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2. EL34 Baby Huey Amplifier

The Baby Huey PP ultra linear EL84 is a design by member Gingertube.

https://www.diyaudio.com/forums/tube...baby-huey.html

Bas Horneman has also created an excellent wiki for this

https://www.diyaudio.com/wiki/Baby_H...EL84_amplifier

it was adapted by Marc (bandol83 R.I.P.) for the EL34 and others

https://www.diyaudio.com/forums/tube...amplifier.html

There are two versions, version one with an integrated power supply (for e.g. EL34, 6CA7, 6L6 etc.) and version two without an integrated power supply, the additional power supply board is required here (for EL34, KT88, 6550, etc.).

Various information and adjustments from the original thread:

Error in the old power supply board version 1:

the connections of the mosfet drain and surce are interchanged in the layout and must be rotated!
https://www.diyaudio.com/forums/atta...nik-sk-104-jpg

a mod for the power supply for a better output voltage (from Gingertube)

https://www.diyaudio.com/forums/atta...405_160239-jpg
https://www.diyaudio.com/forums/tube...st6148566.html