Design of the darTZeel NHB-108 Model One power amplifier

[james]

http://www.stereophile.com/solidpoweramps/405dartzeel

".....
The darTZeel NHB-108 Model One amplifier (NHB stands for "Never Heard Before") is based, Delétraz says, on the triple principles of simplicity, purity, and reliability. That means the 108 employs open-loop input and output stages with no global negative feedback. Nor does it use relay switches or fuses in the signal path. It employs a scant six transistors per polarity side from input to output, and only a single pair of bipolar output transistors per channel. The NHB-108's output is biased to produce about 20W in class-A, and it runs rather warm—as in Careful around that heatsink, buddy!
..."

Here is a description of its design [in 6 parts] by the designer Delétraz :


http://www.stereophile.com/news/10825/
http://www.stereophile.com/news/10832/
http://www.stereophile.com/news/10839/
http://www.stereophile.com/news/10844/
http://www.stereophile.com/news/10851/
http://www.stereophile.com/news/10857/

I found the details of the design and build quite interesting.

james

[james]

The two manuals about the amplifier are even more interesting ..

http://www.dartzeel.com/PDF_Files/AudioManuEN.pdf

http://www.dartzeel.com/PDF_Files/UserManuEN.pdf

they are PDF files ...

James

[Diapason]

I'd really love to hear some of the darTZeel line, there's a certain aura about those products.

[nige2000]

some of the ca guys will recognise some of the principles
built with the power supply as priority
huge amounts of capacitance
separate rails
rfi/emi divisions

[sima66]

some of the ca guys will recognise some of the principles
built with the power supply as priority
huge amounts of capacitance
separate rails
rfi/emi divisions

Attention to details........Perfection!

[Fran]

I think I read somewhere that this amp uses LDRs in the signal path rather than switches which accounts for some of the clarity I think.

Serious wampum needed to buy one though.....