[motorBoater]

Hello All:
 
I am trying to get my hands on a Leach Audio Amp 4.5v. I want to either build or buy.  Does anyone have any printed circuit boards they'd be willing to sell or entire amps?
 
Thanks,
motorBoater

 

[duncan1]

Have you tried the delta audio website for parts. Its pretty ambitious  for a project . Big amp big wattage  big boards required . You are doing the right thing looking for boards because of the multiple output devices . This isn't an amp to be made on a breadboard as you would get HF oscillation right away. Its designed in 1976/8 by DR. Leach. featuring  an unusual cascode /differential input done differential input with  cascode as additional stage but not together. A lot of parts required although the output devices will be cheap as they are old type.The problem changing them for more up  to date ones is --unlike tubes where you can mostly get away with changing them with no major problems . "upgrading " output devices  especially  ones with more gain can effect the stability of the amp and it could oscillate blowing them.It wouldnt be so much of a problem with single output devices You would need to recalculate the value required  of the compensation capacitor.or just put in a large value and reduce it in stages watching on a scope.  Best of luck!

 

[lamode]

  Hello All:
 
I am trying to get my hands on a Leach Audio Amp 4.5v. I want to either build or buy.  Does anyone have any printed circuit boards they'd be willing to sell or entire amps?
 
Thanks,
motorBoater

 
Did you succeed?