Question about Amplifiers & Preamps
When i turn it on the meters light up --there is no click in the amp as there was before.There doesnt seem to be a burnt odor in it.have checked both fuses and test ok. i really cood use all the help i can get. have had this guy for over 20 yrs and want it back working again, If i cant repair it i can find another,but wood like to give it a try
First off, SAFETY FIRST!!!!!!
Never, never, never open a unit unitl it has been unplugged from the wall for a couple of hours. Especially if it is a tube unit. The filter cap (capacitors) maintain a charge if the unit is plugged in, and they do not discharge when unplugged for a long time. Literally, if you were to accidentally touch one while still charged it would throw you accross the room.
Tubes can eaily be removed, but finding a place to check them is another story altogether. If you look through your Yellow Pages (Redd, Green, Blue, whatever) look for an older repair place. Newer shops don't what analog is so they definatley won't have a tube checker. One quick, inprecise way is to turn the unit back on with the cover off-mind you don't touch anything-and the tubes will lite up with a dark amber glow. Any that does not will be bad.
Since your not smelling anything burnt (older units will normally burn a component), if I was checking things out I would look at components in the amplifier circuits. You said the unit turns on a the meters are lit so the pre-amp section seems OK. This could tested if you have another amplifier. Take the pre-amp outputs from the KA-405 into another unit to verify signal does in fact exist.
Either way, it will not be something serviceable by you (unless a tube, but at 20 years old, I don't think it has tubes, besides the unit looks too small). I know some people here that work on older units if you do want it repaired. But check locally first.
Hope this helps a little
Posted on Jan 24, 2008
You said that there is and odor in it? check for a burnt resistor and your output transistor (if its a transistor type) or tubes. ( but I dont know how to check tubes, hope you know how)
open your unit and turn it on, you have to identify what is causing the smell. and check around that part for some other malfunctioning part. like resistor, capasitor, diode, anything else.
and if you know the voltage of that part, you should check the voltage, wether it needs more or to much.
Posted on Jan 24, 2008
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