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Since I kind of targeted with my YoYo tube to the RE604-class then I am considering to pay once a lot of money and to buy one of those RE604 to see how much YO186 better or worse. (BTW, do not be under impression that YO186 is cheap – it is not still it is not $1500 per NOS RE604). Standing the park of small oxide power tubes from 30 it look like there is a great variety of the tubes that that I might be using in the amp above if I go for YO186.

Besides the mentioned Telefunken RE604 and Klangfilm/Siemens KL71403 it also might be Philips RE-614, Valvo LK460,  Triotron k435/10, Mazda 601 or DW302, Mullard AC084, Ferranti P4, Tungsram P460 or O15/400 ( the last has slightly higher plate impedance) and Marconi PX4.

The similarly of YO186 with PX4 opens a whole new chapter in exploration of YO186. I think I did heard an amp once with some kind of yellow driver but I did not paid attention to it’s sound.  During that times all of those DIY amps I considered as people soldered instead of sniffing bangs. I was too far from truth as the owner of the amps was “dead”, still it would listed that amp now just for sake if my curiosity in PX4.

Interesting that Prague-based company KR Electronics that Adrian pitched above makes today production of PX4

http://www.kraudio.cz/pic/px4.jpg

That kind if make my idea of going for RE604-YO186-class tubes kind of expendable and not so dead-end bookish if the YO186 heat the wall sonically. I was trying to found out how much KRs’ PX4 cost but it looks like no dealers have them. Are any visitors on my site from Czechoslovakia who can quote the KRs’ PX4 price? As anyone around Boston who run PX4 and would be interested in temp PX4/YO186 swapping for few days?

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