Paul K wrote:

For an amp, I think I'd like to use my father's old HK Award Series
A700, but it needs some restoration. When he stopped using it about
15 years ago, the switches and sliders were starting to corrode, but
the amp still functioned. Last time I tried to power it up though, it
just popped the fuse instantly.

Does this sound like something worth a restoration attempt? If so,
how do I start? How much might it cost?



Most likely the electrolytic filter caps are bad. Also other coupling
caps are likely to
need replacing. Take a look at the FAQs for the group
rec.antiques.radio+phono
http://www.cs.uu.nl/wais/html/na-dir...hono/faq/.html
And some sites on replacing capacitors:
http://www.geocities.com/wa2ise/radios/repair.htm
http://www.antiqueradio.org/recap.htm

Be careful of the high voltages used in tube electronics. Usually in the
hundreds of volts.