[Heathkit] Heathkit diodes 57-27 and ALC.

[ma.locksmith at juno.com]

According to the SB-101 manual, it's an "ordinary" power diode....  500
PIV, 750 mA.

Typical 1N4006 replacement

Ed
K1ZOK


On Sat, 03 Mar 2007 11:40:24 -0800 "Kenneth G. Gordon"
<kgordon2006 at verizon.net> writes:
> 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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