Hi Dibya,
In the sixties and seventies quasi amps were popular because there were very few high power pnp transistors.
So using ideas from the 'n' type vacuum tube of the day, quasis were designed and built.
They are a very design from the POV of second harmonic; they sound warm, but deliver high THD which cruelled them in the eighties when npn/pnp complements became available at moderate cost. They are something of an 'effects box', but they can sound good and quite a few high end amps have used quasi topologies for quite a time.
In DIYaudio with RanchuQ, we designed an documented a quasi which became quite popular and sounded very warm and relaxed. There are actually five different pcb layouts on that thread (the Very Simply Quasi Amplifier, VSQA) and if you read the thread right through (130+ pages!) you will quickly educate yourself with the ideas.
HD
In the sixties and seventies quasi amps were popular because there were very few high power pnp transistors.
So using ideas from the 'n' type vacuum tube of the day, quasis were designed and built.
They are a very design from the POV of second harmonic; they sound warm, but deliver high THD which cruelled them in the eighties when npn/pnp complements became available at moderate cost. They are something of an 'effects box', but they can sound good and quite a few high end amps have used quasi topologies for quite a time.
In DIYaudio with RanchuQ, we designed an documented a quasi which became quite popular and sounded very warm and relaxed. There are actually five different pcb layouts on that thread (the Very Simply Quasi Amplifier, VSQA) and if you read the thread right through (130+ pages!) you will quickly educate yourself with the ideas.
HD
ok. i wait for next improvements design circuit
it's seems too long way but interest