Question - HW-101

[Jack Crenshaw]

Yep, I agree. The motorboating is a sign of a power supply that has lost its stiffness.  I
have a couple of old Heathkits with the syndrome.

Jack

k4kgw wrote:

> Sounds as if you might have one or more electrolytic caps that are in need of changing.
>
> Keith
>
> Mike Hardie wrote:
>
> > My good old HW-101 has developed an interesting characteristic.  Shortly
> > after being switched "on" there's a weak motorboating sound on the speaker
> > (or headphones) that increases in frequency over about 10 seconds, then the
> > audio is normal. The rig operates as usual after that.  A faint flickering
> > of the voltage regulator tube is visible that corresponds to the
> > motorboating but substituting a new tube doesn't change anything.  Has
> > anyone else experienced this?
> >
> > Mike ve7mmh at: hardiem at intergate.ca
> >
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