Opinions on Potential Amp Build

[M6NTL]

Hi,
I would appreciate the opinions of the 'amp specialists' in this here forum, as to what this looks like (on the surface anyway, obviously without a schematic it's hard to be sure) - looks like it operates in Class A for all the power I'll ever use.
Many thanks in advance...

https://www.ebay.com/itm/122441080945

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[Firebottle]

It's a class AB certainly but how much is class A is wholly dependent on the standing current.

That isn't given so very difficult to know.

[M6NTL]

It's a class AB certainly but how much is class A is wholly dependent on the standing current.

That isn't given so very difficult to know.Thank you for your reply.
The listing states max 100W in Class A, so I guess that depends on bias.
Cheers...

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[M6NTL]

Hmmmmmmmm,
After a bit more thinking, I think I might just build a Pass F5...

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[grog]

F5 would be better for sure, but they give off a lot of heat, also depending on how nice you want it to look, the case/heatsinks can be expensive,
i'm also looking to build an F5, but might also build a ESP P101 for something cooler running. https://sound-au.com/project101.htm

[M6NTL]

F5 would be better for sure, but they give off a lot of heat, also depending on how nice you want it to look, the case/heatsinks can be expensive,
i'm also looking to build an F5, but might also build a ESP P101 for something cooler running. https://sound-au.com/project101.htmInteresting read, thank you!

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[Blackdog]

I wouldn't trust that to run more than 10 watts class A. There is not enough heat sinking, and the fins run the wrong way to dissipate the heat.

[M6NTL]

I wouldn't trust that to run more than 10 watts class A. There is not enough heat sinking, and the fins run the wrong way to dissipate the heat.Thanks for the advice.

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[JRead]

Hello M6NTL,

I agree with Blackdog, when I saw 100 Watts Class A a little work out resulted in 344 Watts continuously to be dissipated by those heat sinks, at +/- 45 Volts about 3.8 Amps.
The 10 Watts would be fine though, few speakers actually need more, most of the time we listen to about 0.25 Watts.

Cheers - J

[M6NTL]

Hello M6NTL,

I agree with Blackdog, when I saw 100 Watts Class A a little work out resulted in 344 Watts continuously to be dissipated by those heat sinks, at +/- 45 Volts about 3.8 Amps.
The 10 Watts would be fine though, few speakers actually need more, most of the time we listen to about 0.25 Watts.

Cheers - J[emoji16]

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[iansr]

Colin Wonfor is just about to release the latest PCBs for his SECA amp which will do up to 40wpc of pure Class A with suitable heatsinks. I guarantee it will pee all over the one the OP referenced. I’m going to be making a mono block version.

Link to 40wpc SECA amp (http://www.audiochews.com/discussion/1609/sovereign-s-new-40w-seca-class-a#latest) added by Filterlab

[Bksabath]

F5 would be better for sure, but they give off a lot of heat, also depending on how nice you want it to look, the case/heatsinks can be expensive,
i'm also looking to build an F5, but might also build a ESP P101 for something cooler running. https://sound-au.com/project101.htm

If you need help … I am on the 4th build

[Bksabath]

Hello M6NTL,

I agree with Blackdog, when I saw 100 Watts Class A a little work out resulted in 344 Watts continuously to be dissipated by those heat sinks, at +/- 45 Volts about 3.8 Amps.
The 10 Watts would be fine though, few speakers actually need more, most of the time we listen to about 0.25 Watts.

Cheers - J
I agree on the we listen to about 0.25 W
On Hifidog amps we are running 240 W dissipation per channel

F5 can be scaled up from the original Papa (Nelson Pass) design

so far 24v traffos to get 32 V rails

I am tempted to go higher but 60 V caps are expensive but then I do not think I need more head room as most of the time we listen to .25 W any way

[Bksabath]

Colin Wonfor is just about to release the latest PCBs for his SECA amp which will do up to 40wpc of pure Class A with suitable heatsinks. I guarantee it will pee all over the one the OP referenced. I’m going to be making a mono block version.

Link to 40wpc SECA amp (http://www.audiochews.com/discussion/1609/sovereign-s-new-40w-seca-class-a#latest) added by Filterlab

Is there a schematic for it love to have a look at it

350VA trafos for a 40W tell me more please

[Colin Wonfor]

Is there a schematic for it love to have a look at it

350VA trafos for a 40W tell me more please

There is but you will need to download it and sign into the forum.

https://seca.freeforums.net/thread/274/new-seca-kit-easy-build

[Bksabath]

Thanks Colin got it