spritzer

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.

Be very careful when removing the Stax socket as the break like an egg. I ripped apart the adapter for my ECR-400 and they are indeed single ended or uni-pole electrets though the drivers are dipoles. When I wire up uni-poles I configure them just as a normal Stax headphone with the + side next to the ear and - to the back. This could be causing some issues but I think the air gap is much larger on the Sony then what the Stax boxes can deliver for. According to the service manual the left pins are the two who make a vertical axis while the right side is horizontal. Polarity doesn't really matter.

YGPM

It's the only reason that I'm a contributor on HF although having a search function that works can be nice as well. Desoldering a resistor isn't that hard but don't do it you don't feel comfortable. If Deepak doesn't want the amp then I'll take it off your hands.

All has been quiet on the western front but I'm just waiting for the onslaught. It will come... it always has when Stax fever hits the boards. I'll probably be selling some more of my gear soon and I'm really not looking forward to that. \