[Kenwood] TS-820s - Final tubes overheat/toast when heater ison.

[Richard Knoppow]

----- Original Message ----- 
From: "Bill Kuhn" <BKuhn at kuhngroup.com>
To: <kenwood at mailman.qth.net>
Sent: Saturday, July 23, 2011 7:28 PM
Subject: Re: [Kenwood] TS-820s - Final tubes overheat/toast 
when heater ison.


> Sorry it's been so long since I originally posted.
>
> The culprit was the bias - or complete lack thereof.
>
> It took me a while to track it down, but it turned out to 
> be a loose
> connector (RF3) on the RF board that carried the bias 
> voltage. Plugged
> it on securely and bias is on the tubes and they are 
> behaving properly
> (new tubes!).
>
> Tomorrow I'll set the correct bias voltage, neutralize the 
> tubes, and go
> back to the original problem - no S meter reading,
>
> Thanks to all who responded!
>
> 73 DE NO0OO
>
> Bill Kuhn

     Since a flakey connection caused the loss of bias it 
might be worth checking other connectors, reseating board 
connectors, etc., to see if that cures the meter.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com