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In Reply to: RE: RH84 OT posted by vetmedrobert@gmail.com on August 07, 2014 at 12:57:40
Maybe you didn't find your answer in that 4 hours, but this hobby is all about learning things. Just part of the journey.
Follow Ups:
Yeap no shortcuts but you have lucked on the rh schematic from memory it has cathode feedback which is really big on bass improvement over non cathode feedback solutions. Electraprint do some beautiful simple EI core trans a little more usa and quality in them then the other cheaper ones out there. I wish EP would wind some cathode feedback windings. You should ask for custom order.
You have to stay positive or just go build or buy a chip or T amp instead. Less work to get them to work well.
From a 10 second search. No cathode feedback winding. Just a straight forward SE EL84.
Ha !! Cute schematic to see. Could we beneficially simplify it? I "see" three or four areas:IMHO, the EL84 simply "begs" to be replaced by the better-sounding 6005 / 6AQ5, and the 0.22uF series coupling cap BEGS to be eliminated totally, replaced by a direct couple, two paralleled Kimber AGSS runs. Eliminate all the fancy schmancy feedback loops, and while were are at it, give the amp a decent ( low DCR ) power supply for goodness sake.
People like the above circuit it 'cause its two stage, transparent, and they just have not heard / built what I described above !! Front end tube is good sounding choice, style, a keeper.
Except for my power supply, I may have outlined the tube complement in half of Eli's ElCheapo !!! A SE version I propose. Direct coupled.
Jeff Medwin
Edits: 08/08/14 08/08/14
I'm seeing partial feedback....from plate to plate
Not so straight forward...
http://www.tubecad.com/march2001/
Stuben
The design uses "Schade" feedback which sets it apart from many other SE designs.
The plate to plate feedback is not in the same boat as cathode winding feedback, to which I was responding.
It is amazing that this amp has a whole following given that it varies by one resistor from normal. That feedback technique has been around for 80 years.
True, but Mr. Kitic presents it in a thoroughly developed and well documented fashion, making the design very approachable and inexpensive to build. Also I gather they sound quite good. I am in fact currently building a variation. I'll report back on what I think when the project is done.
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