Schematic is here (warning, ~2mb file..)

http://www.hafler.com/techsupport/pd...20_amp_man.pdf

The instruction is given for the bias, but not for the balance.
How do I adjust the balance? Is this a good amp?

Thanks
Andy

(Andy) wrote in news:aed59298.0308041137.122690e5
@posting.google.com:

Schematic is here (warning, ~2mb file..)

http://www.hafler.com/techsupport/pd...20_amp_man.pdf

The instruction is given for the bias, but not for the balance.
How do I adjust the balance? Is this a good amp?

Thanks
Andy


According to the manual balance is adjusted for minimum distortion. You
need a low distortion sine wave generator, distortion analyzer and
presumably an 8 ohm load resistor. You also need to know what signal
level and frequency to use. I'm guessing 1 kHZ and 10% of full output
would do the trick.

Have you changed transistors or have some other reason to beleive the amp
needs adjusting?

Tim

In article ,
(Andy) wrote:

Schematic is here (warning, ~2mb file..)

http://www.hafler.com/techsupport/pd...20_amp_man.pdf

The instruction is given for the bias, but not for the balance.
How do I adjust the balance? Is this a good amp?

Thanks
Andy

It appears that the balance control adjusts the uncompensated slew rate
balance between positive and negative swings. A high frequency square
wave of moderate amplitude might help you. Adjust it so that that an
oscilloscope shows a symmetrical output waveform.

Or it might not work. Mark where the pot is before you turn it

In article ,
(Andy) wrote:

Schematic is here (warning, ~2mb file..)

http://www.hafler.com/techsupport/pd...20_amp_man.pdf

The instruction is given for the bias, but not for the balance.
How do I adjust the balance? Is this a good amp?

Thanks
Andy

It appears that the balance control adjusts the open loop slew rate
balance between positive and negative swings. A high frequency square
wave of moderate amplitude might help you. Adjust it so that that an
oscilloscope shows a symmetrical output waveform.

Or it might not work. Mark where the pot is before you turn it