[Johnson] Johnson Viking Ranger (No Audio)

[Rodger]

Brian,

What is your resting modulator current?  The adjustable tap wirewound
resistor which supplies modulator screen voltage is a common mechanical
failure (often due to over tightening of the tap and/or constant
readjustment to hit exactly the right value).  If you have normal modulator
idle current, watch it while you carefully turn the audio gain up (with a
quiet background).  There is generally enough hum pickup that the modulator
current will increase slightly even with a bad microphone.  Otherwise, check
tubes in the audio chain since just glowing is only useful for light bulbs
and tube operation relies upon other conditions being met.

73, Rodger WQ9E

> -----Original Message-----
> From: johnson-bounces at mailman.qth.net [mailto:johnson-
> bounces at mailman.qth.net] On Behalf Of Brian Sarkisian, KG8CO
> Sent: Sunday, February 11, 2007 2:46 PM
> To: johnson at mailman.qth.net
> Subject: [Johnson] Johnson Viking Ranger (No Audio)
> 
> I just picked up a Johnson Viking Ranger I.  The Viking puts out good
> power and the meter readings look within spec, however, I am getting no
> audio output.
> 
> What should I start off checking?
> 
> The tubes are all a glowing.
> 
> 
> Thank You
> 
> 
> Brian, KG8CO
> 
> 
> 
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