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In Reply to: Thank you! RH Designs SEP EL84 build is done posted by eedork on March 27, 2007 at 18:55:58:
So you like it ;-)I think once you get a choke and sort out the power supply all will be well. Please let us know IF you hear any difference if and when you regulate the screens and if so then if is better to your ears.
I have tried every which way I can think of to run an EL84 SE (I am an EL84 fan) and this circuit has beaten them all.
Follow Ups:
Thank you for pointing this circuit out again. It really is simple and elegant and sounds very nice.I will let you know when I get the power supply sorted out and if I decide to make up some Maida style regulator PCBs for the screens.
I also love EL84s - they are small and sound excellent in almost any configuration. I actually just came across another very interesting tube that I might experiment with - the ECL86 (it caught my eye as I was rummaging through my box of random tubes). It is a pentode and high gain triode in one envelope. I do not know the details yet, but you could probably build a nice little amp with just a single ECL86 per channel. Simple and small - I like it.
-Matt
Thanks for the heads up with the ECL86, I am familiar with it, I have one but have never done anything with mine either. Its similar to a 12AX7 and EL84 in the same envelope.
A popular dual tube similar to this is the 6BM8 which has quite a following in Japan. The 6BM8 was used extensively in the audio output of TV's.
More like a 12ax7 & a 6v6, notice the power out & beam tetrode construction. I use these in p-p. The Italian TNT www page has a PCL86 circut that is easily changed to 6.3v filament for ECL86 (follow link below). Poke around that article & discover triode-straped or NFB pentode circut arrangement as well as Volume control. The ECL86's *dense & focused* sonic signature has been decribed as light-years beyond the 6BQ5/EL84. Previously mentioned here as exceptionally linear in triode-strapped mode. Widespread economic use (due to the dual sections) in TV & portable phonographs probably gave it an un-deserved low-fi reputation. The ecl-xx family sibling 6BM8/ECL82 has slightly less power out but is/was in current Russian production. Today, 6gw8/ecl86 are becoming scarce.
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