4 replies to this topic

[neuf]

My ole DC300A hums, not through the speakers...it just has a humming sound emanating from the amp.  I was looking for a pdf manual to see if there were any suggestions, but could not find an old user manual.  If anyone has any suggestions or a link to a manual, I would be most appreciative.

Thanks!

[bobbysdad]

It's the transformer that's humming but I just can't remember the fix.
(The ol' brain's just not it used to be.....)
Someone else is bound to step in with a solution.

In the meantime, you can find the manual for this (and other legacy amps) here: http://www.crownaudio.com/legacamp.htm

All the best...

[neuf]

Thank you for your response!  I got the manual.  You state "the ol' brain is not what it used to be..."  I noticed I posted this question a couple years ago.

[karlos the dc300a]

hello,

Some dc300a amps had quite bad transformer hum, if the belly band around the tx is copper it shouldnt hum too bad, if its later aluminium band it will hum a lot more.

Best to make sure the transformer pimary has been set to correct mains voltage for your country.

You should have + / - 60v dc voltage rails inside the amplifier if the transformer primary has been configured correctly.

Often the primaries were set wrong resulting in an overloaded transformer and a bit more buzz than there should be.

good luck

[Crowndog]

toothpicks, the thin flat one's. Works every time.