Hallicrafters HA1 Keyer

[Brian Carling]

Have you checked/replaced the capacitors?

On 11 Apr 2004 at 21:18, Rinkie & Ron Pollack wrote:

> I've had this nice keyer for at least 30 years, and I'm kind of
> embarrassed that I can't figger out this problem, even tho I'm not a
> technical type.
>
> Cannot get the sidetone to work.  Here's what I've done:
>
> Checked that the jumper is in place on the accessory socket.
>
> Replaced the tube (V4)
>
> Replaced the NE2 bulb
>
> Replaced C8 and C9
>
> Checked tube voltages
>
> Checked speaker
>
> Checked resistances of resistors and pot.
>
> Checked the relay.  (Am using the relay contacts meant for the
> sidetone to key a Heathkit code practice osc for temporary sidetone!)
>
> Still no sidetone!   It appears that the oscillator runs continuously
> and the output of the transformer is keyed by the relay.  I assume
> that the transformer is ok, since if the primary were open then there
> would be no voltage on the plate, and I checked continuity on the
> secondary.
>
> Should the NE2 bulb be lit all the time ( It is not).  Is there any
> way to check the bulb itself?
>
> With fewer than a dozen parts in this circuit, it should be a cinch!
> What am I missing?
>
> Also, occasionally the keyer will give just dots in either the dot or
> dash position, but it goes away quickly.
>
> I have used the keyer on and off for many years, but with a  SB401/303
> combo that has a built in sidetone, so I turned the volume down on the
> keyer, but I seem to remember it not working years ago, but I never
> bothered to check it out because I wasn't using it.
>
> Any ideas on either of these problems?
>
> Thanks!
>
> Ron K2RP
>
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