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Old 5th November 2009, 06:48 AM   #511
neazoi is offline neazoi  Greece
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Thank you Dan,
Are you able to make any comparisons with a vacuum tube class-A amplifier?

Now that is a little messy cat (they are always like this, so we like them )
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Old 5th November 2009, 08:26 AM   #512
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Hi Neazoi I cant compare because i have different speakers since then.

-Dan
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Old 12th April 2010, 11:36 AM   #513
neazoi is offline neazoi  Greece
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It seems this topic is inactive for quite a long, I guess all of you are in building stages

I am on building stage too, everything ready, just a few connections left for the PSU capacitors, I will post pictures soon.

I have used battery only operation and non-magnetic BNC for the I/O ports in a configuration that I have post here K.Giannopoulos official site
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Old 12th April 2010, 04:07 PM   #514
bluevas is offline bluevas  Indonesia
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I am on building stage too
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Old 12th April 2010, 04:11 PM   #515
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Thanks for the link to the hilarious website.
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Old 12th April 2010, 10:39 PM   #516
neazoi is offline neazoi  Greece
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I just tested the amplifier. all the I/O cables are messy but I couldn't wait to give it a go. It works, it amplifies, this means no error on the circuit, but the 1 Ohm resistors get too hot. Mine are 3.5-4W and the schematic suggests 5W.

With the configuration shown on http://www.audio-constructions.com/m...-schematic.png the voltage drop across the resistors is 2.7V!! I have not made any adjustments yet, I just wanted to see that it works for now. maybe that is why the resistors get too hot?

Oh something else I plugged the batteries using cables and no switch and I got a nice spark from the huge initial draw current of the caps.... You wonder if this sparc would exist inside the future added switch? No, if you add a switch there is no spark I have tested it.

Not even adjusted and the sound is very transparent and it seems the bass region goes too low. The middle and highs are just excellent I have not heard anything like this before. I wonder how they will be when adjusted.
The volume is exceptionally high I guess it is much more sensitive than I thought, perfect for a passive preamplifier, as I had to adjust the volume of the internal attenuator of the CD to the minimum and still it was very loud for my room (I have 90-102dB speakers).

An exciting moment to see everything working as expected!

I cannot wait to make the adjustments (and replace the 1 ohm resistors with bigger wattage ones?)
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Old 13th April 2010, 08:08 AM   #517
neazoi is offline neazoi  Greece
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Not even adjusted and the sound is very transparent and it seems the bass region goes too low.
I mean the frequency, not the volume of the bass
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Old 13th April 2010, 03:16 PM   #518
bluevas is offline bluevas  Indonesia
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same as mine, too hot but my working voltage is 17v, need to drop to 12 v.
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Old 9th May 2010, 05:23 PM   #519
FRUGIVO is offline FRUGIVO  Spain
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hi all fron Burgos (spain)Neaozi tell us more about your final impresiones thanks!pedro
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Old 20th June 2010, 09:00 PM   #520
neazoi is offline neazoi  Greece
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hi all fron Burgos (spain)Neaozi tell us more about your final impresiones thanks!pedro
I am just building the sides of the box of the amplifier currently, where all the I/O will be attatched.

I added a 2K good quality multi-turn potentiometer parallel to each of the 1K resistor to set the bias for class-A and hopefully to reduce the heat on the load resistors.

I will let you know very soon of the results.
PS. I am running it only from batteries.
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