Bob has been making a few pair of these over the past 2-3 years & selling them on ebay. Most were 180-240 watts, but these monsters have the new KT-120 tubes & upgraded transformers, etc. They are stunning!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&hash=it em2a0f1b85e2&item=180642088418&nma=true&pt=Vintage _Electronics_R2&rt=nc&si=KYqRyNpOye1MFNPTmn9BduFb5 X0%253D
Here's the always interesting Q&A from the auction:
Q: Hi Bob. I'm a little confused, perhaps you can straighten me out. In the first part of the description, you state that "I designed and wound a massive new and powerful output transformer." Later, you mention "Though I have become pretty good at winding them myself, it takes too long" and "I had the thought of getting a commercial transformer company to make them for me according to my plans, but the cost was too high." So,to clarify my clouded brain, are the transformers installed in the BLACK BEAUTY your own handiwork? Also, you mention that "A switch that changes the feedback from classical (vintage) to contemporary." Obviously, by 'vintage,' you must mean a Citation-like sound, right? But by 'contemporary' do you mean more like a current solid-state unit, e.g., Sunfire, or a modern vacuum tube unit, e.g., Audio Research? I'm using other manufacturers names for comparative purposes only; I'm certain that both positions represent the "heart and soul" of Bob Carver! Thanks! -Dave Mar-21-11
A: Hi Dave, I can understand how you are confused because I'm confused myself. If I'm confused how could you possibly not be confused? Now you are making me think! Okay, here goes. I did teach myself how to wind them by copying the original units. Subsequently I changed the design from pie-wound to layer-wound, and have been more than pleased with the way they turned out. I used modern steel and segmented windings. Nobody wanted to pie-wind them - it takes too long, is very difficult, is too expensive and not necessary anyway. At this point in time the units in these Black Beauties are my own handiwork because I have not yet found a transformer house that will wind them for me (at least the way I want them wound), but I will soon. It's hard to wind output transformers - power transformers are easy - and I for one have developed a new-found respect and admiration for the handful of transformer guys on our planet who do it well. As for the feedback switch, "classical" refers to the amount of negative feedback = 20dB. "Contemporary" = 11dB. Modern tube amp designers often prefer less feedback than do vintage designers. That's mostly due to the fact that it's quite difficult to get substantial feedback around modern transformers (built with a rational budget in mind). Sometimes it seems that all the vintage units were designed as cost-no-object. Oh well, It's a good thing I love winding transformers! Hope I did not put you to sleep, Bob Carver
Q: Hi Bob- Not a very exciting question here, but I'd love to see how you package one of these amps for shipment, and I'd like to know which shipper you prefer. I hope you'll be making these until I can afford a couple! Thanks, Clay Mar-21-11
A: Hi Clay, Well, let's see. First I put some special soft cloths around each amp,then a plastic wrap around each one on top of the cloth. After that I put each amp in a box using foam corner blocks. After that, the box is then put inside a bigger box and lots more soft corner blocks plus bubble wrap is used to hold the inner box in place as well as to add extra cushioning. The whole big double box is finally taped closed and banded with nylon banding to hold the box together in case it's dropped down some stairs. Wow! At least I can describe the process faster than it takes to do it! Thanks for asking - I know lots of us want to know the answer to these important questions. I prefer UPS and the USPS. Bob Carver
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