LinLai WE 300B or the LinLai Global Elite Permaloy 300B tubes ?

@sns,
Yes I'm definitely getting the message that the Amtrans volume control is a worthwhile acquisition.  What specific selector knob should be ordered? Does it come directly from Amtrans ? I have a local tech who could make the swap.

  Is this a pretty straightforward job or are there issues to be aware of? Now I'm curious about the volume control transformers and what options are viable. upgrades.  I really don't want to ship the 2 chassis unit to Canada 😊. I'd be happy with this these 2 modifications.
Charles 

@sns,
Okay I see (Your earlier post above) that Amtrans is available through the Parts ConneXion . What specific part number/model? Thanks my friend.
Charles

BTW. .  .back to the discussion about 300b tubes. . . Recognizing that there is some rebranding, I count 23 manufacturers of 300b tubes, each with as many as 4 different varieties. 

@charles1dad 

I have had success dealing with Amtrans directly: audio@amtrans.co.jp

Gary

Thanks Gary. It's been some years ago but I think I purchased my Takatsuki tubes through them.  Yes,  guilty of straying off topic but @sns was  providing some highly appreciated information and perspective. 
Charles