Fisher 800c static,crackle

skiman762 · 8th April 2009, 11:12 PM

I have a 800c and the left channel has a static/crackle sound in it not real loud but loud enough to hear in the music the right is dead quiet.
It plays fine but you can hear it only on the left even with the volume off. any ideas I reseated all the tubes no help there

m6tt · 9th April 2009, 01:00 AM

try swapping in a known good preamp tube, then replace any carbon comp plate resistors with metal film (anything but carbon comp, really). The carbon comps like to hiss after a few decades (or less) in a humid climate. They also crackle, sputter, and make other background noises. From your description, it's probably a plate resistor in the last voltage amp or the PI. Good luck!

skiman762 · 9th April 2009, 03:59 PM

Ok I wiggled the 12ax7s next to the output trans the left caused more poppng and seemed very loose I gently tightened the pin grip and it was much tighter but still had the static
I switched the left and right and the static moved to the right channel so bad tube I hope
Do I swap both the left nd right or can I just put a new one in the left channel and will it need any adjustments when I put the new tube or tubes in
thanks for the help
Ed

8th April 2009, 11:12 PM	#1
skiman762 diyAudio Member Join Date: Apr 2009	Fisher 800c static,crackle I have a 800c and the left channel has a static/crackle sound in it not real loud but loud enough to hear in the music the right is dead quiet. It plays fine but you can hear it only on the left even with the volume off. any ideas I reseated all the tubes no help there

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9th April 2009, 01:00 AM	#2
m6tt diyAudio Member Join Date: Aug 2007	try swapping in a known good preamp tube, then replace any carbon comp plate resistors with metal film (anything but carbon comp, really). The carbon comps like to hiss after a few decades (or less) in a humid climate. They also crackle, sputter, and make other background noises. From your description, it's probably a plate resistor in the last voltage amp or the PI. Good luck!

9th April 2009, 03:59 PM	#3
skiman762 diyAudio Member Join Date: Apr 2009	Ok I wiggled the 12ax7s next to the output trans the left caused more poppng and seemed very loose I gently tightened the pin grip and it was much tighter but still had the static I switched the left and right and the static moved to the right channel so bad tube I hope Do I swap both the left nd right or can I just put a new one in the left channel and will it need any adjustments when I put the new tube or tubes in thanks for the help Ed

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