omg.... [message #32185] |
Sat, 27 October 2007 18:00 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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are y'all just not building anything these days? Lots of fun over here, tearin' into a few nice output transformers, building some more amps...:) cheers, Douglas
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What'cha have in mind? [message #32186 is a reply to message #32185] |
Sun, 28 October 2007 09:19 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18752 Registered: January 2001
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Illuminati (33rd Degree) |
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I'd like to do a nice phonp stage build. Seems like it would be a fun group build. Some of the guys were talking about a switcher. Easy to do, but still worthwhile. Could do them together too.I always stay pretty busy, and I have a list of things in front of me. I used to be able to get through new projects much faster, but these days, I have a lot of priorities. I just finished with the Prosound Shootout, which is a pretty good amount of work to do, actually. Before long, it will be time to get ready for the Lone Star Audiofest. In between times, I have two basshorn projects I'm working on, one new and the other an improved version of an existing model. What have you been up to these days?
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Phono pre [message #32187 is a reply to message #32186] |
Sun, 28 October 2007 10:17 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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hey-Hey!!!, I have been working out one for a while now. To do it with a single PS, I'd have to work out some details with Heyboer for winding one with a few electrostatic shields( to isolate the heater winding and primary from the HV). It would be easier with multiple dual-bay transformers( two chassis, yes? )It is fairly simple, gain stage, pasive RIAA gain. First stage will use a pair of 6BK7's in parallel( -3dB in noise from a single ), and terminate with a single 6BK7 stage with a DN3545/2540 mu-follower CCS. Schematics soon I'd say...:) cheers, Douglas
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Re: Phono pre [message #32195 is a reply to message #32192] |
Thu, 01 November 2007 13:53 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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hey-Hey!!!, I think I won't regulate. Choke input above critical current will be fine I think. I'll also need a smaller bi-polar supply for the MC-stage's OP amp. Two chassis with power on one and signal on the other. DC heaters amounting to about an amp and a half of 6.3 will be needed. Again, LC filter with good diodes. For B+, a pair of damper diodes should make a dent in the overkill quota...:)I will start with something quite like the Bottlehead seduction, but with a relaxed PS instead of run to 99% of redline, and tubes chosen for something other than minimum filament draw. cheers, Douglas
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