AudioSector-chip amp kits, dacs, chassis

[karma]

she made it

thanks peter.

heres my idea if it works or not thats gota be seen

[karma]

close up. it has a fan in the back that should keep it cool i hope.



cheers

[wdavis009]

So, in an attempt to try out a different set-up that might work a little better with my speakers I installed Brian's big PS board with the Carlos Filipe snubber. Being the impatient person that I am I hooked up the new PS board without testing it first and created two nice little fires as the chips in each channel lit up and melted before my eyes. In addition to the chips, both of the $7 tantalum feedback resistors are toast. I'll have to clean off all the black soot to see what else is gone, but the boards seem okay. Guess I now have the perfect opportunity to try the Caddock and Riken resistors Peter recommends. An interesting aroma is still lingering in the living room...

Wade

[Peter Daniel]

The buffer circuit has been tested today, and I'm greatly impressed. Together with a passive Placette, it is way better than my modified Levinson 380S. The sound acquired completely new dimension, resolution is improved, but what most important, the melody lines are much better pronounced now. Each instrument and each sound exists in it's own space and has now complete freedom of expression. Small details, that were not noticed previously, are more obvious now.

Interestingly, I placed the buffer between DAC and the Placette (10k input imp). I didn't try it the other way, but what I hear, seems to be rather hard to improve

[Peter Daniel]

However, this change is not only due to the buffer itself. Last weekend, I made major modification to my speakers.

Few weeks ago I've replaced the MTM Triangle/Raven combo with FAL/Raven. Following some suggestions, I was initially using FAL full range, but for some reason, I couldn't get into that sound completely, as some strange coloration and ringing was always present. Finally, I measured FAL and they had some terrible picks and dips, but this characteristic indicated perfect candidate for low pass application below 2.7kHz. So last weekend I installed a coil (0.82mH) in series with the FAL and I changed the ribbons to Aurum Cantus GS1 (they are more durable at lower frequencies). While previously Ravens were used above 12k, this time AC were down to 3k (with a single 6.8uF cap crossing). I placed the ribbons somewhat to the center, because it was only available support space around ( I also attenuated them a bit with 10R series Holco 1/2W resistor). This combination appears to be very good, and so far, those are the best speakers I've heard in my house, truly a curtain has been lifted.

[vgeorge]

Hi Peter,

if you want to built a complete pre, it is better then to put the buffer at the input, before a 10K attenuator?
I already have your DAc and I am very happy with it, but I want to have other sources as well if I decide to built a pre with your buffer.

George

[mikelm]

Originally posted by Peter Daniel
...but what I hear, seems to be rather hard to improve

Yep - that's until you do the next significant mod....

[Elso Kwak]

Originally posted by Peter Daniel



Not really a substitude but recommended upgrade, and that's what Madrigal was installing in (upgraded) ML380S. ADEL2020 has supposedly better specs than previously installed version.

DigiKey carries them at $3/pc (min 50pc qty required).

What would be still interesting is to get MAT02/MAT03 in place of 2210 and 2220.

hi MAT02 is better than SSM2210 though specs are the same.
I have tested both. MAT02 has higher Beta or HFe

Of course Per-Anders does not believe me...... How many 2210 do you have for sale Per?

[mikelm]

Originally posted by Elso Kwak



hi MAT02 is better than SSM2210 though specs are the same.
I have tested both. MAT02 has higher Beta or HFe

Hi elso

My ssm's have Hfe of about 600 ( npn ), what are the MAT's typically ?

ps thanks for this info I have not seen MAT's - I'll check them out

mike

[karma]

peter what type of speaker is this one? see pic

thanks