I've previously had this same problem with such amplifiers. Culprit was
always the capacitor associated with the timing circuit going leaky and
preventing a full charge to switch the timer circuit.
Replace with a similarly rated electrolytic and the problem will most
likely be resolved.
You can prove it first with a voltmeter across the capacitor to observe
the charge, or rather lack of.
73
Martin, HS0ZED
On 13/12/2014 08:15, J.H Mauduit-Larive wrote:
Hello,
I have an Alpha 76CA #SN 6704 (October 1983). The amp has been stocked
for about 10 years! When I press the ON button , the panel meters
illuminate amber but do not change to pale green after 60/90s as
indicated. Blower starts, HV is normal : 1.5 KV but the meters do not
change to green indicating "ready to transmit". This looks like a
"time delay" problem. Do you have any suggestion to fix this trouble.
Living on Reunion island (Indian ocean) it's very complicated to ship
back the radio for repairing... Thanks in advance for your help.
Herik, FR5DX.
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