This vacuum tube has a very low bias. The plate voltage for a bias of -6V is around 300V. In terms of characteristics, at a voltage of around -18V, the polarity makes it about 350V, which is the same as the plate voltage of KT88.
Then set the self-bias to the rated 160Ω. In the end, it will be the same as KT88. It will settle at about 170Ω. It's -6, but KT88 is actually around 390Ω. I think it will be a cut and try.
The circuit diagram has not been decided yet, but I think the same circuit as LV-60 is good. If the plate voltage is low, I think one stage of ECC88 is enough. If the plate voltage is high, I think a cathode follower is good.
I think this circuit will produce more than 20W.
The EL156 does have a low grid bias, but I think that if high voltage is applied, the characteristics will become the same as KT88. The good thing about this vacuum tube is
Low bias. In other words, a low anode voltage will result in a large anode current. That's probably why it produces such a good sound. However, the representative European pentode is the EL34.
I think you can use the EL34 in a similar way. I've confirmed that when you run a high current through it at a low bias, it produces a sound similar to that of an EL156. This means that the EL34 is an excellent pentode.
The EL34 is also a pentode that operates at a low bias. It produces a completely different sound from the KT88. Of note are European pentodes such as the AL60. These can also produce 8W.
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Lay out of Amplifier 2024 Feb
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EL156/6G-B8 Single Ended Amplifer DIY
