EL84 Amp Baby Huey

Posted on Feb 7, 2014

This design is based upon an ECL86 Amp design posted by Yves quite some time ago. This design uses shunt feedback to reduce the output stage rp and thus better drive the limited primary inductance of cheaper output transformers. Regardless of that, the result is good enough that its worth using reasonable quality transformers and while the common

EL84 Amp Baby Huey
Click here to download the full size of the above Circuit.

Hammond 1608 (Raa = 8K) will work well, it really deserves something a bit higher quality (more expensive). It can be used without the Ultralinear connection BUT performance would be degraded. I believe it is suitable as a "newbies" first project and it will certainly out-perform most of the simple "suitable for newbies" designs I have seen here and elsewhere. The MJE340s in the bias blocks don`t need heatsinks if mounted against the chassis (they dissipate about 1/2 a watt) else a small heatsink would be advisable.

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