Daddy Dee Posted February 24, 2005 Share Posted February 24, 2005 ---------------- On 2/24/2005 8:20:35 PM Erik Mandaville wrote: . The most sure way of getting me to try something would be to tell me it's a waste of my time to do it! Erik ---------------- Erik, This will never work and will be a complete waste of your time. Especially the part about the artistic contrast between slick looking new trannies and tubes on top of a scrappy looking chassis! Are you getting increasingly motivated? Seriously, I think this would be a good candidate to send off to VTV for review and photos. Creative aesthetics on top of fabulous sound. hmmm Quote Link to comment Share on other sites More sharing options...
Painful Reality Posted February 24, 2005 Share Posted February 24, 2005 ---------------- On 2/24/2005 9:16:49 PM sfogg wrote: If you have the PP 300B circuits handy I would be interested in taking a look at them. ---------------- If you're interested in 300B PP amps, here are some designs I like: http://www.plitron.com/PDF/kobayashi1862.pdf. Plitron are superb OPTs, providing you don't mind to end up with an amp that is slightly smaller than a car (but probaly heavier). VTV vol 12 featured a nice design by Kevin Kennedy. You could download the article from the Svetlana website but since it has been down, the only is to get a back issue from VTV. Or find someone that was clever enough to save the PDF file. Which I didn't do... http://www.bonavolta.ch/hobby/en/audio/300b_8.htm. This is the grand daddy of all 300P PP amp. From my experience, you can't go wrong with anything that was design by Western Electric. Most "innovative" designs that are the lastest hoop-laah (do I hear Ultrapath?) have been used in WE amps back in the 30ies. A good read on the innovations from WE can be found here: http://www.nutshellhifi.com/library/Rosetta_Stone.html. The Amity is quite inspired by the WE 96A. http://www.nutshellhifi.com/IT-Triode-Amp.gif. Lynn Olson also came up with the Karna and the Aurora but unless you have really deep pocket, those are not for the faint of heart. And finally this design from Al Brant, probably the oldest DIYer in the USA, schematic is rebarbative but I feel it's rather good. http://www.bonavolta.ch/hobby/en/audio/300b_9.htm Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted February 25, 2005 Author Share Posted February 25, 2005 Painful Reality just covered all of them but the last one. I don't have that! Kevin Kennedy does some pretty neat stuff, and his circuit looks great. It's a little more involved than some, as is the Westeren Electric variations, but since there isn't a rush and no race is being run, one of them could make for an enjoyable long term project. Shawn: I have an extra punch (Greenlee) for the four pin socket. It's designed to be used for the ceramic socket (great quality for cheap!)that is mounted beneath the top-plate. If this really becomes something you would like to do, let me know and I'll send you the punch. I don't need two of those things. I thought the one I used on my Horus was dull, since I nearly broke my arm trying to punch through the thick top plate. After lubricating the threads, which I would have done the first time around if I had half a brain, it went through moderately thick aluminum like butter. I also found a couple of other PP2A3 circuits that look like they would be very good candidates. With some fairly straightforward modification it would be possible to do either for other triodes like the 45 or 300B. In the case of the 45, though, maybe something like a PP parallel, with a quad of 45s would be interesting. Come to think of it, I think I saw something like that in VTV. Dee: That's almost enough to send me to the junk yard today! Quote Link to comment Share on other sites More sharing options...
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