[Johnson] JV II Signs of life (death?)

[Rich Soennichsen]

Glen,
     Well this is good news, I was fearing a transformer.  As an
experiment I swapped the VR4 tubes and tried again.  This time I saw a
shower of sparks in one of the 6146 tubes.

Thank you for the 6146 tube information, you may have saved me from
buying the 6146B's.  I remember seeing "matched sets" of 6146's for
sale somewhere.

I will replace both.  Thank you again for the help.

This sure has been exciting!  I am nervous enough about all the high
voltage in this rig, add that to a breakfast of too much coffee and I
am at ad jittery.  :-)

73

Rich

On 5/28/06, Glen Zook <gzook at yahoo.com> wrote:
> Sounds like the 6146 was shorted.
>
> Replace both of the 6146 tubes with either 6146 or
> 6146A/8298 and the 5R4 with any of the 5R4 types.  You
> can also use 6293 tubes.
>
> Avoid the 6146B/8298A and any 6146W with a code date
> of 1964 and later.
>
> If you haven't read the article on the 6146 family of
> tubes that was in Electric Radio a while back (and has
> been republished in several other publications) go to
> either of the websites that are listed at the end of
> this message.
>
> The vast majority of transmitters that were designed
> for the earlier versions of the 6146 are not "happy"
> with the 6146B which is a completely different tube.
> A minority of transmitters will work fine with the
> 6146B/8298A and 6146W after 1963.  I have had 3
> transmitters with serial numbers within 10 of each
> other.  The 6146B worked in 1 and not in the other 2.
> It depends on a lot of things, primarily how the
> component tolerances "add up" as to whether or not the
> 6146B will work.  Read the article and then you will
> know where you are going.
>
> If you mean the Johnson Valiant II instead of the
> Johnson Viking II, there are 3 6146 tubes in the final
> amplifier and 2 in the modulator.  The 6146B will work
> fine in the modulator so long as both tubes are 6146B.
>
> NEVER mix a 6146B type with the earlier types in the
> same circuit.  You can mix the 6146 with the
> 6146A/8298 since the difference is in the heater
> circuit.  But NEVER mix a 6146B with either of the
> earlier versions.  This is really asking for trouble.
>
> Glen, K9STH
>
>
> --- Rich Soennichsen <rsoennichsen at gmail.com> wrote:
>
>
> I threw the switch and this time watched the tube
> side, no smoke this time but after a few seconds the
> same terrible noise and the VR9 (5R4) and one of the
> 6146 (V7) tubes were putting on a light show of purple
> light.  Of course I only let this go on for a second
> or two.
>
>
>
>
>
>
>
>
>
> Glen, K9STH
>
> Web sites
>
> http://home.comcast.net/~k9sth
> http://home.comcast.net/~zcomco
>
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