spritzer

That looks ok and the tube sockets are the CMC teflon units (or the ceramic ones would probably work) and the terminal blocks are just the standard 0.2" pitch. Here is how far mine has gone. Almost took off my hand with that bloody drillpress so this is on hold while I make a few KGSSHV's.

No issues here except them always being perfect. That might annoy some people...

The 350mm Modushop Slim boxes will work just fine. Maybe even a bit too big but we'll know next week when I'll fit the boards into one of those.

Could very well be that I've got it backwards as dynamics really aren't "my thing". The opposite is certainly true for electrostatics but then again we are worlds apart there in almost every aspect of transducer behavior. The damping factor would actually be higher since the impedance is often quite a bit higher than 300R according to the Headroom graph. Edit: Won't allow me to attach pnp's so here is the link: http://graphs.headphone.com/graphCompare.php?graphType=7&graphID[]=2321&scale=5 Very odd curve to say the least...

It's a transformer based input so the amp doesn't care if it is XLR or RCA input. Just use a normal XLR-RCA adapter and it will work just fine.

Output impedance=damping factor so yeah, it is a huge factor. With speakers and their often highly complicated crossovers it can be less of an issue but it indeed often overlooked.

Does anybody want to see what serial testing of KGSSHV boards looks like? That's the pile of fail from Hennyo all tested and working plus the new HVk (k for kompakt) boards verified working. I still have to test the servo but I forgot to order the caps... The new input fet didn't work for me but it was probably my soldering. It's tiny... to say the least.

Something being unsoldered is just lucky. I haven't looked at mine for months now, plenty of other headaches to deal with...

Nope, after changing all the sand more than once the problem still remains. The only plausible explanation for this behavior has to be the K216 on top of the batteries and I was waiting on some old K216's because the recent units may not work as it should. It is a long shot but everything tests ok. After this I'm out of ideas and I'll have to take a trip to Chicago with the amp and bake Kevin a huge cake while he takes a look at it for me... Did something happen to your amp or did it power up like that for the first time? Mine did work and then the main CCS shorted to the chassis and it started to have problems.

I was supposed to get one in February but last I heard nothing had arrived. It's been confirmed by Sennheiser that the output impedance is 43ohm but they are very tight lipped on the circuit inside. One of the R&D guys was here in the spring as said the window on top was for people like me, to save me the trouble of opening it up.

I think that rig is the old 57 setup from the old Huntington factory as it was all shipped to Germany when the production was moved. The panel on it is a ESL63 but the setup is the same as for the 57 with that flat oven at the end of the track to heat set the mylar.

I bet you can use Comcast to access a place where it is available on demand...

Pixie dust is as good an explanation as anything else but I think there are two reasons for this, how the ring radiator behaves and that this is Sennheiser. The ring radiator has some pretty interesting properties and is clearly undamped in the HD800 so it must need some electrical damping to make it behave and become more linear. I haven't looked into speaker designs using these but they might be doing something similar there. They are certainly known for their high HF response so some compensation might be needed to keep them inline. As for the latter lets bring up the HE60 and HE90. The drivers in both are kissing cousins aside from the materials used. Same basic principles, conductive paint on non conductive stators and the same diaphragm material. Assembly is also very similar though the poly-whatever Senn used on the HE60 meant it could all be integrated into 4 pieces. Anybody who has listened to these cousins knows how vastly different they sound and more importantly, just how different their amp requirements are. The HE60 needs power and low output impedance but the HE90 doesn't. In fact if sounds more placed with higher output impedance. Transducer size is a factor here as electrostatics are more efficient the larger they are but Sennheiser clearly tampered with the way the drivers behave. The HD600/650 is a similar case but here the drivers are the same, the baffle is different. While low output impedance is a good thing there are exceptions that prove the rule. What I need is a two to 4 gang linear 100R pot to test on the fly but these are not easy to find.

Not the first one to have the bridge issue. It's fixed on the new boards...

Do you have a GS-X or something similar there Tyll? It's an interesting comparison with the L-2 once you match up the output impedance.

That TOCO's just looks like a cheap ceramic pot so color me skeptical. That's what Craig says, he even says only stupid people who don't know what they are doing use 4 gang's...

Fully vented top and bottom is not a bad idea. Not needed here because we never get above 20°C... ever.

Ahhh PRP's, where the reject pile almost equals the useable units. That's why I use CMF60's instead.

Probably on demand... well sort of...

It is quite good isn't it...

I thought I recognized that one. but had to scratch my head quite a bit..

If we were ever to think about how much money we pour into this stuff then we'd be sure to take up substance abuse... as it is much cheaper.

Hmmm ESP950 is out of stock... crap.....

Yeah... that is overkill gone wrong.

Fake it till you make it is my line...