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Old 24th November 2012, 11:46 AM   #11
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Join Date: Feb 2007
Location: Tashkent
Here are some shots of the SIT amp. Since it sounds really good, I have put some efforts to decorate it, with a custom machined volume control knob (bulk titanium) and titanium screws visible at the front panel. The volume control potentiometer is Penny&Giles RF15 10kOhms.
One could mention, that I tend to some rare components. It is partially true, I simply get some pleasure from using things, that are not easy obtainable from a department store.
Attached Images
File Type: jpg Front-Top view.jpg (96.1 KB, 268 views)
File Type: jpg Back panel.jpg (117.1 KB, 265 views)
File Type: jpg Inside.jpg (131.7 KB, 263 views)

Last edited by VladimirK; 24th November 2012 at 11:49 AM.
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Old 24th November 2012, 11:53 AM   #12
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Join Date: Feb 2007
Location: Tashkent
The new SIT amp has been also granted with a custom made equipment carrier, made from 40mm plywood.
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File Type: jpg System.jpg (142.1 KB, 248 views)
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Old 24th November 2012, 11:57 AM   #13
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Join Date: Feb 2007
Location: Tashkent
Other amps that I compare to this SIT amp are the following:

1) Similar SE topology, but with HF bjt transistors instead of SIT
2) No GNFB SE amp, with Ge bjts at the output

Moreover, a tube SE 300B amp is playing at the comparisons, it was specially acquired for this purpose. Some description of this tube amp is here
http://www.nemrussia.com/home/production/a300se
http://www.ultraudio.de/nem_a_300_se.html
It is visible at the bottom of the equipment carrier, standing on the floor.
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File Type: jpg jFET_BJT MIDI.JPG (177.8 KB, 246 views)
File Type: jpg БезОООСник с ди.JPG (111.0 KB, 191 views)

Last edited by VladimirK; 24th November 2012 at 12:09 PM.
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Old 24th November 2012, 12:08 PM   #14
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Join Date: Feb 2007
Location: Tashkent
What can I say about sound differences
All are perfect at mids and highs. They overtake even the tube amp. Most differences are at the bass region, maybe because my PMC EB1i speakers are not an easy load. Value of output impedance says almost nothing about bass impression. In my case, it depends more on a kind ot transistors used at the output. Namely, I still find, that the No GNFB amp with Ge bjts at the output gives the most "detailed" and naturally sounding bass, athough other amps also produce "big" and powerful sound.
Most time I am listening to the SIT amp and to the No GNFB Ge amp.

Last edited by VladimirK; 24th November 2012 at 12:10 PM.
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