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How to build Symmetrical Class A Preamplifier
August 7, 2010 - category: Audio preamplifierDescription
A very simple but very good amplifier unit, with low distortion. A similar modification was used as a preamplifier HAFLER. The quality however of the reproduced sound in all the symmetrical amplifiers regardless of the cost of the necessary materials, transistors, capacitor and resistors.
Circuit diagram
Part List
- R1= 100Kohm
- R2-3= 82Kohm
- R4-5= 22Kohm
- R6-7= 100ohm
- R8= 5.6Kohm
- R9= 100Kohm
- R10= 1Kohm
- C1-3= 10uF MKT
- C2= 56pF ceramic
- C4-5= 100nF 63V
- C6-7= 47uF 40V
- T1-2= BC 550C
- T3-4= BC 560C
- T5= BC 516
- T6= BC 517
circuit from http://users.otenet.gr/~athsam/symmetrical_class_a_1.htm
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