spritzer

That would be great. The ED-1 opens up just like the SRM-1/Mk2 by removing the 3 upper screws on each side of the chassis. If you're up for it, removing the bottom would be even better as Stax normally puts the resistors there.

Could you open up the ED-1 and post some pics of the innards for us? We've been looking for the schematic but haven't been able to find it so it would be cool to see what Stax was doing.

That could come in handy if the next version of the BHSE needs to be liquid cooled...

The phones are simply bad running from something like the 007t though the familiar traits do shine on through the blandness. Screw the Sigma Pro's and go for a SR-Sigma 404. If I manage to find a cheap Sigma and SR-303/404 I'll build one and send it on tour of the US.

Most of the Omega owners upgraded to the superior SR-007 or he could have snagged some NOS amp after 1998.

Ouch!!! I'm glad that I can hold off... The one in Italy was 10k

Having a dual purpose board shouldn't be that hard with an angle bracket or a second set of traces. Good point. I don't see why they are built like that as I've yet to come across a stat which doesn't have a removable baffle of some sorts.

That case would work well and at that price it's tough to beat.

The chassis is a bit of a pain so that might be left out but a common FPE design for the front panel might be a good idea to fit some chassis. The 2SK389 are a problem but can be substituted with MAT02's but the 2SA1968's a problem.

It was a Sigma that started my madness... The KGSS can be scaled up and down some what so a group buy of PCB's, parts, chassis and transformers might be a good idea. I sure would love to build a small one to use as a desktop amp.

...or starts off with the O2+BH and then buys every headphone Stax has ever touched. Not that I'm recommending that path...

This was bound to happen sooner or later. Somebody is using my pictures on ebay... Ditto though the SRM-1/Mk2 is the best Stax amp bargain you'll ever find. The later versions are better and if a P.P. shows up, jump on it. Glad to hear that you like them. It may be time to buy one now and use that black PC-OCC cable I've been saving for just that... Can you post some detailed pics of the back of the earcups to show how the cable attaches to the drivers? I'm sure Alex could recable one for you...

Though it will be more expensive it should be good value. Woo don't just jack up the price like some other manufacturers do to make the amps look more high-end then they really are.

Thanks for clearing that up. I do hope they come up with something new, hell I'll settle for another take on the SRX circuit but built to the standard of the rest of the Woo gear. Now if they were to use something new like GU50's for output duty I'd buy one on the spot.

It will be fun to see what they come up with. I hope they use some cheaper tubes and at least direct couple some of the stages. If it's just a GES with a differential input as has often been talked about then that will only mean more ECC83's (rather expensive for the good stuff) and even more caps in the signal path.

I've been blamed for far worse things then this so bring it on.

Ok, good point. You shouldn't let the music suffer though...

That could be the reason as the amp might be drawing too much power. I hope that Kevin will chime in and help as I have a lot of 0A2's and 6SA's that will be perfect for this amp.

A good example can be had from Japan for less then 1200$ with the current Y!JP going rate as a reference. The SRD-7 will still show you just how good the SR-007 is and I'll try to find some cheap transformers which can drive the SR-007. The old albums sound great so go out and buy the whole catalog and relive the glory days...

There is nothing to hate my friend... just sell one of those K1000 and buy a used SR-007. C'mon you know you want to... be like us, be like us, be like us.... Btw. There is absolutely nothing wrong with the DoD DVD-A. It was just set for 5.1 in some hidden menu and now it's fucking brilliant!!!!

Make sure that he's using enough heater supplies and then swap in some NE-2's or 0A2's to test. Also what PSU is being used?

Congrats!!! Stax sure can rock and it gets even better with the BH. I'm listening to the Dance of Death DVD-A and the sound is amazing but the mastering is slightly "off".

Sky's the limit here with electrostatic transformers from Sowter running at about 500$ for the pair but I'd really like to try the cheapest Hammond output transformer (less then 50$ each) and wire it up backwards to see how it behaves. There is always the Illusion unit but it's rather expensive and no thorough comparisons have been posted. All the T1 amps share the same amp circuit (exact same PCB) but all the extra circuitry in the T1S and T1W does exact a small toll on the sound but it's nothing to worry about as different tube types matter a whole lot more. First of all, electrostatic elements act as capacitors so all rules for dynamics (resistive elements) go out of the window. Since they are big capacitors the impedance plot is like a ragged bell curve with the HF and LF tougher loads then the midrange. All electrostatics need voltage swing to make any sound but as the impedance drops in the treble and bass the elements draw more current to maintain the voltage swing. It's not a whole lot of current but at 300VAC it really adds up and most amps simply can't deliver it making the bass seem boomy and the treble rolled off and dark.

The watt rating of the SRD-7 is utterly meaningless here. We are dealing with voltage swing and when that doesn't cut it, current delivery. The simple fact of the matter is that the SRD-7's were never designed to deal with the load presented by any one of the Omega series so while they can provide the necessary voltage swing, the current is lacking due to the small transformers. The newer model is more compatible with lesser drivers but it's no night and day difference. They are basically more "impressive" in those areas which the Mk1 was lacking with lesser amplification so they seem better.

I don't recommend the SRD-7's for use with the SR-007 as the transformers simply can't deliver enough juice for the phones so they will sound a bit dark and rolled off in the treble with a rather woolly bass response.