Charles1dad- Pls send me an email msklein52@comcast.net, if you are interested in comparing the Takasukis and BTs to KR and/or AVVT We clones. I have a pair of each but my VAC takes 4 300bs, so they are "on the shelf" right now. With the need for 4 tubes, cost is an issue, so I'd love to hear how these compare. I understand that its likely to be system dependent, but what isn't. Anyways it would be a starting point.