[Amps] Alpha 78 Problem

[k8mlm at aol.com]

Isao,

The normal warm up time for the Alpha 78 is 3 minutes.  However, dur to the age of the caps and/or carbom comp resistors in the timer circuit the timer may not work or take a long tome to turn on.

I have an old Alpha 77 and have to overhaul (replace caps anr resistors) on the turn-on timer and active bias control boards to keep it operating properly.

Bob
K8MLM


-----Original Message-----
From: isaonuma <isaonuma at cablenet.ne.jp>
To: amps at contesting.com
Sent: Tue, Dec 29, 2009 6:08 am
Subject: [Amps] Alpha 78 Problem


Hello all,
 I have recently bought Alpha 78 and it's faily clean. I checked inside and
eemed OK. So I connected 220V line and swithed on it. High voltage shows
500V+ at CW, 2000V+ at SSB mode. Air flow is OK and getting warmer little
y little. But, not as mentioned in the manual there is no illumination of 
ale
ed or amber. I waited for 45-90 seconds, but there is any change of light 
or
ny click sound of relays. Maybe there's some failure on 28VDC line. 'Cause
 didn't hear any sound from K2-Step start relay.
ny comments, suggestions are appreciated.
73, Isao JH1ROJ/KG8XV near Tokyo, Japan 
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