Cary Audio Design CAD 211 AE owner manual Troubleshooting Guide

CAUTION

Never remove or insert the AC plug when the unit is on or the AC power switch is in the “ON” position. Obstruction of the top portion of the amplifier will result in the tubes overheating.

TROUBLESHOOTING GUIDE ________________________________________

SYMPTOM	CAUSE	REMEDY
Hum or “Buzzing” in	Ground loop	Install 2-pin adapter
speakers		on AC cord to float the ground
	300B tube with high plate
	current too high	Check bias of 300B. If high,
		readjust to proper bias setting
		of 60 mA
	Intermittent or poor connection	Replace bad interconnect cable
	of interconnect
“Popping” or “Spitting”	Noisy tube	If noise is in one channel
noise		through the speaker, swap one
		section of tubes at a time until
		the noise swaps channels.
		Replace the noisy tube.
	Check bias of output tubes	If high or fluctuating rapidly,
		replace output tube
AC fuse blows	Line voltage surge	Replace fuse
Tube fuse blows	Shorted tube (300B &	Replace tube
	845 have separate fuses.)

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