300b Schematic

Posted by admin on Sunday, June 27, 2010 · Leave a Comment 


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Technical question for electronics wiz?

I have a Maco 300 Amplifier below is a schematic. I want to unhook the internal fan because it is worn out and rattles. I just want to make sure I wont increase voltages somewhere else by doing this that might cause harm or undesired output. Thanks for your replies.

http://www.cbtricks.com/Amp/maco/maco_300b/graphics/maco_300b_sch.jpg

also, how do i empty the power from this amp so i can work on it, i once bumped the top of the tubes and got a nasty shock.
yes of course I am replacing the fan, I already have 2 12v brushless computer case fans installed
its cool, im not asking how to hook up 12 volt fans, i got that covered, Jebus can’t anyone just answer a question anymore?

For the 12V fans you can use the 12V from the heaters but you will need a bridge rectifier, a 1000micro cap and a 12V regulator(LM 7812)!!!
In the schematic,after the bridge rectifier there are 3 caps(120micro).For protection just add a 220k/2w resistor in parallel with each one.After you switch it off wait 15 minutes before you start operate inside!!And use a multimeter to see if the caps are empty,if not wait until they are!
good luck!!

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