EL12 Single Ended Amplifier D.I.Y

--Wel come to Site----------This site shown D.I.Y Single Ended Amplifiers-----almost valve amplifiers----some of digital staff--- ----Ham Radio --------Hi Fi sound to suppose be high end audio---etc etc-----from Yachiyo Chiba---Japan-------small city of Yachiyo located around 30Km west of down town of Tokyo ------very close to Narita International Air Port---

EL12 Single Ended Amplifier D.I.Y

this vcounter started 8th June 2025

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EL12 just like small EL156

using small high impedance audio transformer for 6V6 on 10th Mar 2025

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EL12 Single Ended Amplifier

The specifications are very similar to the EL3N, but to be precise, it is a European pentode tube that is very similar to the EL11.
Therefore, the grid bias is very low, 5 to 6V. There are many vacuum tubes with similar specifications. The EL12 has a plate voltage of 280V and 70mA.
The specifications say 8W, but I think it is actually around 6W. The cathode resistance is 100 Ω.
The circuit diagram is the same as the EL3N. The output transformer uses a large transformer from Hat Audio. The model number is HO 808 ll.
It is the same specification as the TANGO U-808, but the characteristics are similar to the XE-20S.
It is a matching band type transformer. Mr. OMI said that, in terms of the specifications, the primary winding uses thick wire,
so more current can be passed, resulting in about 10% more output.

HO-808 ll and power transformer HO-808 is new one

this vcounter started 8th June 2025

Your OS of PC is




If did you see X11 means family of UNIX and Navigator.

EL11 Single Ended Amplifier just like younger brother of EL12 4 W rms mono on 2026

It has a power output of 4W. You might think of its output as being similar to that of a 2A3; however, as it is a pentode, the actual usable output is less than 3W. (In practice, a 2A3 can deliver over 5W.)
While the 2A3 possesses that level of power, I believe this European pentode has the edge when it comes to sound quality. It is an audio vacuum tube with performance characteristics reminiscent of a scaled-down EL156.
It belongs to a family that includes the EL3N and the AL4. It is an excellent audio vacuum tube, sharing similar performance traits with others in that same family.

Single Ended Amplifier D.I.Y

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