Breeze amplifier.

[Svjatoslav]

Breeze amplifier (current output, without feedback).

I'm sorry dear audience for the bad English.
As a replacement of the classic triode tube PP amps.
With this task, he successfully managed.
The first model was established 2.5 years ago.

 

[amptech]

It look's there's some balancing adjustment vr's in the i/p stage..the amp does not seem to have a zobel circuit on the o/p end a 10 ohm 5 watt plus a 100nf would do here..

 

[DUG]

source follower J-FETdriving
common base BJT driving
emitter follower BJT driving
common source MOS-FET

current source output

with no closed loop feedback (except for DC)

Interesting circuitry

Any distortion tests done?

 

[Svjatoslav]

Zobel at the amplifier output is not needed.
It measured the output impedance (without ballast resistor 200 ohms) 600 ohms.
Output current proportional to the input voltage.
All stages except the output operates in class A.

 

[Svjatoslav]

IMD is very close to the harmonic distortion. Fundamental harmonics - 2 and 3, the highest decrease rapidly. Slowly increased with increasing power and range is always falling.
Cf measurement at 5W into 8 ohms in investing.
Design has turned out due to the fact that it was possible to find and pick up really jfet complementary pairs of transistors for low-power amplifier input.

 

[padamiecki]

As a replacement of the classic triode tube PP amps.

wow, how about the output offset, dcgnfb controlls it?

 

[Svjatoslav]

While tube PP that compare, much inferior Breeze by the sound.
This is in my opinion in a preview of all due to its very high output impedance. The second - with high linearity preliminary stages covered by local feedback in Class A at low variable voltage.

 

[Svjatoslav]

Can be chosen a pair of complementary transistors
BF245A-2SJ103GR.

 

[Svjatoslav]

Crossover speaker to work from the current amplifier, which include Breeze and Breeze 2.
Consecutive crossover, a division of 600 and 6000 Hz. Configure and test operation completed.

 

[Bonsai]

Some nice gear there!

 

[Svjatoslav]

Thanks!
The third photo amplifier Breeze on the right side.
To the left of his tube push pull amp.

 

[Svjatoslav]

The divider for headphones to the amplifier Breeze.
Recommended isodynamic, orthodinamic.