laxx Posted November 5, 2007 Report Share Posted November 5, 2007 Haha I guess it's because I attended a school where "oh snap" and "oh shiiiii-" were the most common phrases for expressing realization, recognition, surprise, acknowledgment, and/or appreciation. I remember the days of "oh snap." It was over 10 years ago. Quote Link to comment Share on other sites More sharing options...
slwiser Posted November 23, 2007 Report Share Posted November 23, 2007 Jim is ready to take pre-orders for his new headamp half-kit. Check out his latest blog update: http://www.hagtech.com/blog07.html Quote Link to comment Share on other sites More sharing options...
n_maher Posted November 23, 2007 Report Share Posted November 23, 2007 I have to be brutally honest, $100 for a PCB, instructions and what sounds like just standoffs and a few other minor parts doesn't excite me enough to order it. Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 23, 2007 Report Share Posted November 23, 2007 I have to be brutally honest, $100 for a PCB, instructions and what sounds like just standoffs and a few other minor parts doesn't excite me enough to order it. My sentiments exactly. http://www.hagtech.com/images/castanetschem.jpg That's a pretty easy p2p job. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted November 23, 2007 Report Share Posted November 23, 2007 That is no way to do low impedance headphones, with one winding completely unterminated. Needs to be wired with a switch that puts both secondaries in parallel for low impedance phones. Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 23, 2007 Report Share Posted November 23, 2007 That is no way to do low impedance headphones, with one winding completely unterminated. Needs to be wired with a switch that puts both secondaries in parallel for low impedance phones. I didn't even notice that, but I didnt look at the wiring over there much. That does look pretty silly. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted November 23, 2007 Report Share Posted November 23, 2007 That is no way to do low impedance headphones, with one winding completely unterminated. Needs to be wired with a switch that puts both secondaries in parallel for low impedance phones. Any other thoughts on the circuit? I'm planning a very similar build for my first tube amp with CCS instead of chokes for the plate load. Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 23, 2007 Report Share Posted November 23, 2007 To my untrained eye (Kevin can correct me) it sure looks like a pretty run of the mill common-cathode (unbypassed) transformer coupled amp. Sound quality will greatly depend on the output transformers that are chosen. I don't know what was spec'ed as I really didnt look into the parts list. Quote Link to comment Share on other sites More sharing options...
n_maher Posted November 23, 2007 Report Share Posted November 23, 2007 I don't think the parts list is available, Jay, that's part of what would come along with the documentation of the amp. Quote Link to comment Share on other sites More sharing options...
slwiser Posted November 23, 2007 Report Share Posted November 23, 2007 That is no way to do low impedance headphones, with one winding completely unterminated. Needs to be wired with a switch that puts both secondaries in parallel for low impedance phones. Partial answer: Hey, that would be great, if only there were two secondaries! The 119DA has only one with two taps (autoformer style) of different ratios. No possible way to wire in parallel. Quote Link to comment Share on other sites More sharing options...
aerius Posted November 23, 2007 Report Share Posted November 23, 2007 To my untrained eye (Kevin can correct me) it sure looks like a pretty run of the mill common-cathode (unbypassed) transformer coupled amp. Choke loaded parafeed, with ultrapath connection and bypassed cathode. It's not something I see every day. Quote Link to comment Share on other sites More sharing options...
Nanoha Posted November 23, 2007 Author Report Share Posted November 23, 2007 Choke loaded parafeed, with ultrapath connection and bypassed cathode. It's not something I see every day. What are your thoughts on what KG said? Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 23, 2007 Report Share Posted November 23, 2007 bypassed cathode. It's not something I see every day. I think I meant to write bypassed. Either way, it was a bit different that what I was referring to, hence my apprehension. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted November 24, 2007 Report Share Posted November 24, 2007 Any other thoughts on the circuit? I'm planning a very similar build for my first tube amp with CCS instead of chokes for the plate load. Anyone else have an opinion on the circuit? Quote Link to comment Share on other sites More sharing options...
aerius Posted November 24, 2007 Report Share Posted November 24, 2007 What are your thoughts on what KG said? Fully agree. I learned the hard way from personal experience. Any other thoughts on the circuit? I'm planning a very similar build for my first tube amp with CCS instead of chokes for the plate load. Better hope you have Grados and a source with a healthy output. The circuit has very little gain so with Senns or AKG's you might well run out of volume. I'd say try out the Less-pressivo, but those 6C45P tubes are pretty twitchy so you'll have to do a good job on your layout and grounding. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted November 24, 2007 Report Share Posted November 24, 2007 I'm actually planning on the Less-pressivo with a 6H30, and I'm using RS-1's. I just asked about thoughts on this schematic as it's similar in idea to the Less-pressivo. Quote Link to comment Share on other sites More sharing options...
deepak Posted November 24, 2007 Report Share Posted November 24, 2007 I'm actually planning on the Less-pressivo with a 6H30, and I'm using RS-1's. I just asked about thoughts on this schematic as it's similar in idea to the Less-pressivo. What transformers are you using for your Less-pressivo? Hammonds? Quote Link to comment Share on other sites More sharing options...
aerius Posted November 24, 2007 Report Share Posted November 24, 2007 Donuts are your friend. The Amveco 6208X series transformers work great as parafeed or push-pull output transformers. I used them in my 6C45P and 13EM7 test builds, both were parafeed output. I think they're better than Hammonds, even though they're meant to be power transformers. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted November 25, 2007 Report Share Posted November 25, 2007 I was going to go with the hammonds, but aerius' suggestion to use a toroid intrigues me. I've read about a couple applications where they work well on output. Of course, if I like the sound enough, I could end up getting a set of better output transformers like Elecra-Prints or Lundahls. Quote Link to comment Share on other sites More sharing options...
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