OnAudio]

That sounds ok by me

 

[pinnocchio]

I was thinking one of those two

4"-6" of this one
10.080" - HeatsinkUSA, LLC Store

or

4"-6" of this one
10.000" - HeatsinkUSA, LLC Store

Do

 

[OnAudio]

To get the thermal resistance call them or read this
Estimating Parallel Plate-Fin Heat Sink Thermal Resistance Electronics Cooling Magazine – Focused on Thermal Management, TIMs, Fans, Heat Sinks, CFD Software, LEDs/Lighting

 

[pinnocchio]

I have a few samples here. I might just go brute force for now...

I'll adjust later on when ready to put in a chassis

Thanks
Do