I just bought a pair of NEC 12R-LL3 tubes, manufactured in 1960, under the impression from the listing that they are a Japan version of 12AU7. Now I'm less sure, not having found much information on them at all, and what I found seemed a bit contradictory. I was going to roll these into a Kingko 101 amp in place of its stock pair of 12AU7s. Does anyone know about these? I suppose caution is advised unless I'm sure they're suitable. Which I'm not, at the moment.
From what I can fing, it is similar to a 6BK7B, a low gain 12AT7. Designed for use in VHF television as a RF oscillator.
Not a lot of use as an amplifier.
Here is some of what I found;
https://radiomann.sakura.ne.jp/HomePageVT/Tube_Index_30.html
Not a lot of use as an amplifier.
Here is some of what I found;
https://radiomann.sakura.ne.jp/HomePageVT/Tube_Index_30.html
Thanks. Ah well. I'll start again, more carefully this time. I see that NEC made AU7s anyway, which I can get for about what I just paid.
This link is informative. There is a table with key operating characteristics of similar dual triodes, and it is not so close to anything else.
NEC 12R-LL3
NEC 12R-LL3
