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[AMPS] Blow TL922

To: <amps@contesting.com>
Subject: [AMPS] Blow TL922
From: 2@vc.net (measures)
Date: Thu, 24 Feb 2000 10:47:05 -0700
>
>At 06:28 AM 2/24/2000 -0700, measures wrote:
>>Weird science?.  .  If you have output, the tubes can not be shorted, so 
>>there should be no Ip on standby.  
>>
>>>I turned the thing off.
>>>
>>Good news.  
>>
>>>Any Ideas what happend ?
>>>Anyone had a simular problem in the past ?
>>
>>
>>
>>>I am also seeking for a Service Manual to
>>>download or faxpoll.
>>>
>>Thanks to Skipp, I have s 922 service manual.  The ''troubleshooting 
>>section'' is one page.   . 
>
>Rich, wouldn't it be reasonable to surmise that he's lost the cut-off bias,

a possibility

>perhaps because of a contact failure in the much-maligned TL-922 T/R relay?

Although the cathode bias contacts in the relay can temporarily arc, I 
have never heard of one with welded contacts.  

> That would certainly explain the plate current on standby, and if the
>normally-open operating bias contacts are OK, also explain why the rig
>appears to be normal in "operate" mode.
>
Ip on standby is usually caused by a shorted tube.  If this situation 
exists in an factory-stock 922, the danger to the filament transformer is 
great.  
>
cheers, Pete

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