Post your Solid State pics here

[AudioSan]

chassis wise you can aim for 50W class A. as long as your room don't get too hot for you.
at 50W class A the sinks should stay around 55C even at ambient temp 25C.
measure the temp at the baseplate right next to one of the outputs.

 

[jacco vermeulen]

I did a test with bias to 65W in Class A yesterday and my heatsinks are close to 50 Celcius

If I may ask, at which ambient temperature ?

(the power amplifier you are building is far from suitable for AB operation. you would not enjoy it, imo)

 

[pinnocchio]

If I may ask, at which ambient temperature ?

(the power amplifier you are building is far from suitable for AB operation. you would not enjoy it, imo)

Ambiant temperature of my room is 19-20 Celcius. It's in the basement so it stays cool all year long.

Thanks
Do

 

[zeepup]

The top of the amplifier was installed and it was running for about an hour which is sufficient to know. The temperature stopped climbing after ~40 minutes. Anyways, the 100 watts is a dream but in reality I will most probably put it at around 40 watts in Class A, it gets too hot in the room. In reality and practically, 25 watts in Class A should be sufficient and the rest in AB.

I have to test my comfort level in the room after setting the bias to be at 40 watts in Class A and if too hot in the room bring it down. It will also save on electricity! 😀

Ciao!
Do

I am using that setup as we speak, 4 aleph mini's 20 watts each class a, and a 200watt high speed class a/b..

 

[andrewlebon]

AB CLASS AMP

Mono ab class amp

 

[chriscam]

Revision/One

3 channel mainboard for use in Philips MFB enclosures, fits as a 1:1 replacement to the original electronics.

An externally hosted image should be here but it was not working when we last tested it.

 

[damon1983]

круть

Now I using AD8066 (i/v) and AD825 (LPF) instead LM6172+LT1468. I've think, that AD8065 will be a little better than AD825, but not sure.
(new filter for OpAMPs).😀😀😀😱

 

[vezilka]

P3A

P3A by Rod Elliot + Hi-Fi Preamplifier by Rod Elliott (P97).
Soft start, speaker protection, automatic cooling fan control.
- 2x21V/ 300VA Torroid, 8400µF per rail for main PSU
- 12V/ 1.5A SMPS for the fan control & speaker protection circuit

 

[redjr]

Very, very nice clean build vezilka

 

[2011diy]

MY NEW AMP！！

 

[redjr]

MY NEW AMP！！

Well done. Very nice looking boards there.

 

[Federmann]

MONO
6xE88CC
10xIRFP240
10xIRFP9240

 

[smartx21]

P3A by Rod Elliot + Hi-Fi Preamplifier by Rod Elliott (P97).
Soft start, speaker protection, automatic cooling fan control.
- 2x21V/ 300VA Torroid, 8400µF per rail for main PSU
- 12V/ 1.5A SMPS for the fan control & speaker protection circuit

Very very nice! Congratulations.
BTW, 4700 x 2 = 9400....
Please place some videos!

 

[zeepup]

Well done. Very nice looking boards there.

that's a ebay china clone amp.

 

[redjr]

that's a ebay china clone amp.

Well, good luck with your build anyway. I have several, different china amps. They always seem to work out as expected.

 

[jacco vermeulen]

that's a ebay china clone amp.

Vertical MOSFET output stage, with lateral MOSFET drivers (TO-3P ones).
If I may ask, a clone of which/what ?

 

[AudioSan]

first of. it was not zeepup that posted the orignal post with this amp 🙂
Jacco: is there a China e-bay amp that is not a clone of anything? 😀

 

[zeepup]

first of. it was not zeepup that posted the orignal post with this amp 🙂
Jacco: is there a China e-bay amp that is not a clone of anything? 😀

Not that I'm aware of! They clone anything to make a buck..

 

[vezilka]

Very very nice! Congratulations.
BTW, 4700 x 2 = 9400....
Please place some videos!

sorry yes its 9400 🙂
I'm on a vacation now, but I can post some videos soon.

 

[Jay]

Vertical MOSFET output stage,

Looks like BIPOLAR to me. I don't recognize those transistors but the PCB specifies 2SA/2SC. BIGBT?