luvdunhill

yeah, Steve has a set. I'd need the lower impedance versions. I'm consider ransoming his new phono preamp for them.

I'm looking for some Orthos to experiment with. Basic config will be a "preamp" capable of putting out balanced ~30v per leg, then run into a balanced TVC then to the cans. I have a feeling this will really show what Orthos can do. Just need to find some phones

anyone happen to have some extra IRF510 and IRF9510? I need 2 of each, unmatched is fine.. they're just CCSs...

just a guess, but perhaps orthos will prefer a transformer coupled amplifier?

I'm using those same PCB high density RCA jacks on my preamp. Do you like them? Other than that, your pictures don't really capture much of the circuit. What are all those transistors on the long heat sink.

extremely tweaky. my main pain point with it is that it sounds totally freaking awesome the first time you listen to it... I mean, incredible. Then you realize that you can tweak it more (especially VTA, but I can hear differences in .05g VTF for example) and you start to dial it in for a particular record (recording idiosyncrasies, record thickness, your current sonic preferences of the day, etc.) and it sounds even better... then you start doing this for every record... I mean, it doesn't sound bad with an average setup, but once you hear the detail this thing offers when setup just right, it's quite amazing... then there are the other models... at this point, I'd love to finish up some projects and just tweak and listen... soon it will happen, and it will be a wonderful day!

any details on the transformers? who winds them, and what else do they wind

yeah, I'll have to think about it... I'm assuming you may need to decrease the source resistors for the second pair of transistors? I'll think some more when I get back into town... man, Seattle is a fun place

Those are 2 excellent choices. Though, I'm curious what the difference in price would be between a Spacedeck with Tri-planar arm. I really don't like the Nottingham arms. My next upgrade (well, "commercially available upgrade") will be a new arm for my Space Deck. That being said, I like the Galibier tables as well...... tough one. It would be easier if you would have chosen crappy tables and the Nottingham.. then I just would have been a Nottingham fan-boy... but, you really raised the ante there.

easy. yes. and adj bias for the Koss so you can get moar bass.

This is a good sign.. no post from Pete.. Probably in analog bliss now.. I'm off to bed...

sweet!

yeah! My R-core transformers just shipped from Hong Kong, so I'm going to need those heat sinks Now, if I can just stall Pete somehow.... I'll get your Pearl up and running before his

swt61: so, is the post office broken? yes, I'm being an ass but, I'm still a nice guy kinda

man, I figured my wife was the only one who used that line ...

yes, the 47k is the Zin of the circuit. So, any additional loading is simply placed in parallel with this 47k. so, all those "standard" loading values you see for a given cartridge, the additional question that always needs to be asked is what is the input impedance of the phono preamp. No one asks though, which is funny. I'm sure it is usually 47k, but still ...

you look like you may not be feeling well? wait, is that the baby I hear?

amateur. check out my board pic I posted and zoom in, you'll see what I'm talking about. for everyone else the easiest way to install this is just bend the leg from the capacitor over before you clip it and solder it in.

heh, I just looked at your pics.. it's not populated. Dew eet! It's from the negative terminal of C15 to the hole that's right below C15. You can see an arrow pointing to a white line on the top of the silk even when C15 is installed. The text is "behind C15". This the negative of the caps will be connected to that empty hole, and hence the top ground plane.

heh.. check out the silk screen near C15.

have you assembled the second board? (i.e. do you have some extra parts laying around?)

for Q3 you should have around 0.6V across the base-emitter junction. You didn't identify which reading was which leg.... I'm going to guess the collector is at 30.6v (based on the output of the psu regulator voltage) in which case something is wrong here. Verify R13 and R16 are the proper values and R13, R16, Q3 are soldered properly. If you have a diode check function on your meter, verify that you are getting a diode drop across base-emitter, but I'm guessing this critter is bad. Also, did you remember to solder in the shorty to connect the top and bottom ground planes?

okay. voltage across R2? voltage after regulator (R8)? did you install R27 (47k)? voltages at all three legs of Q5 and Q3 (ok, and Q4)? edit: referenced to ground are both boards not working? verify all resistor values.

you mean this kind: Professional Engineer - Wikipedia, the free encyclopedia or -=this=- kind?

yup, so true.