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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Summertime Blahs posted by drlowmu on July 19, 2014 at 07:06:20:
Thanks to DeathTubess pestering I have been measuring amps with ARTA and STEPs and tweaking feedback loops in a few amps.
major breakthrough here for me. quite exciting!
I recently had a failure of my 2a3 amp after reinstalling the 12ax7 and I've benched the thing while I figure out what to do next.
When I fished the big fulton power cord in to connect it to the primary 120 connection on the power transformer I managed to damage the jacket on the secondary wiring.. after some time I blew a fuse and ended up with a dead short. So the power transformer and the amp is sitting in a pile.
just prior to that I had reduced distortion from 5% at one watt to ~ 1.5%, just from changing from Hammond 1628SE to Magnequest DS-025. No other changes.
Again, measuring with ARTA, major breakthrough.
Last night I tried several different screen supplies, last of which was a low resistance choke after my B+ supply.. similar to the recomendations in your old JLH docs (jeff), and found a .02% decrease in distortion vs tying to the last cap in the B+.
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- RE: Summertime Blahs - rage 13:46:38 07/24/14 (0)
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