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Posted on Monday, March 08 @ 04:54:06 EST by Shane
Been hearing about the RH84 and its bigger brother the RH807 for a while now so figured I would give one a try. Got a EL84 SE transformer set out of some sort of recording equipment off eBay and fired up the soldering iron. Its a unique cathode biased pentode schematic with a short local feedback. You can read more about the design on RH's website. Most the the technical information is in the RH807 section:
http://www.tubeaudio.8m.com/
I had most of the parts in my collection except the 10uf caps and 1M grid resistors so it was a pretty quick build. Initial listening though my test speakers is favorable. I can hear a tiny bit of hum as I did not have a 20H choke around so just used a resistor. I will buy one next time I put in a parts order to cure that. Click the picture for more information and undercarriage shots.
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