------------ ORIGINAL MESSAGE ------------(may be snipped)
On Fri, 9 Feb 2018 17:06:25 +0700, you wrote:
>Amps from Acom and OM, maybe some others, have a large amount of
>capacitance in series with the output after the power/SWR bridge. In the
>case of the Acom 1000 this is 6 parallel 10nF/500v disc ceramic
>capacitors with a 1 megohm (static bleed?) across them.
>
>Have not seen this configuration on older Alpha amps or others. Can
>anyone comment on the purpose?
>
>Thanks
>
>Martin, HS0ZED
REPLY:
Just a guess: It might be a safety issue. In case the plate blocking
capacitor shorts, it would prevent HV from appearing on the antenna.
Other amps do this protection with a RF choke across the output of the
Pi network. In case of a blocking cap short, the fuse(s) would blow.
73, Bill W6WRT
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