>Subject: RE: [AMPS] Ameritron Al-811H
>Sent: 5/7/97 2:55 AM
>Received: 5/9/97 7:09 AM
>From: w8jitom@postoffice.worldnet.att.net
>To: amps@contesting.com
>
>
>> >Thanks for the input. Are you saying there is a big problem with the
>> >811H or did they fix this problem?
>> >
>> >Mike
>> >W0MU
>> I have no idea what the failure rate is, Mike. The apparently
>> parasitic-related failure I saw may have been the only one---or it could
>> have been one among many.
>> You might try asking Mr. Rauch which type of VHF suppressor is currently
>> being used.
>> Rich---
>
>Hi Mike,
>
>Parasitics do not cause filaments to break in a tube. Those claims
>are silly.
Why?
>Filament breakage is due to mechanical shock or weak mechanical
>points in the filament.
The 811As in question were manufactured in China. The allegedly weak
filaments survived shipping to the U.S. The 811As were being operated in
the amplifier, sitting on a table, producing normal RF output when there
was a noise. The filament glow extinguished. No gas was subsequently
detected in the envelopes of the blown tubes. If failure was due to a
mechanically weak filament, does it seem likely that more than one tube
would fail at a time?
...snip...
>73 Tom
Rich---
Sue Measures
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