spritzer

The cost of a 845 based amp would be horrific and it would dwarf any headphone amp ever made. The amp it self is relatively easy to design and build but the power supply is a huge headache. A simpler amp could be built but I just don't get the point of a compromised design around a world class tube. A 572-10 might be a better tube choice but they aren't produced any more.

Mine are so far from stock as I used them to test different diaphragms but they do sound ok for what they are but I would never pay more then what a SR-5 is going for these days.

Do I have to come over to your houses and beat you over the head??? .... A 350w amp only gives out that much into 8ohm at full output. It gives out much less with a lower input level i.e. at a lower volume. Most amps are running at about 1-10w most of the time. The extra power is more in the form of extra current with the voltage being so low and the SRD-7 needs voltage and a bit of current.

The 6s4 is a good choice especially since I have a nice stash of them. That is one toasty amp. I was considering a 845 driving a 845 in a Stax amp so that would be 8*35w just for the heaters... There is a design already out there in the second edition of Morgan Jones's book. It was conceived for loudspeakers but will push the SR-007 really nicely but he says in the book that it is the scariest amp he's ever built and none of his measuring equipment worked with it. 1200v can do that. I'd like something simpler like a push-pull SET and use a push-pull choke instead on the output transformer like Jones did. An amp like this should also work just fine on the Quad ESL.

It can only take about 10w before the internal resistors self destruct. The older phones with unprotected stators and maximum voltage of 400v will be goners but the new ones should be able to handle it. The Senns would have gone up in smoke a while back.

300$ is a bit on the high side... Maybe I should sell mine... Micro Seiki made their own phones and even made an OEM version for Infinity. They are pretty different from almost any other phone I've seen but they can be a bitch to get working again as they all need new diaphragms.

The HE90 is almost a third heavier but they are also quite a bit bigger. The main problem with them is that they won't have enough range on the headband so I can't make it big enough while the He60 fits like a glove. Can it withstand 350w of power...no but it can be used with any amplifier though the extra power will only sound worse.

It mostly boils down to the fact that the HE60 doesn't annoy me as much as the He90. Less diffused and with better bass and a believable soundstage. The HE90 is smoother and more rounded but I'd still go for the HE60 every time as they fit my head better.

What output tubes are you designing it for? The BH is pretty complicated but it is good as a space heater when it gets cold up here in Iceland...

Transformers= more dynamic sound Amps= more detail It's not really that cut and dry but that would be a good baseline

Depend really on what you are looking for as it is a toss up between the extra dynamic sound or the intimacy and detail retrieval of an OTL amp. I prefer the amps but you could get a used T1 cheap so that might be the better choice.

Lets all just forget out that. There were different speakers in the pilot. I was pretty angry when the second episode was show and thery had swapped out the speakers for something small. Btw. This weeks episode was simply brilliant.

That's part of the cable assembly and the only description I've ever hear is that the contact pins are crimped onto the cable. There could be some solder underneath as that's how Stax normally prepares the cables.

He has Duvelle omnis in the apartment and Thor Audio electronics though they were stolen in one episode. You should really find the original pilot as the speakers in the office were different, Audiostatic electrostatic speakers. Really tall but slim speakers.

I sent a message but haven't heard back. No matter really as I'd really like to start out with a 230v unit and they can be had cheap in Asia. If I find a APL 3910 I'll have that upgraded to full 32bit spec and spend the rest on speakers and all my amp projects. Well I hate to admit it but even I am selling a bit off the collection. :'(

Yay. That is a great show and Hanks hi-fi was pretty good, Avid TT, some krell gear... I read an interview with the shows creator and he was shocked by how much the show was liked in Europe and that it didn't need to be on any restricted channels. Heck it's at 9pm on Sunday nights up here

It's not that much so 5w should be plenty. Dumping huge amounts of power into a SRD-7 is a moot point as speaker amps deliver much more current while the voltage stays pretty much the same and stats need voltage. Way to go preaching the gospel

There is no solder in the O2's AFAIK. Lead free solder is fine but you just have to know how to use it...

That few huh... damn stop planting ideas in my head... I'll drop the seller a line and see what happens. Now I've got to get some sleep.

Backups on a separate drive structure are for wusses...

Ehhhhhhhhhhhhhh.... He's had it for awhile but never used it. I'm so happy that there are people just as crazy as me out in the world The parts could be better but I'd like to sample it and see if building my own, the way I like it is something worth pursuing. While the amp is similar to the HEV90 it is by no means the same so all comparisons are moot. A fully upgraded unit will not be cheap though as the amp parts are 2.5-3.5k$ easily and then there is the question about a new PSU... It could be very nice with a simple unregulated, tube rectified supply filled with vintage NOS PIO caps. I'm searching for a UX-1.... I almost jumped on the black one on Audiogon this morning but I'd really prefer a silver one. Must have something to do with seeing a glacier many times a day...

The sad part is the most designers have lost that drive towards more accurate systems and have instead landed on some strange plateau of manufactured hi-end sound. This is why this there are all these small niche markets to satisfy the true music lovers that don't buy into the high-end crap. I can listen to music on just about anything but I have my rigs to get closer to the music, not to paint a pretty picture of how it should be.

He does have two Aristaeus amps... I might buy one of them though, just for kicks. My He90 is ohh so lonely... :'(

There was no lead in the Mk1 but the finish was made using some chemicals that aren't allowed under the ROHS mandate. They only needed to change that but they also fixed the few issues that had surfaced in the 9 year production run and most of those were tied to the earpads.

I would certainly try some other cables as well as try to remove all power filters and such. Silver rocks! Yup