🚀 go-pugleaf

sehari@iastate.edu (Babak Sehari) writes:

>In <kkv1+xl@rpi.edu> nasiom@vccnw10.its.rpi.edu (Milton Peter Nasiopoulos) writes:

>Q. How to check specker impedance.
>A. Use a signal generator, to generate a 1KHz signal put the speaker and
>   a one ohm resistance in series, and connect the speaker-resistance
>   combinations to the signal generator. Measure, the voltage across the
>   speacker and the one ohm resistor. Now you can calculate the speaker's
>   resistance at 1KHz.  Also check the DC resistance of the speaker with
>   ohm-metar.  Your future speackers should have the same impedances.
>Q. What could have gone wrong?
>A. The output transformer that connects the speakers to Amp. might have
>   shorted itself.  If so, it should be changed.  Look at the resistors
>   see if you can find burning sign on those.  See if the Amp burns the
>   fuse without speakers?  Also, tube Amp are not supposed to run with
>   Sq. waves or very high frequencies.

>Good luck, let me know if you had more problems.

>                With highest regards,
>                     Babak   Sehari.

If the amp is old, it may also be worth changing all the electrolytic 
capacitors as a matter of course, since old electrolytics often go leaky.

Christopher Hicks (cmh@uk.ac.cam.eng)