Pars

I think he said HE was going to build it, not John...

Something wrong with Ideal T-strippers? Mine are 30+ years old and still work just fine, including teflon, which is pretty much all I use.

Being a glutton for punishment (and since I was messing with my dynahi anyhow), I decided to take another look at this. Nothing yet, other than a few observations: I built an LTSpice model for this (attached, change extension to .zip), which seems to work. I think I found good enough models for devices. In DC testing, some of the BJTs in the DB sections are running rather hot (55C). Q19/Q22 and Q23/Q26. Bias for 4 output devices is ~80mA per device. Current configuration of the Vbe multiplier is 2.2K for R17/R18, 1K for R62 (not on Eagle schematic but in series with TR3), and TR3 = 20K. Adjustment range of ~88mV or so low to > 150mV. Current source resistors are 1 ohm but probably going back to 2 ohm. I currently have 1K gate stoppers in, but have not tried running signal thru yet to look for oscillation. Eagle files as I have them are available on request. Not completely correct, but close to board. I'd like to have this thread moved to the diy section, unless someone objects. Hard to find here. Dynafet ltspice.doc DynaFET_schematic.pdf

Happy Birthday Jeff! Sent from my iPhone using Tapatalk

Bringing this thread back. Was playing with my dynahi/s22 combo this weekend and put larger sinks on the s22 as things were approaching 70C. Started measuring stuff and loaded with a pair of dynahi boards set at 75ma the transformer is putting out 37Vac. SumR 120VA, 2 x 30. Regulation seems to be kind of poor even though it is lightly loaded. Sent from my iPhone using Tapatalk

Or refuses to go like Bennett. Fat chance though. And it was a really good game, and was the only one in our family rooting for the Pats. I would have been fine either way though. Almost quit watching in the 3rd when it was looking like a blowout. Sent from my iPhone using Tapatalk

This is what I have used for several years. I think the DA10 is the insert that I have. Focal distance is a bit close at 4". http://www.doneganoptical.com/products/optivisor

Very nice!

Have fun in NYC all! And avoid the red vodka Sent from my iPhone using Tapatalk

Sent a pm to one of the mods over there regarding this (didn't know which "jude" was jude.) Banning imminent I suspect Also, I assumed that no one ever asked one of the Fla. crew for their permission to use the name? Sorry, this has bothered me for quite some time (1st world problems, I know...)

Commercial trade show should pay Fla. crew for the use of the name Retroactively. Sent from my iPhone using Tapatalk

You could do Colin Toole's I/V stage... he may even have some boards left (you would need 2 if you intended balanced). I built up a balanced set and used them in the Adcom CD player that recstar24 had. You could ask him what he thought of them? http://www.head-fi.org/t/316795/discrete-i-v-converter-board

luvdunhill might match these for you, but you would need to contact him. He has a curve tracer (locky_z), and likes doing this kind of stuff. I'd ask his opinion on how many devices you might need to get a good match for 4 quads. I could probably do the board layout for you and integrate the es9018 stuff if you wanted that on board.

Re: 2SK369V This guy on diyaudio has them, but is in W. Australia with large shipping costs. Genuine devices though. You need 4 quads matched (16 devices)? You would probably need to buy 100 devices to guarantee this level of matching (and nothing is guaranteed). Might get lucky with 50... http://www.diyaudio.com/forums/vendors-bazaar/297423-toshiba-2sk170-2sj74-fets-other-semis-sale.html I had some stuff I needed and would consider piggybacking an order to split shipping if you decided to go this route.

^ Agreed Reks. I wish I could understand him better though Sent from my iPhone using Tapatalk

Same. Haven't checked them but they look fine! Thanks! Sent from my iPhone using Tapatalk

Damn straight Sent from my iPhone using Tapatalk

AOT is a resistor (R62) spot in parallel with R54 (10K), feeding the sense line on U3 (TPS7A3301RGWR?) to ground. Maybe used to tune V- to match V+? No value listed in the BOM for it.

I am by no means an expert on this, but I thought thermistors went in the primary wiring? Nelson Pass seems to use CL60s a lot, wired in the primary. 527-CL60 He may have changed, but this is what I remember. Hopefully some of the larger amp builders will chime in. This thread has some discussion of this.

Maybe some of these Amp receptacles? For 0.0252" pins 649-75915-304LF That one is a 4 position. Are you trying to find a connector type to connect the buffers to the ubal->bal boards? I actually think that Kevin should just put the buffers right on the ubal boards. They wouldn't add that much real estate, and if you didn't want to use them, you could just jumper them. The Phoenix connectors seem to add a bit of real estate on small boards such as these though

Paid. Thanks!

BL or GR? Sent from my iPhone using Tapatalk

Were you going to do the SMD Ubal board? That's the one I was interested in. Also, I assume the diamond buffer boards are single, so you would need 2 of these for each Ubal board? Thanks!

RIP Butch Trucks And RIP for Mary Tyler Moore Sent from my iPhone using Tapatalk

I would think that incorporating the diamond buffers for balanced would be the way to go. Do you have a schematic for this board as well? Broken record time... Any chance of including footprints for 0.1" Molex KK connectors as well? Good time to duck now Sent from my iPhone using Tapatalk