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Old 2nd November 2009, 01:24 PM   #501
neazoi is offline neazoi  Greece
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That is a BIG heatsink I wonder if they ever get hot.
Congratulations on the finished amplifier...so... any lisening tests?
(I am really curious comparing it with tube class-A amplifiers)
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Old 2nd November 2009, 01:32 PM   #502
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Thanks Neazoi !

It is definately not hot after about a half hour running
I am listening now and i am happy so far - but i have to sleep will let you know more tommorrow

-Dan
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Old 2nd November 2009, 01:34 PM   #503
carolus is offline carolus  Belgium
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Default monster

Quote:
Originally Posted by danieljw View Post
and listening as we speak Dan
hi dan,
very nice piece of work/building,
plenty place inside (for music dancing),
good central centerpoint "0Volt",
plenty heatsink,
quid: what's on (function) the pcb (outgoing) to the driver terminal?
and last: what are your's musical impressions (on what kind of drivers)?
best regards,
karel
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Old 2nd November 2009, 09:58 PM   #504
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Hi Karel,

The Function of that circuit is speaker dc protection/de thump

So far i have only listened for a little while but it sounds very good
I am using Elsinore Mk. 3 speakers.

-Dan
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Old 2nd November 2009, 10:10 PM   #505
njepitt is offline njepitt  United Kingdom
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Dan,

A nice job indeed... Congratulations. Mine usually look like they were put together from stuff pulled out of the garbage, because... well....

Quote:
Originally Posted by danieljw View Post
Hi Karel,

The Function of that circuit is speaker dc protection/de thump

So far i have only listened for a little while but it sounds very good
I am using Elsinore Mk. 3 speakers.

-Dan
OT: What circuit are you using for speaker protection?

Cheers

Nigel
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Old 2nd November 2009, 10:25 PM   #506
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Hi Nigel,

Thanks

The circuit i am using is a old silicon chip (aus magazine) one
It is a filter circuit which passes ac but activates a relay with dc, some square wave signals also can trip it similar to clipping...

I am sure they were not the first to use it. and there is many variants of it around. The kit is now discontinued and they have replaced it with a similar version but with thermal protection and some other stuff, i have one at home but i opted for this one it seemed a shame to waste it.

PS: your stuff does not look like rubbish more like a good use of surplus electronics !

-Dan
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Old 2nd November 2009, 10:32 PM   #507
njepitt is offline njepitt  United Kingdom
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Quote:
Originally Posted by danieljw View Post

PS: your stuff does not look like rubbish more like a good use of surplus electronics !

-Dan
Thanks, but you should tell my wife that... ("You want to put WHAT in the living room???")

I'll see if I can find anything about silicon chip online - thx for the ref.

Cheers

Nigel
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Old 2nd November 2009, 10:57 PM   #508
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Hi Nigel,

I will send you a PM
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Old 3rd November 2009, 07:40 AM   #509
neazoi is offline neazoi  Greece
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Dan,
How would you compare it with your 20W monstre, or with your older monstre? Any audible differences?
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Old 4th November 2009, 11:46 PM   #510
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Hi all,

Neazoi, I think there is an audible difference to the Le class A 20W
the mostre seems a little bit more natural/better also requires a little bit more gain on the input..

it is able to go very loud with my Elsinore speakers so i am very happy at the moment it is what i listen to on a day to day basis

Actually i am very happy with the results - the heatsink runs at not much over room temp, and the amp is very quiet you have to have your ear right up near the tweeter to hear any noise with it connected but not signal - and this is mostly the cd player/preamp noise

I have not taken a very good pic of the amp from the outside but here is a pic anyway ... notice when i was at work one of the 2 cats has investigated the amp.... the top needs a wipe dusty for waiting to go onto the amp
and there is a small slit you can see through which i have to re-align...
Click the image to open in full size.

-Dan

-Dan
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