once you have a dummy load you prabably want to measure both DC and AC
voltage - ac for noise and DC because its bad news. A large DC offset
positive or negative is going to supply current to the voice coils of
the speaker and the speaker cone will not move because only an ac
current generates a moving magnetic field and a moving magnetic field
moves the cone. A large DC offset can fry the voice coils in the speaker
without you hearing anything... :-(
On 02/06/2010 21:13, Charles Geilfuss wrote:
> Given the vast experience of this group, I'm hoping one of you can answer
> a question for me. Sunday evening I was bike riding in my neighborhood.
> Since Monday is trash day people start putting things to the road for pick
> up. I noticed a pile of stereo gear at the curb and went to investigate.
> Picked up a Technics CD player and tape deck that work fine. There was also
> a Technics SE-A50 Amplifier in mint condition. It weighs as much as a Yugo
> but I managed to get it home. Alas, someone else had already taken the
> Preamp. This brings me to the question: when I power up the unit there is a
> brief pause then a click (seems normal so far). There are two small lights
> on the front; one for each channel. The left channel light glows but the
> right does not. If only the bulb is burned out then all is well and good.
> How could I simply test the unit to see if the right channel is working? Is
> it safe to put a multimeter across the speaker terminals on the back?
>
> Thanks,
> Charlie
>
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