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ping deathtube 667 re: starved filaments
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Posted on April 10, 2014 at 13:02:14 | ||
First, thanks for your continuing work and postings. Since you have the ability to test this like most of us don't, would you please try lowering the filament voltage of whatever DHT circuits you do these THD tests on? For example either use a separate filament transformer and put a variac in front of it, or use low ohm pairs of resistors in series. Run what ever sim you want at regular filament voltage and then try as suggested, perhaps at two lower levels. If it was as simple as dialing up the variac, then that shouldn't be too much trouble ? Here's what Steve Bench produced along with this: http://diyaudioprojects.com/mirror/members.aol.com/sbench102/dht.html I'm curious if you'll find similar with a complete circuit, rather than an isolated test using a plate resistor. Thanks in advance |