>Subject: [AMPS] Alpha 374
>Sent: 3/30/1997 8:20 AM
>Received: 3/30/1997 8:29 AM
>From: Chuck Sudds, csudds@probe.net
>To: amps@contesting.com
>
>It appears that there is quite a wealth of knowledge on this reflector
>concerning Alpha amps! So here are my questions:
>
>1) I have an old Model 374. I am able to get legal output + on 80-10
>except 15M where it only puts out about 200W!! My 15M antenna has 1:1 SWR so
>I know that this is not the problem.
>
A one band only problem is usually due to a burned bandswitch contact,
Chuck. A photograph of a burned bandswitch that was removed from an
Alpha 3-holer can be viewed on my website at:
http://www.vcnet.com/measures
see Figure 15.
If your bandswitch is burned, you can determine what the most probable
cause was. Unsolder one end of each VHF suppressor R (Rs). Measure the
resistance. If the highest suppressor resistance is at least 50% higher
than what it should be, odds are that VHF energy damaged the resistor.
In other words, it might be a good idea to decrease the VHF voltage
amplification of the 8874s.
R. L. Measures,ag6k,805-386-3734
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