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Old 18th April 2010, 09:33 PM   #531
zabadac is offline zabadac  United Kingdom
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Default Ncc200

I believe the circuit is updated - see this webpage:
Audiophile Power Amplifier modules from Avondale Audio : avondale audio

Circuit attached.
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Old 18th April 2010, 10:32 PM   #532
Ruwe is offline Ruwe  Europe
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Keep us posted. It's interesting to know the result of your changes. The Douglas Self's book has a lot of information about this same basic schematic, and lots of developments and improvements. Still, I read sometimes mixed reviews about his "Blameless" amp. I'm very curious though!
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Old 19th April 2010, 12:39 AM   #533
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Zabadac you posted the same circuit I did before !
These need DC protection !
When I turn it of after 1 minute I can measure 6-7DCV on the speakers terminal.
Otherwise sound great and works great . Of course I tested 4 different power transistors a lot of other parts . It is really sensitive to almost all parts it use .
I played over two weeks testing , testing and more testing new parts .

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Old 19th April 2010, 12:31 PM   #534
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My test with Aussie modules

Cheap hi-end system
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Old 19th April 2010, 12:39 PM   #535
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Location: On a mushroom
If it is a switch off issue - soft start circuit (depending on the relays you chose - 2x DPDT can double to disconnect the speakers at the point of switch off and on at the point

so Soft start relay is timed at say 800mS
and speaker relay 100mS behind that

though at switch off the speaker relay will drop first

no complex DC measurement or balanced rail comparator

though even this may not be inexpensive in parts or time.

A crowbar circuit is relatively cheap- but I personally have never liked them
the good old triac across the speaker outs to create a short circuit I've always thought of as madder than my avatar.
Hum likes to have a nice "Noise to Signal" ratio
To "Hum" is to be noticed Quality hum is when it pours out of Electrostatic speakers
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Old 20th April 2010, 12:17 AM   #536
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Originally Posted by audiodesign View Post
My test with Aussie modules

Cheap hi-end system
Very nice! I have those too and I am very happy with them.
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Old 9th July 2010, 05:17 PM   #537
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I thought I might help see this thread continue so I have just ordered the naimclones. Will report back once I know what ones they are (hoping they are the avondale copies). I recently completed two of the Goldmund clones. Superb amps. It will be interesting to compare with the naim.
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Old 12th July 2010, 08:38 PM   #538
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Well I built the clones. They are the original Avondale types. All went well and they work. Just one problem. I'm supposed to set 6-10mv accross the 0.22ohm resistor but all I get is 0.5mv and adjusting the pot doesn't alter it. (meter set on 200mv dc) If anyone out there can help me I would be most obliged. Please explain like you are talking to a monkey.
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Old 13th July 2010, 06:09 AM   #539
2Bak is offline 2Bak  Denmark
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Keep turning the pot, Barry.
Finally you'll get there.

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Old 13th July 2010, 07:31 AM   #540
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Cheers Jan, I never realised these pots turn so far. I was afraid I was giving it a big dose of dc and not able to measure it. It sounds great now. Thanks very much for your quick and helpful reply. My next question is a general one realy. I don't know if a pre-amp is neccessary. I never used one on my gainclones or goldmund clone, and although the naimclone sounds good would a pre-amp improve it. (I see their is even a naimclone pre-amp on ebay) Does impedance matching do anything these days. Comments very welcome. Regards Barry
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