kevin gilmore

At this rate there may be more of these than the originals... I'm starting to adjust the position of parts to make sure it is easy to build. The dynafet is much harder to stuff...

Board sets will be available seperately.

Whats funny is that in the late 1970's B&O produced speakers that needed at least 100 watts to drive properly, and those were the connectors on the end of a 16 gauge cable.

The MLB is giving away these cards at the local jewel (grocery store) this is at 20x http://gilmore.chem.northwestern.edu/bob1.jpg notice the thing in the star... this is at 250x http://gilmore.chem.northwestern.edu/bob6.jpg printed holograms... The second hologram is .007mm in diameter

The biggest thing is to make sure you don't over voltage any of the resistors. There are parts of the circuit that have 4 resistors in series to make sure you can handle killovolt swings. The original used a lot of surface mount resistors that could handle only 250 volts each. If you use the standard rn60's they are good for more than 450 volts each.

This is why i'm doing just the pieces for which there will be no argument. Although the jury is still out on powder coating vs hard anodizing. or having my friend that owns an audi approved (aluminum) body shop put a few layers of paint on it. That is how wilson audio gets those kind of finishes... Spies Hecker black is one of my all times favorites.

That is how it is wired. Just checked the real circuit board pictures to make sure. Figure on about $4k in parts total including an RK50. If you are creative, you might be able to save a couple hundred in parts.

yup. That was back when those 2sc3381's were about 50 cents each. unless you know the right place to buy them from, go and check the bdent pricing. Way stupid.

I was joking. We have seen some of the magic cables produced by some of the whacked out cable manufacturers. One of which fills their cable with conductive crap. With 800 volts inside the cable, stuff like this is probably not a good idea. Neither is accidentally wiring the cable wrong and getting one of the high voltage lines switched with a low voltage line. Instant and very serious kaboom. You think these people are actually going to test their cables ?? Are they going to get a real cable to copy from... The filament lines are different sized wires from the high voltage lines. Will they know. Would they even care?

icarium x 2 sets of heatsinks.

Actually not. You can switch to the military amphenol connectors. You can order them with a proprietary rotary angle offset. (i think you have to buy only 25 sets). Then no one will be able to buy the connectors, and then they can't make stupid ass cables. In any case, use an aftermarket cable and void the warranty.

current board layouts http://gilmore.chem.northwestern.edu/staxt2connexonlyrev0-4-1.jpg http://gilmore.chem.northwestern.edu/staxt2rev0power-6-1.jpg I almost forgot.... 4 ounce solid .9999 fine platinum knobs will be available special order. Figure about $11K for the knob. Solid gold knobs (24k) will also be available. Figure about $5k. Solid silver knobs (.925) , not coated, and guaranteed to look really cool in a year or two will be about $400

OK so here is the deal so far. I've ordered all the components including the heatsinks. I'm going to wait till everything is in stock, and a couple more people have checked the design against the schematic. If you think you are up to that, give me a PM and i'll point you to all the pieces. The 4 heatsinks are going to cost roughly $250 total (plus shipping) which includes the bare heatsink material, drilling and tapping, and powder coating black. I've purchased enough material for 20 amplifiers. 5 are spoken for already (2 x gilmore, 2 x spritzer, 1 x icarium) if you are interested, let me know. I'm upfronting the money, so i don't want any payments now. The 4 angle aluminum pieces (completely machined) drilled will likely be $20 each. (you will need 4) Its mostly labor. For stuff like this, i will pay to use the milling machine. Working on the prices for the back, front and tops and bottoms now. The circuit boards are going to be $267 for the board set (one of each) if i buy 10 sets. Less if i buy 20 or 25 sets. So i need a show of hands as to how many want board sets. The board is layed out for either an RK50 (me of course) or the DACT. If a khozmo ever shows up, i'll see if i can add that too. There will be an additional small mounting bracket to secure the pot to the amp board. (this will be a few bucks max) All prices approximate plus shipping. I'm not going to make any money on this, but i don't want to loose any money either. So likely about $1100 total for all the chassis pieces plus a circuit board set. The 3 transformers from SumR are a total of $250. The rest of the parts including real amphenol military connectors about $1500. The RK50 you can price for yourself. Expect to pay $1k, maybe more. Not sure of the price on the DACT. amp board schematic http://gilmore.chem.northwestern.edu/t2schem.pdf amp power supply schematic http://gilmore.chem.northwestern.edu/t2schempower.pdf current board layout in a few minutes.

What you really want is solid marble pillars (the real stuff not synthetic)

Actually if you set the pots pretty close before you solder them in, and you don't have any shorts and everything is in the right place, it powers up just fine the first time.

Yep once you turn 40 you are toast. They used to make tv alignment tools which had a recessed blade inside a plastic tube. Put it over the pot and it stays in place. various politically incorrect name for those tools.

Actually someone is pressuring me to come up with a new otl amp. Its going to be called the Rock Lobster.

Could be, i ran it off bench supplies. The idea for this thing, and stuff like it is to get rid of the nasty output cap. You can do pretty much exactly the same thing for a singlepower extreme. And with all OTL direct coupled tube amps, you absolutely have to have output short circuit protection. Most people consider 6as7's to be expensive fuses.

If you completely recondition it, including belt and brake shoes its a very nice although quirky machine. Servo drives the capstain. First 30 seconds it usually wow's and flutters like crazy. Also sticktion in the tapes themselves will throw off the servo. Wonderful machine. Some even have the dolby-b option. Don't even bother trying to get recorded tapes, 99% are trash. Use for live 2 channel recording. B700 is a much better machine.

mostly due to layout. BHSE has 2 heatsinks 12 inches long. plus heatsinks inside the power supply. T2 amplifier has 2 heatsinks same height 17 inches long. T2 power supply has 2 heatsinks same height 17 inches long. (it really does not need this much, but it will look better when sitting under the amplifier.)

teflon sockets only it is. Actually looks a bit better this way. Anyone that can build a dynahi can build this. If you stuff all the parts in the right place and can do a really good job of soldering it should be a snap. http://gilmore.chem.northwestern.edu/staxt2connexonlyrev0-2.bmp ground plane removed for picture otherwise it wipes everything away, components that don't look like they have a lead connected are connected to ground http://gilmore.chem.northwestern.edu/staxt2rev0power-6.bmp i even have a bill of materials. (first time ever) so i have a clue how much its gonna cost, and how many more parts to buy. 231 semiconductors makes this the most complicated headphone amp ever.

Things are coming along, current board has layout for standard (i.e. cheap) and the teflon sockets, i'm thinking of going with the teflon sockets only. Any opinions on this... Definitely going to be less than $2000 in parts not including chassis. even with the teflon sockets and the SumR transformers.

Spritzers bakery is 175 years old this weekend. Time to make the donuts.

power supply coming along. http://gilmore.chem.northwestern.edu/staxt2rev0power-2.bmp Need +/-12 and high voltage delay circuit. have the one of the supplies on the bench for testing, works great. Initial quote for the transformers is 3.7 OD, 1.8 High. Plenty of room in the box for 3 of them.

And its mirror cousin. Fixed those two... thanks.. the npn on the power schematic is actually a 2sc3340 and the reference will be a ref102 because its less than half the price for the same thing.