You might contact porschecab (Dan) at Edwards A/V in South SF. He’s in your area and seems knowledgeable.
Tube tech-hobbyist In San Francisco or Northern San Mateo sought
I screwed up a simple modification by doing something real stupid and would like to get an Elekit headphone amp repaired. Pretty simple single ended amp with two tubes but I can't do it myself. Power supply seems ok. It's like a $300 unit used so of course I'm looking for a reasonably priced repair. Thanks, Tweaker123