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Romy the Cat wrote:

When I said four transformers I meant that I can see 4 type of the tubes. The 2A3 with 700-80R on plate, YO186 with 1200R on plate, the 45 with 1800R on plate and 10Y with 5K on plate. Hey are requires different transformers.  I do not like taps. I like to have transformer with remapable sections. The 2A3, 45 and YO186 still might be possible to care with one transformer; the 10Y would need a very different beast. Also, I have a filing this time to try something different. I might go with DHT for a slower core OPT but to load anodes more idle – I have a feeling that it might bring me where I would like to be. I am thinking about 4.5K-5K for 2A3 – I mean a lot of impedance, as much as my S2 will be able to handle. I even will to give up a bit speed of my code for trying it…. In my single-stage IDHT amp I have no gain to afore this luxury.

Studying YO186 I concluded that that it was not AD1-type tube as it was mistakably considered but it rather was an equivalent for RE604, LK460 , E406 , KL71403, K435/10, P460, P4, O15/400, RE614, U4H

They all 4V with near 1A on filament. They all from one to two kohm on plates (with exception of U4H that has 4K), basically 1.3-1.4K in average. The YO186 with it 1.2K would feet the bit but the plate impedance would greatly vary with operational current anyhow.  They all have gain of 2-3-4. And the YO186 is right there. The all have 30-40 on grid and semi-identical size with YO186 with YO186 being a bit larger. The all 10-12W on plate with YO186 15W but I think here is where the YO186’s larger balloon is in advantage. So, I think the YO186 with RE604/KL71403 have found its family.

Looking at the externals construction of Telefunken RE604 and Klangfilm KL71403 I kind of surpassed that YO186 is made better or I would say more refined. It would serially say nothing about sound or about the quality of materials were used. I was not able to found anybody who used RE604 and YO186 or KL71403 and YO186, so I have no idea how one stand against other. As one guys said to me: “Romy do not search anyone - you are the person to answer this question.” Perhaps I am, as there are very few YO186 users out there. I would be very interested to see how the RE604/KL71403/YO186 class tube would push against the 2A3/45/6A3 class and the 300B class.  Of course there is a great variety of differences between the different between of the same DHT tube, but still it is interesting to know if any common tendencies are there. it is very much might be that there is no important differences in any of it and it will all depends from how good the given tube was made. I plan in future to buy one RE604 and one KL71403 to see were the YO186 stands (as I have life supply of YO186) but first I need to found out the answer for the main question: how much S2 driver in context of Macondo will b e able to endure the YO186’s loading.

People out there usually load RE604/KL71403 to 3.5-4K getting from RE604/KL71403 1.5-1.8W. That might be a good start for YO186 if I run it at 57mA but sine I will be running my YO186 with no bass then something suggests me that I might end up with lover currant, higher plate impedance and might load YO186 to 7-12K. The “sucks” part in all of it that it is difficult to found out what I need without actually falling in something and recognizing of with what I do not need…

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