spritzer

Lower plate resistors are a bad idea for electrostatics. 50-70K is the golden range.

I'd love to fax some over but I'm sure they are all sold now since we closed 15 minutes ago. It's since September but naturally it's far newer as it keeps leaching germs from the environment.

This is still work in progress and I have yet to optimize the circuit for the 6SN7 (supposed to use 12AU7's) so the values reflect that. I will never be able to run the tubes to the max give the constraints of the transformer I'm using. Running the tubes at 6mA is tempting (what I did with the B-10, max rating for the tubes) but the transformer can't sustain that so I'll probably run at 3-4mA to keep it nice and cool. I'm also not sure about the cathode bypass on the second stage as it's probably more trouble than it is worth. The amp is currently hovering around 50dB worth of gain which is enough for me with 7.2VRMS available from the source. It will be north of 1000V P-P but the distortion will be significant.

I went to work on a cold Sunday morning but I did remember to take a picture of my sourdough breads for Jacob: It is a 54 hour process to make these from preparing the starter, to making the dough, letting it slowly rise, forming them and letting them rise some more until they finally see the stone oven. These are a bit on the wild side as I'm still taming the mother dough after my main cooler died last week and everything got a bit too warm. I've been making these since September and it's been a lot of fun to get back to the basics. Knowing what you can do and what you really shouldn't do to make a stable product. It's a bit amazing what one can do with Flour, water, rye and some salt...

Stax SR-40 FTW!!!!

Any of those should work. No BOM as we never do one and we just need schematics for P-P amps. Speaking of something different, here is something I've been working on as an attempt to burn off some of my surplus parts: It's a reworking of the Stax "A" circuit with a diff input. Really needs feedback but not enough gain...

I have dozens of PS3 rips (not done be me) and even though they are the wrong sample rate they sound very nice indeed.

The large heatsinks are causing the amp to drift so much. If it drifts once it's up to temp then you have a problem. I would not recommend trying to use the chassis for grounding or rather as a conductor. Much better to just star ground everything in the PSU with wires.

Because we can?

Get a MSB, they really love to upsample.

It is a filtered IEC so it can buzz but the transformer is a more likely cause. Mine has been running on a 2AT fuse for close to a year now with zero issues. Nothing wrong with using the amp on a 3.15AT on 117VAC then.

The Dynalo and KSA-5 are similar is many ways but that is a very good thing in my book. I wouldn't try to use this for speakers though as the amp was never intended to do that. The PSU will not like it one bit too. Huge thanks to Tom for his help on this and the reasons for me buying a HD-800 should be clear now. It should be quite cheap to build as all parts or subs are available but the electrolytic caps should add up quickly. This run balanced at +/-35V will be a beast to reckon with...

4mA seems about right but I'm with Nate here, the terminals on these transformers are open so they are easy to short. If something like that occurred then who knows what happened internally.

Flipped feedback loop but it has been fixed now.

If the mastering isn't messed up then yeah, high res all the way. Kevin just turns white if you even mention vinyl to him...

It's been some time since we last spoke about that but I'm not sure. It was the set that some idiot damaged and didn't own up to it.

With the HV there was no other alternative but to decrease the current with the onboard sinks. The extra headroom, CCS, better devices and better PSU makes up for that. Now place the amp on some good sinks and yeah, it gets much better.

Too much current through the tubes would be my guess.

The voltage doubler uses next to no current so it's a non-issue. If it did use any current then we'd quickly have to find new drivers for our phones. There is a reason why Stax uses 10nf caps in their multipliers which means they can't withstand any load. As for the boxes, I like the challenge of building amps into boxes that are generally a size too small. Proper grounding and just wiring in general becomes very important but this stuff keeps me interested. You should see the new "super-symmetry state of the art amp" (Kevin's joke... ) I'm working on. Just about as small as I can build something fully balanced with a regulated PSU without building it in layers in a custom box.

That transformer should not look like that so first things first, change the tubes as they are a likely culprit. Second, check the actual socket wiring on the Stax voltage selector as it might be wrong. The SRM-006t is pretty much identical to the SRM-T1 but here is the schematic since I have it. Not the best scan but it will do.

Happy Birthday Dinny!!!

The contact is great if you tin the leads and then feed them through the plug to solder them in. They are a bit of a pain though.

Get them away from that back wall ASAP!!!

Last I heard he was holding a set of R10's hostage from Milos...

There should be a huge warning sign about dealing with APS. Way too many people have had trouble dealing with him in the past year or two.