[Boatanchors] [National] NC-303 RF Amp Grid Resistor Fried ???

Carl km1h at jeremy.mv.com
Sun Mar 1 20:44:14 EST 2009


A serious dose of RF, lightning and/or a shorted tube.

Carl
KM1H


----- Original Message ----- 
From: <w0ng at comcast.net>
To: <boatanchors at mailman.qth.net>; <national at mailman.qth.net>
Sent: Sunday, March 01, 2009 8:04 PM
Subject: [National] NC-303 RF Amp Grid Resistor Fried ???


> In the process of restoring a NC-303 receiver, I noticed that the 33 
> ohm resistor at the control grid of the RF amp tube (6BZ6) had fried 
> in half. All other resistors in the circuit are OK. It's no problem to 
> replace the resistor but I could use some advice as to why it happened 
> in the first place and is there more to it than I know. Any help 
> appreciated. 73, Bill, w0ng
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