Amcron DC300a overhaul.

 Bravo Sir!

great result. Always a relief when you fix that elusive fault and hopefully a satisfying sense of acheivement

Thank you gents. I will not be beaten by a 47 year old amplifier! Of course,it doesn't help that the official schematic is wrong....the voltages they give,and some of the components dont match at all,including at least half a dozen resistors,transistors and capacitors that simple dont exist on my board. I guess they modified these on a yearly basis,and no-one bothered to update the schematics.


I even emailed Crown direct,and asked if they had the correct schematic for my amp, the reply, "Thank you for your enquiry, we do not release schematics,these are only available to our official service centres" suggesting i take the amp there!

As if anyone is going to do that with something this old.

They even had the cheek to send me one of those customer satisfaction surveys afterwards.....so that will be Zero, zero,zero,zero,zero and zero then.



In the slim chance of anyone from Crown ever reading this,dont be so bloody stupid,it's not as if anyone is going to steal the design of this thing after all this time.

Possibly the result of a long production run. Components become obsolete or expensive, better parts become available, feedback from the customer, new design staff, all conspires to change the design over the years. It's the same with the macrotechs. There are many circuit revisions and one bears little resemblance to another.