[Johnson] Viking Thunderbolt

[Steve H]

Ok Bob thanks I guess it will be a slightly complicated tune operation
but I guess that the way it is.

Also wondering if anyone knows did the Tbolt come designed for AB2 
operation?

I'm told yes, then others have said no it was Ab1. This one I am told was 
modified
for AB1 operation from AB2. I suppose it was modified then re-modified to go 
back to original,
but I do see a large square cap soldered over the blocking and bias jack for 
the screen, which does not look
to be original.

--
Steve Hearns
KA2PTE

----- Original Message ----- 
From: "Robert Nickels" <ranickels at gmail.com>
To: <johnson at mailman.qth.net>
Sent: Thursday, February 04, 2021 1:25 PM
Subject: Re: [Johnson] Viking Thunderbolt


> On 2/4/2021 11:43 AM, Steve H wrote:
>> . I think if I leave that in line, I will be tuning the radio, then the 
>> amp, then the tuner, which is
>> redundant. Is there a better way?
>
> No, you've got it right. You always want to make sure the antenna presents 
> a low SWR, either naturally or by means of your antenna tuner, before 
> applying high power, because very high voltages can develop and arc over 
> and create some real headaches.
>
> Since you're using an external power supply, you want to make sure that 
> the chassis of the amplifier and the power supply are firmly bonded 
> together before applying AC power. That wire should be the first one you 
> attach and the last one you remove.
>
> Be careful when powering-up the power supply with just the bleeder load to 
> be sure you don't exceed the maximum ratings of the filter components.
>
> 73, Bob W9RAN
>
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