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Old 18th August 2010, 05:16 PM   #1
rongon is offline rongon  United States
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Default New to this -- recommend a good ~50Wpc board?

I'm looking for a way to make an inexpensive stereo amp out of kit boards. 50 watts per channel should suffice. The intended use is as a gift to someone who plays classical music and opera CDs and FM radio into a pair of floorstanding speakers of moderate efficiency.

I'm a tube hobbyist person, so am not adept enough at solid state to build from scratch. Figured I'd get my feet wet with a kit. I'd buy the enclosures separately, along with the jacks, binding posts, etc.

I was thinking I'd put an input selector switch and volume control in there and call it an 'integrated' amp. There's no need for a tape monitor loop.

What is the typical input sensitivity of these amp kits? Would the output from an FM tuner be capable of driving one to near full power? (I figure about 250 to 500mV from the tuner, but I don't know for sure.)

How do these Class D amps sound? Are they comparable to store-bought receivers in the $500 USD range? Or (hopefully) a noticeable step up from that?

So, what are the best kits available these days? Chinese stuff from Ebay? If so, are there really good ones to get? Others in particular to avoid? Or does Parts Express have a good kit that will fill the bill?

I'm basically looking for a pleasant (non-aggravating) sounding amp for cheap.

Thanks.
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Old 18th August 2010, 05:40 PM   #2
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Maybe an AMP5 or AMP6 from 41hz would suffice, alittle tricky to assamble tho.

Perhaps a preassambled one from ebay like that 2x100w from connexelectronics or something.

Do some looking around and see if you find something you like.
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Old 18th August 2010, 05:44 PM   #3
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Try this.

Based on Hugh Dean's AKSA 55

Ask in the thread, I believe Greg has PCB's he can offer. The AKSA is legendary as well as super simple, I think it is what you are looking for.

Or if you want to go whole hog you can purchase the original from aksaonline.com.

- keantoken
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Old 18th August 2010, 06:37 PM   #4
rongon is offline rongon  United States
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Have done some looking around -- Is the Sure Electronics TA2050 board decent?
2*100w TK2050 TP2050 Tripath Class-T AMP Board Upgraded - eBay (item 250681462338 end time Aug-18-10 21:15:06 PDT)

I was looking at AMP4 from 41hz. Tried to log on to 41hz site, but it won't come up. Network problems maybe. I'll try later.

It looks like the AKSA boards are out of my price range. But I'll ask Greg about PCBs.

How sensitive are these things to loading from input switching and volume pots?

--
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Old 18th August 2010, 08:20 PM   #5
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Class D amps are designed for efficiency, not sonics. An analog solution would probably be more fitting. Many people in fact try to avoid chips... But that is the purist approach.

I usually see a 50k input pot being used in amps. Usually there is a high-value resistor right at the input, to precharge the input cap which prevents loud pops when switching. Apart from this I've never heard complaints about volume controls. However for purists there are "constant impedance" stepped volume controls...

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Old 18th August 2010, 08:58 PM   #6
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Quote:
Originally Posted by keantoken View Post
Class D amps are designed for efficiency, not sonics.
Ouch.... that was unnecessary.
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Old 18th August 2010, 09:24 PM   #7
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Okay, I'll rewrite that a bit. Yes they are designed to sound good, they must to sell. But from what I hear, they still don't compete with the analog alternatives. So if you don't need the efficiency, why would you even consider one? This was my line of logic.

Opinions are scary, yes they are,
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Old 18th August 2010, 09:33 PM   #8
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Hello

I agree with keantoken, a very well designed analog amp will have more musicality, a better sound stage and a more engaging sound compared to a class D. For sure you need to use an excellent cd player and well recorded music cd to ear the differences.

Class D are still a young design compared to analog amp, so we will see how they will develop in the future.

Bye

Gaetan

Last edited by gaetan8888; 18th August 2010 at 09:43 PM.
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Old 18th August 2010, 09:41 PM   #9
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Originally Posted by gaetan8888 View Post
p, so we will see how they will develop in the future.

Bye

Gaetan
good morning Sir ! My greetings to the midle-ages ....
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Old 18th August 2010, 09:48 PM   #10
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Originally Posted by TheDealer View Post
good morning Sir ! My greetings to the midle-ages ....
Hello

Do some serious blind tests listenings of some the best high-end analogs amps compared to the best class D amps, you will ear the differences, class D sound much less musical compared to the best high-end analogs amps.

No need to tell more, since the thread are not about that.

Bye

Gaetan

Last edited by gaetan8888; 18th August 2010 at 10:06 PM.
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