Give them the first page that comes up with the list of the Tube CAD Journal's past issues: www.tubecad.com/index.html
Subject: ES headphone Amp
I just discovered your great webzine. Thanks. How do you do it for free?
I love the look of the rack-mount version of your headphone amplifier with the tube sticking out of the top and the protecting bars. Way cool. So here's the question: Who did the metal work for you and could you offer a kit with that chassis? I have a pair electret headphones that I haven't listened to in a long time because my 7.5 watt 300B amplifier cannot drive the step-up transformer.
Thank you for the compliments. As for kits, we have received several requests for kits in the past, but no kits are available from us, just ideas and software. I have tried to convince an excellent maker of electronic kits to carry some tube projects, as they offer high quality PCBs and parts at a reasonable price. They almost went for the idea, but the of fear the high voltage involved (and the possible law suits) dissuaded them.
I bought the chassis from a firm in New Jersey a decade ago and punched the holes in the top plate myself. The "cool" bars are just black anodized rack mount handles ($3.00 each). This piece of gear gets more comments from people than any other tube piece I have ever built. One person told me he thought it looked like expensive Swiss medical test equipment.
I too used to own a pair of electret headphones, Audio Technica ATH-7's I believe, that sounded very neutral and accurate, but one listen to the Stax Lambda Pros made a convert of me. Still, your headphones will sound much better through an OTL amplifier, as the