[Johnson] Viking I durability?

[Carl]

Yep, that was part of the redesign to get accepted by the ARRL, sound like 
Ma Bell and get the SSB crowd satisfied...including the players at the ARRL.

Carl
KM1H


----- Original Message ----- 
From: <tbs50a at aol.com>
To: <johnson at mailman.qth.net>
Sent: Saturday, May 25, 2013 8:36 PM
Subject: Re: [Johnson] Viking I durability?


>
> The driver trans limits the frequency response something awful too. One of 
> the first things to go when cleaning up the audio.
> Terry N3GTE
>
>
>
>
>
> -----Original Message-----
> From: Carl <km1h at jeremy.mv.com>
> To: johnson <johnson at mailman.qth.net>; tbs50a <tbs50a at aol.com>
> Sent: Sat, May 25, 2013 5:46 pm
> Subject: Re: [Johnson] Viking I durability?
>
>
> The driver iron limits the modulation % well below 100% without serious
> distortion while the mod transformer is stressed much beyond 100% at 100W 
> as
> it was designed for the lower power V-1. Raising the HV, changing to 
> higher
> output tubes, etc is asking for trouble in either TX.
>
> The Heath DX-100 mod xfmr can be substituted, there appear to be plenty
> available.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: <tbs50a at aol.com>
> To: <johnson at mailman.qth.net>
> Sent: Saturday, May 25, 2013 4:46 PM
> Subject: Re: [Johnson] Viking I durability?
>
>
>>
>> From what I've seen the driver transformer is the problem not the mod
>> trans. The large voltage divider resistor is usually open. The LV power
>> trans sometimes fail.Be careful with the V1 w/829B. It has no clamp tube
>> (along with the early V2's) tuning it up with no or low grid drive will
>> kill the 829B in a flash.These are a few things right on the top i can
>> think of.
>> Terry N3GTE
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Brian Burns <brian at lessonsinlutherie.com>
>> To: johnson <johnson at mailman.qth.net>
>> Sent: Sat, May 25, 2013 2:08 pm
>> Subject: [Johnson] Viking I durability?
>>
>>
>> Hello Carl,
>>
>>
>>
>> " OTOH the V-1 didn't age well and survivability percentage is likely
>> lower.
>> It was already a throwaway by the time the late 50's SS gear revolution
>> hit."
>>
>>
>>
>> I've heard that the modulation transformers weren't quite up to the job,
>> but
>> otherwise they seem to have a really good reputation for reliability. 
>> What
>> other issues are there, that might be fixed in a restoration job?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Brian
>>
>>
>>
>>
>>
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