spritzer

Didn't the Exemplar use 6dj8's or some of the variants?

Happy Birthday!!!

I'm sure they were made in the far east but the ones I was referring to are the companies that offer ultra cheap boards.

The odds of a Stax headphone breaking down are rather slim and if something were to break I'd send it to Japan rather then have Yama's butcher it. I've seen their handy work and it wasn't pretty. Might be a couple of isolated incidents but Stax in Japan does top notch repair work.

Hell no!! I'm going to track down and buy the unit rumored to be here in Iceland though. Having them made in China wasn't going to be much cheaper and the quality can be pretty shitty. Fine for prototyping though.

The Stax transformers are around 1:25 so they step down the impedance 625 times. Lower ratios are certainly possible and the Lundahl LL1630/PP would do the trick.

If you are just going to use the Beta to drive the phones then you have no need for the transformers in the SRD boxes and can just leave them out. How the B22 will behave into the load is something I'm not sure about. The transformers step up the voltage but also step down the impedance which the amps "see". We are talking 100K+... \

Some extra sockets would be a good idea since with the transformer you'd have to recase it and Stax sure loved to epoxy them in except on the most recent boxes.

Then it should work well.

That one would work if it is linear, not log. Freaking huge though...

Good to know since I have quite a few transformers to order...

A built in voltmeter would never work, the input impedance is too low. I really don't think that a pot would work in the shunt position, the more I think about it. If it were say a 5M pot and adjusted way down then that would be just asking for trouble. Putting a resistor in series would kill off most of the adjust ability while making sure the supply worked as it should. Now if you could find a 10M pot for the series position then that should work and give an adjustment range from 600V and down to less then 200.

4 hours maybe with all parts precut and bent into the correct shape.

To pick this up from the PM's, there are some issues with having a variable bias since depending on how it is implemented, it could put too much load on the voltage multiplier and thus pull down the voltage. There are two options here, put a pot on the series or shunt positions. The series has to be rather large in value to go all the way down to 100V or so and I don't think I've ever seen a 10M pot that is any good. The shunt can be smaller but if that is adjusted all the way down then the bias voltages could sag. The is also the issue of having a meter good enough to be able to get an accurate reading off the bias supply. Standard meters will not work though the VC99 talked about in the Fluke 179 thread seems to work ok and it is quite cheap.

Beyond cool!!!

Me thinks Dinny should just drop all his current dacses and buy something really expensive. ML 30.6 or Krell 64 springs to mind... Ohh and the Sony R1 is so good it is quite silly that CD was ever labeled as a "bad" format. Listen to the Meridian G08 next to it and it all becomes abundantly clear...

Moar Black Gates FTW!!

The 717 is a fine amp but the KGSS is better, more control, detail and simply gets that moar out of the way.

Happy Birthday!!!!

Yup and the rest are just idiots such as Sovshiller etc.

Happy Birthday!!

I was thinking about adding a Hammond 229A230 to the input of the bias board just too be sure. I've done some thinking on this and you might need more bias (if the volume from the B22 isn't loud enough) then the PCB can give you in the stock configuration. I might be able to fit 400V+ caps in there which means 1000V+ output which could then be cut down at will. Btw. Kevin you have an email on a similar note...

Almost blew up my BH. One of the indicator leds on the front panel was off so I was checking for a broken wire with a pair of pliers when I dropped the pliers and the metal jaws landed at the bottom of one of the tube sockets... It didn't short out though but damn I shouldn't be working on my amps with no sleep and after working for 12 hours.

If you like MOAR BASSESS then it's ok to remove it but I like it in place as well. I must be getting crazy though but the best Lambda I ever had was one made from Sigma leftovers and thus with no damping. It did have the dreaded foam though...

Happy birthday!!