Вопрос про старые усилители

Не много не по теме может быть. Не стал открывать новую тему. У меня усилитель LUXMAN SQ38D. Вышла из строя одна лампа. Купил уже жду. Но на всякий случай покупаю все, но по одной вопрос по аналогу. Информации вообще ни какой не нашел. Лампа 6RA8. Может кто что-то знает?  

Точно:

NEC 6R-A8 is an indirectly heated Triode 9pin mT tube (just like a EL84/6QB5).
Please note that this tube was designed by NEC (Nippon Electric Co.) and made "only" by NEC (no other tube manufacturers made this tube, Toshiba had the 6G-A4 that rivals 6R-A8 tube).
And this tube was originated from 6BK5, and the NEC modified it.
As a result, you can see that this tube has a screen grid internally connected to plate.
The characteristics of this tube are kind of a famous 2A3 with higher input sensitivity (i.e. similar plate resistance, higher gm, higher mu).
Now, this tube is a very grare itemh even in Japan.
I usually donft see it in catalog listing of almost any tube broker in Japan.
Even when I see it (once a year or so), the price is unbelievably high.
I know that NEC made this tube at least somewhere around 1980s (I remember I bought this tube when I was a kid).
So I donft think there was any export problems for this tube.
Lux used this tube for the Type 38 integrated Amp (they changed to 50A-C10 on later models) and used for their gKith amps.
These tubes popped-out when Japanese Tube makers stopped making 2A3, and have greater input sensitivity but unfortunately the linearity is not as good as the 2A3 (well most high gm tube have this tendency).
And since this tube was not so expensive, the material and construction is just as a normal tube in spite of having plate dissipation of 15 watts (and 6 watts for heater).
So you have to be careful to not overload this tube (it is a mT tube!) .
It does not use carbonized nickel plate or fancy glass envelope like the Bendix Red Bank tubes
Since it is almost impossible to obtain these tubes, and if the tube fails, the only way to salvage the amp is to modify it accept more popular tubes, but this is not easy.
Here is the Spec for this tube (may be useful).
Pin1 IC, Pin2 K, Pin3 G, Pin 4-5 H, Pin 6 G, pin 7-8 IC, Pin 9 P. (must leave IC open!, both grid pins must be connected for heat dissipation)
Max ratings
Eb=350V , Pp=15W, Ik=120mA, Ec1=-100Vmax, Rg=0.1(Fixed) 0.25Mohms(Self)
Heater 6.3V 1.0 A
Gm=10.5 (mA/V) rp=0.9Kohm, u=9.7  
(Self Bias P-P) Eb=270V, Rk=260 ohms(for 2 tubes) RL=5K (p-p), eg1(g-g rms)30V
Ib=80 to 120 mA (2 tubes) Po=12Watts , KF=3%

http://web.archive.org/web/20000919145504/http://www.asahi-net.or.jp/~UP2J-KNST/tb-power2.htm

Excusez-moi, mais c'est du delire.

1. В таком случае, займитесь тем где слышать не надо. Судя по Вашим перлам, аудио совсем не Ваша тема.
2. И на уровень инфантильных фантазий не стоит скатываться. Никто не писал того, что Вы пытаетесь, столь неуклюже приписать.
Найдите в себе силы, вести себя как взрослый человек.