"Karl Uppiano" wrote in message news:y3iid.990$Uy5.359@trnddc07...
"unc80" wrote in message
om...
Needed: Help Diagnosing Weak R Channel on HK Citation 14 Tuner

I have a Harman Kardon Citation Fourteen Tuner... the R channel only
puts out a very weak audio.. can hear music, but only high freq and
very faint.. If anyone can give me some ideas on how and where to try
and diagnose what's causing weak R channel, would greatly appreciate..
L channel is fine and strong.

Also, pulled out the 2 blown lamps behind meters.. part # CM 1813 but
no values... anyone know values of replacement bayonet type bulbs?

Thanks for any help.. Greg in Chapel Hill, NC

I'm not familiar with this unit specifically, but if it's like most
direct-coupled power amps (basically a discrete op-amp) look for a dried out
non-polarized capacitor in the ground side of the feedback circuit. It would
cause the problem you describe.

Otherwise, look for other dried out electrolytic capacitors (the ones in
little metal cans -- sometimes with heat-shrink tubing on them).

Do you have fuses on the board (especially underneath where you might
not have seen them)? I suspect a blown one may be present and what you
are hearing is crosstalk. A good place also to go is the forums at
www.audiokarma.org where there are a number of forums for both SS and
tubed vintage audio sets staffed by some topnotch service pros and
dealers as moderators. EchoWars' sticky on DC offset is a must read if
you have an old SS receiver/beast with certain balance problems. Best
of luck!

Steven