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

Two caps in PS, two in signal chassis. As for improved timbre, I'd suggest some or most of that improvement comes from both volume transformers and Amtrans volume selector, although having used Muse caps in prior mods in other equipment I can assure they are a very natural sounding electrolytic cap. Both VS and VT in signal path, have bearing on timbre or coloration of the entire pre. I'd also suggest the Amtrans is superior here to cheap Chinese upgrade (stock Chinese volume selector even cheaper than upgrade) unit here, much better metallurgy and no dialectic. Amtrans precise volume tracking is likely responsible for much of the improved sound staging and imaging I'm hearing, doubt the Chinese unit can replicate this. I did mention this particular aspect of improved performance to Israel, he concurred, much of this improvement due to Amtrans.

@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