The warm-up time and characteristics are exactly the same as WE274B, This is 5R4GY made by RCA, which is famous as an alternative tube.
274B has become very expensive, so more people are using this vacuum tube. As a result, the number of these vacuum tubes has become extremely low. And it's getting expensive.
Domestic products include NEC's 5R4GY, which is also labeled 274B. It seems that it has been used as an alternative pipe since then.
It is released by various manufacturers.
*In addition to this product, there are also products made by various manufacturers, so please contact us. However, as mentioned above, it is becoming difficult to obtain, so please check the stock. Please place your order.