luvdunhill

Just paid for the Promitheus Audio TVC!

I thought I had already uploaded this .. oh well, I made some progress on Monday night:

250 2SJ74 JFETs (50 V grade, 200 BL grade) yum! edit: oh and 50 pairs of Hitachi 2SK216 / 2SJ79

buy a mini / desktop CNC mill.

"We design our equipment not to sound like anything...At Purity Audio, it's all about the sound". Therefore, Purity Audio is all about nothing?

what about driver compensation networks for open baffles?

yeah, this is what Sowter recommended I do with the second transformer for conversion. I think the key is to avoid Permalloy / mu-metal and thus allow higher voltages. I'm talking with 2 people about custom units from either grain oriented steel or a 50% Permalloy solution. They are saying that I can get maximum input voltage up to around 25 VAC this way. The other option would be an air-gapped core, but that will reduce inductance by a factor and make the unit less suitable for volume control. Now the question is how much DC these custom units can handle (since I'm moving away from Permalloy) and if I can use them to replace the coupling caps as well... stay tuned!

Same Morel midrange I'm using. Very nice, but definitely a "different sound".

Just wanted to add this informative link to the thread: ecp.cc

ha! (I think). Burn-in also counts as non-stock.

have you installed the connectors? I mean, I could be totally full of crap (fungi your check is in the mail, thanks for getting my back)...

stock IC and power cables?

your ears?

yes, but can you move the ring portion of the connector?

heh, I shouldn't have stopped you from trying them out... that wouldn't have been cool. I just don't think the build quality is any better than the usual suspects.

have you heard the LCR version? What's not to like? price? I'd sorta like to compare it to a good solid state design. (LCR transformers in general, not necessarily this design, but it would be a good start).

security doesn't seem to be its strong point. Expect exploits soon.

tooth fairy's

I've only used 4, but all of the rings loosened up after they were soldered. Perhaps someone has one on hand and can check. Just put your thumb on the ring and put your index finger on the tip and the middle finger on the sleeve. The try and push the ring through (in between your other fingers)... kinda hard to describe

hm.. so, I'm not getting an overwhelming response "go try this, no one has done it". It would definitely be the road less traveled. I have ruled out the Sowter attenuator transformers, as they cannot handle the signal without saturation. In fact, as aerius mentioned, any 100% mu-metal / permalloy solution will not work unless it's air gapped to support DC. So, as far as the "coupling capacitor" hating crowd, which is worse: 1.) an attenuating resistor + coupling capacitor on output 2.) a transformer

not that you really care about my $0.02, but that Furutech 1/4" is kinda crappy. The center ring portion of the connector sometimes get loose, which is very annoying. it does for me at least. And material where the conductors attach are pretty crappy as well.. thin and of some lame gold-plated material.

I'd like to see off-axis response

well, the 9v battery can be used in place of the zener diode to provide a voltage reference. I have no idea if there are benefits, some people posted at DiyAudio think so, some don't. I'd have to try both to really comment further though.

I've actually hacked apart a Zu cable, and the interesting thing about it is that it uses a very complex cable geometry. I messed around with it, and then recovered it and reterminated both ends. I expected the microphonics to reduce, but actually they didn't. I'm attributing this to the tight cable winding. Anyways, I'm under the impression that the only thing I'd pay extra for over and beyond UPOCC or silver these days is the more complex cable geometries.

yeah, the camera is great when I'm outside shooting pictures, but I seem to want to take pictures of DIY stuff either late at night or early in the morning, and at those times I'm confined to my small office with it's really crappy overhead lighting. I need to look into a flash at some point ...