spritzer

The last normal bias amps were made in August/September 2003 but the only change was to just replace the 6 pin socket with another 5 pin. This worked great on the 313 with only one Pro socket to begin with but the 006t and 007t were a bit silly. The 300 and 717 were never equipped with normal bias sockets since they were later additions.

We aren't really the normal Stax customers but many of us have a SRM-717 which is the best amp Stax has made in quite a while. The others aren't bad, just underwhelming.

There are also heatsinks which don't have any pins for screw mounting. I must say that I prefer the pins since it's never been a problem to remove sinks fitted with them.

Glad you like them Andy. The bass can even be a bit overwhelming at times but that's not surprising given the size of the drivers.

Well the bass out of the 007t sucks and if the fit of the headphone is off then it only makes matters worse. The bass on the SR-Omega is more rounded as it lacks the control and precision of the Mk1. This is a housing issue which is also somewhat present on my SR-Omega/007 hybrid. The soundstage is wider but the imaging is also more vague. It's not HE90 "I'm lost in fog" blurry but just a tad "off" compared to the Mk1. Again this is tied to the enclosure so this is transferred over to my hybrid. They also lack some of the depth that the Mk1 can pull off so the stage is flatter.

They are a little bit easier to drive but also present their own challenges since the top end can be a bit OTT on some recordings, similar to the He90.

I'll see if I have the parts and let you know.

Happy birthday!!

Have either of you looked inside the housings to see of the wires are too close together? I even fed mine some 700v+ of bias and they didn't complain. Was that aimed at me...? I'm going to make an adapter for use at CJ (people have to hear a normal bias Sigma off the BHSE ) so I can check if I have enough parts for two of them....

I'm sorry for your loss Ken and I'll raise a glass in his honor.

Does anybody want to sacrifice a Koss amp? The front panel has to be taken off to get inside the unit but it would be great to see the bias supply.

I bid on that one. I've been bidding on almost every Stax auction lately but I'm cheap... If the drivers were replaced then they put in SR-202 drivers. Man I'd love to rummage through the discarded partsbin at Stax... \ It's been a while but they are certainly similar.

"In Soviet Russia...."

A SR-X Mk3 Pro with new pads isn't that uncomfortable but the damn headband is unpadded so some decent amount of hair helps... The Basic models use a more simple driver and the old OFC cable while the Classic has the upgraded driver and the normal width PC-OCC cable with Signature using the Wide PC-OCC cable. The Lambda Spirit replaced the Lambda Pro and was the original Basic model. It was called Pro Classic here in the West and used a 1.5um diaphragm (don't know about the stators) but used the Gamma style arc to save costs.

A few SR-5NB's do show up in Japan but usually bundled with SRD-7Mk2's (in a neat plastic box) but they are very common in Germany. They do indeed use the SR-X Mk3 driver but that is in turn just the old SR-5 driver with a new diaphragm. The stock Alpha Excellent isn't a bad headphone by any means but the SR-X Pro is just moar better.

Ditto on the SR-Lambda and only the later SRM-1 Mk2 amps were Pro bias and they are all clearly marked Professional or P.P.

I don't really want to make an SR-X Pro but I keep getting PM's about them so the demand is there. It's damn hard to make them for less then 400$ these days, even with me working for free as usual... \

Your application has been received and is being processed. Since this was outsourced to SP, then it could take a while.

Ouch on the transmission line. The 4070 is heavy enough as it is... 180$ (1$=93Yen) plus the fees and shipping. That's too expensive for me to make a cost effective SR-X Mk3 Pro.

Those do look a lot like the SR-007 cases...

You know I will bug you about it. I need to finish a few ESP amps though before I can start to work on that.

Looks like I need some moar heatsinks soon...

You are correct but that's why the back of the 4070 housing is curved and angled, with ample damping and bass reflex built in. The 4070 is a beast to drive properly though and that's why Stax only recommended the 717 for the job. It is remarkably free of the usual box colorations with only a hint of thickness in the midrange. Oh crap, now I've started to think how a 4070 would sound with some damping and properly mounted drivers. Looks like I'll have to buy one again... I've placed a bit on that 404LE on Y!JP so the rest of you back off. Also, who put in that insane 17k+Yen bid on the Alpha Pro Excellent?

Holy crap!!! Has anybody ever tried using the F5 to drive a reactive load such as a Quad ESL?

Danm, that F5 in clearly needed.