luvdunhill

so, the 1% TH parts are being discontinued by Panasonic in favor of some 5% SMT parts... lame.. so, the substitute for P3884-ND was P3931-ND which are 2% parts and I added an extra 50% to the quantity to give me a few to match with. The order is being filled at the moment and I hope to have the parts and the kits shipped by the end of the weekend. To answer Nenso's question, I'm probably not the best person to ask if the parts chosen are high quality and well matched, as I'm putting the kits together. Of course I think this is the case I will say that this project should out-class everyone's table/arm/cartridge on this thread, mine included, and I can let you know how it compares to my Xono.

I assume so. I just model the load with a capacitor across the outputs, no resistive or inductive components. You'll have to ask Kevin I suppose.

I did a SPICE simulation with the increased bias of my KGSS and the higher load and it wasn't all that bad...just needs more voltage swing...

The PS2 has a step-up ratio of 1:120, with a bias voltage of 1.2kV. The PS0 has a step-up ratio of 1:60, with a bias voltage of -1.55kV So, the answer is "yes", assuming you have a bias supply that can adjust in the range of 1.2kV-1.55kV. I happen to have one. The KGSS is not a good match, not nearly enough juice, so you're talking Blue Hawaii at a minimum. These phones measure right at a 330pF load, including cable.

dude you totally blew your cover.. anyways, just give them a call and order on your own, or go with the case that DigiPete is proposing. one brief update... after a small embarrassing mistake, I stuffed 6 boards this weekend with the required resistors... according to Mikhail's math, this should be perfect for a Quadraphonic setup. Anyways, couldn't help myself... The plan at this point is to work on matching the Toshiba transistors and then if I haven't heard anything from Digikey by Wednesday, just go with the slightly higher tolerance capacitors and be done with it. I hope to get the parts by Saturday, if I play my cards correctly. I'm hoping you'll have your kits by sometime next week.

if those are Holco resistors, they look mighty funky

and perhaps an anime themed SARS mask? Those are so cool!

nah, a few very strange items though.. I think more expensive than VCAPs per pF? Anyways, a few of these 2 items: Voltronics PTFE trimmers (Mouser 768-A1J8 for example) Soshin Mica

you need some nice big Rifa PHE caps that would color coordinate with your build

I think I hit an all time record for expensive caps. I paid around $3.63 per pF.

perverted coupling?

Tim: Which Stax amps / Earspeakers have you heard?

profitable?

don't forget to bolt down those heat sinks...

For my upcoming preamp:

I'd be interested to know if the certain someone who PMed me about the Muse decides to buy it... 'cause we'll basically have the same setup, give or take a few tweaks in the amp....

wow, those look awesome.... /me is looking for dealers nearby

I also got the cases today. Did I say it was going to be a tight fit? Basically, I think there is only a single good config. The toroid mounted against the front plate, and the 2 caps and bridges mounted to the bottom panel, right up against the front plate. Thus the PCBs will be moved to the back corner, away from the IEC inlet. It will be close, but it should fit. Remember that diodes emit RF and should be placed away from any input / output lines, and of course the same applies for AC lines. I really like these cases for the money. They look kinda crappy, until you get them assembled... then they are nice and sturdy. With a nice front panel made from wood, I think they'll be very nice. Also, it's about a small as you can get this project, in terms of case volume... trust me

interestingly enough, the subsonic filter was only added on the Xono and was not present in the Ono... also, both are capacitor coupled.

ooh there's another Muse Model 9 signature for sale: AudiogoN ForSale: Muse Model 9 I've had mine for almost a year now? Definitely more "digital" sounding than my Museatex, but I really like it on the 24/96 HDAD discs, for example.

so, when are you going to make an external adjustable bias supply

lol

Last night I got all the resistors and such sorted into kits. I also received the Russian teflon bypasses and had a chance to try them out on some other projects and I am very impressed. I don't think they will disappoint. No updates from Digikey, they're still trying to get a ship date from Panasonic. I have a bit of soldering to do for a couple people, and then I'll start in on the JFET matching this weekend. Once I get the JFETs matched and the cases arrive, I'll probably just break down and go with the lower tolerance part from Digikey so we can get the parts shipped and the show on the road.

don't forget to ask John for a suitable power cable upgrade :)