[Heathkit] Heathkit diodes 57-27 and ALC.

[Tom Chesek]

Heath's master parts list says 1N2071.

Tom K3TVC


----- Original Message -----
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: <Heathkit at mailman.qth.net>
Sent: Saturday, March 03, 2007 2:40 PM
Subject: [Heathkit] Heathkit diodes 57-27 and ALC.


> Does anyone know what type of diode the Heathkit part number 57-27
> is, and what its ratings are? PIV, current, etc?
>
> I know it is a silicon diode, but that is as much as I can find out about
it.
>
> Three of these are used in the HW/SB transceivers in the ALC circuit. I
> think at least one of mine is damaged as I have no ALC action at all in
> any SSB mode.
>
> When I adjust the MIC/CW LEVEL control on CW with the key down,
> and with the meter in the ALC position, I can swing the meter from
> somewhat below 0 to full-scale, depending on where I set the control,
> but nothing whatever shows up on the meter when in voice mode,
> except an occasional blip upwards from zero.
>
> Thanks,
>
> Ken Gordon W7EKB
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