NOSValves Posted January 7, 2004 Share Posted January 7, 2004 ---------------- On 1/7/2004 9:48:12 PM DeanG wrote: Really, what are they charging for? Must be the fabulous iron! Maybe it's the paint job ... who knows. ---------------- The charging to fill there pockets with cheese !! There charging for the name ! The difference in cost to wind a lousy transformer and a great one isn't much really when talking in this context. Quote Link to comment Share on other sites More sharing options...
Deang Posted January 7, 2004 Author Share Posted January 7, 2004 "The Rack". Appropriately named I do believe. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 ---------------- On 1/7/2004 9:53:46 PM DeanG wrote: Who needs separation. The Blanket Effect sounds pretty cool too. ---------------- Man you need to slide your chair up about 3 or 4 more feet ! Your not getting the absolute best sound out of them yet ! I'm not kidding try it !! Make them horns shoot right in your ears like headphones dude. They beat the sh!t out of Sennheiser's or Grado's LOL !! Craig Quote Link to comment Share on other sites More sharing options...
Deang Posted January 7, 2004 Author Share Posted January 7, 2004 I just had the chair pushed back so I could move around better. About 7 feet back works pretty good for me. I need a high chair. I might have to borrow Ian's. Not much in those amps really -- pretty impressive. When I squint my eyes they almost look like SET amps. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 Man I can't wait for you to get the Schematic !! Where in the hell is the b+ filter capacitors ?? How the hell are they cleaning the ripple ? Craig Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 I bet if you close your eyes and think real hard they sound better also Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 7, 2004 Share Posted January 7, 2004 Dean, the schematic that you posted looks like it's single ended parrallel output pentodes. Is it? Rick Quote Link to comment Share on other sites More sharing options...
Deang Posted January 7, 2004 Author Share Posted January 7, 2004 Rick, well, I thought it was straight up push-pull running in Ultralinear. Of course, I have been wondering about the phase splitting. Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 7, 2004 Share Posted January 7, 2004 That's what I saw, a common input to the driver tubes #2 grid from the preamp. Rick Edit That looks like a simple circuit to build if you can get the properly wound output transformers. There are no ultralinear taps on the trannys either Just a feedback tap on the secondary. Quote Link to comment Share on other sites More sharing options...
sfogg Posted January 7, 2004 Share Posted January 7, 2004 Dean, This is a pic of the inside of an original: I think the originals were class A push pull which is why they only put out 15w. Shawn Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 I not sure about what Rick is seeing here ? Craig Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 oops DP Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 7, 2004 Share Posted January 7, 2004 Nope the # 1 grid of the upper driver is fed from pin 2 of the input plug, the lower half is fed from the difference in potential caused by R8 in the plate circuit. That would make a complimentary output to the grids of the output tubes. It's PP allright. Knew it all the time. Mark, Help me out here! Rick Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 Rick, That is what I seen. The funny thing about it is the output transformer taps. I'm looking and looking and I'm confused here. Where is Mark when we need him LOL !! U and W leads have me scratching my head. I think its wired in Pentode and the U and W are what controls the bias. Craig Quote Link to comment Share on other sites More sharing options...
Painful Reality Posted January 7, 2004 Share Posted January 7, 2004 ---------------- On 1/7/2004 10:11:18 PM NOSValves wrote: Man I can;t wait for you to get the Schematic !! Where in the hell is the b+ filter capacitors ?? How the hell are they cleaning the ripple ? Craig ---------------- The two filtering caps seems to be located near the power transformer under the larger metal cover. Quote Link to comment Share on other sites More sharing options...
Deang Posted January 7, 2004 Author Share Posted January 7, 2004 There are no ultralinear taps on the trannys either Just a feedback tap on the secondary. So what is then, just an old fashioned dirty pentode amp? Coooool! Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 7, 2004 Share Posted January 7, 2004 Craig, it looks cathode biased by R12 and the resistance/reactance of the special winding in the OPT> Rick Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 Deano, Its Pentode for sure ! But I bet very hard in the A side of Class A/B1. Of coarse were all looking at the wrong Schematic LOL !! Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 7, 2004 Share Posted January 7, 2004 "So what is then, just an old fashioned dirty pentode amp? Coooool!" Dean,It's running Quasi-triode appearantly. Grid four is tied to the plates through L1 like you would put a 100ohm resistor in a Dynaco between the plate and grid 3 to run in triode mode. And grid 4 is missing in in action. D@mn that Scott 299c with Craig's parts sounds good. Rick Quote Link to comment Share on other sites More sharing options...
NOSValves Posted January 7, 2004 Share Posted January 7, 2004 Rick, That is classic Pentode L1 is a normal choke nothing Triode about this !! Quote Link to comment Share on other sites More sharing options...
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