[Johnson] VIKING VALIANT QUESTION

[k2sse]

Hi
I've recently acquired 2 ea Viking Valiants from different estates.
After testing tubes,caps etc I've noticed something strange.
Under the chassis  of one there is a 6 pin terminal strip which has all the T3 Modulation transformer leads wired to it and I count 4 red and 2 black leads to it.
The other Tx has a 5 pin terminal strip. 4 red leads and 2 black leads to it but there is another black lead from the Transformer which goes straight to the plate of one of the 6146 modulators!!

Both transformers  are labeled P2998 but  the older tx has one more lead.
The resistance readings of one are also different from the other.

Is this an earlier version or was a factory mod made or what?
Does anyone know please??

73
Al