spritzer

Very cool!! That reminds me I've been neglecting my SR-007A in favor of the 40$ Koss ortho I made... \ Then there is the large Stax shipment that should arrive tonight so there is even less time for the SR-007A.

I got it really cheap which was my major requirement and I never buy Intel if I have a choice.

I just bought and installed some new PC stuff: AMD Athlon 6000+ Dualcore processor 4GB of DDR2 ram Gigabyte motherboard Geforce 9600GT 512MB It's a huge upgrade over my old rig and playing Crysis in medium settings and 1680x1050 is something else.

The phones hold the original bias for a good few minutes so that is certainly possible. I did try something similar to that by using an SRD-7 mk2 to charge some of the phones in storage but I never pursued it further then limited testing. I was going to have a special storage cupboard built and that would include bias supplies to keep the phones always ready but it never materialized. I do think it's a good idea to let the phones rest so while I'll have a air tight cupboard built it will contain amps to warm up the phones I want to use and not bias supples.

Believe in the transformers!!

Happy birthday!!!

You can find them here. I also looked through the PCX site and Hammond 1608 output trafo should do quite nicely and gives a nice range of stepup ratios.

The Just real music trafos would be an unseen recommendation but just about any 5000:8ohm output transformer with a CT primary will do the job just fine. The circuit can be made to be really tiny so it shouldn't be a problem. There were two versions of the SB design, one with extra transformer and one without but I've seen the service manual for the Mk2 SB model and it uses an identical bias supply to the AC powered unit.

I'm up for a trip to Japan...

An normal bias SRD-7 with a DIY SRD-7 Mk2 bias supply installed. That's a late production A model.

It's an upgrade, that's for sure but how much really depends on what version of the SRM-1 you've got as the difference between an early A model and a late C model is substantial. It's been too long since I've had a 717 here but it's a great amp but the KGSS is even better...

Sk

They are driven as uni-polars but are really just normal, push-pull drivers with two stators on either side of the pentagonal electret film. The schematic for the adapter shows just a simple input to the transformer and output again. I just noticed that Sony had included the impedance specs for the transformers 3?:4100? which works out to a step up ratio of 1:36.97 The other uni-polars I've owned had a single stator and a metal backing plate connected to ground. That's what Phillips uses at least.

We'd probably wait until they are 10-11. If they don't like beer there is always Brenniv

Just give everybody a beer... or two... or twelve...

It could very well be that the Stax boxes were starving them of power which would account for the anomalies at the HF and LF.

True but cheap it is not. The Icelandic krona has taken a dive though so it's cheaper to visit us then in many, many years before.

Good point. We could always have a meet here in Iceland. Those that have been in downtown Reykjavik at 6am on a Sunday morning know what I'm talking about...

Justin increased the price some time ago and the amps are in high demand so it should be a fair price. There is a new version of the amp coming but only Justin knows when that is.

I don't think I ever tried my 400's before shipping the transformers to Headamp... \ I did try them from a SRM-1 amp and not counting the channel imbalance I don't remember any power issues. I need to hook them up again...

There are two if I'm not mistaken. One is SE only and with Black Gates while the other is stock.

When you look into the plug with the pins like this: 0 0 0 0 0 0 The top pin is left + and the left most pin in the middle row is right +. The bias for the left earpiece is in the middle of the middle row with the left - pin to the far right of that row. The bottom row is the right earpiece bias on the left and the right - on the right. There are pictures in my gallery here but a written explanation is always better.

Comparing stuff while wasted would add another dimension to the impressions and people would be much more open.