luvdunhill

my first DIY project was the best sounding amp I've ever built

depends on the upgrades I'd assume, like the 384kHz options.

A 5V fixed regulator, >1A. Like, LM323T or KA78T05 Available at Mouser for pennies I'm sure .. if no one has one and a envelope, I'll probably just shelve this until the next oversight

yay......... the F1 wasn't even meant to drive dynamic drivers, so actually making an amp that was designed to do this would be a huge improvement.

I just bit the bullet and ordered the stax jack jig. Should be here the end of the month.

heh. I just saw "KGSS" and "bias" in the same sentence, despite the fact that this is a Koss thread.

ummm...... er.. yes, it is adjustable on the inside maybe not in the manner you are thinking... oh wait, *that* bias... erm.. yeah!

the above's younger brother

use the schematic, it will be much easier than looking at the board silk, and much less error prone.

I don't have a schematic. I do have a schematic for another Ayre product and the complexity is mind boggling.

30 pairs of the output devices used in the Ayre V-5xe. Not that I know what I'm going to do with them... but...

Just curious, of all of the DACs that you've listened to, how low has your end transducer been able to accurately reproduce? I feel that the important differences in jitter manifest themselves predominantly in low(er) frequencies.

my measurements look right on. Now to find someone who is placing a FPE order soon. I don't want to pay another $8 for a 2 sq in. FPE design that already costs >$30

You need to try it in higher concentrations.... use bitter almonds.. they work better... or maybe cassava leaves.

I don't know, have you tried good ole fashion, non-RoHS lead? Or perhaps almond-plated?

I was wondering if the bear grabbing the two kiddos was a biblical reference...

Reks needs to experiment more with shovel plating. He's very predisposed.

Smeggy: Can I take you up on that 6-pin Stax plug? It would be much appreciated!

TO3P, not TO3 Similar to a TO-247 package. Yes, the metal can TO3 would be pretty hard to do. For how to mount and heat sink, it would be similar to TO-220, see the 2 pics posted above. I don't have any immediate plans for using these output devices. The Hitachi LFETs are probably some of the more counterfeited devices out there. The Magnetec/Semelab/"whoever the heck in the UK they are now" versions are pretty cool, but cost an absolute fortune, and for matched versions, you better forget it (they were often sold as matched sets, and if you don't find them this way on the used market, you're kinda hosed). I think these versions (and their other "improved" devices) are probably the holy grail of (L)FETs available for power amp use.

What about putting in a subpanel in your listening room? I've been contemplating whether or not there are merits in this topology for a while. I think there are a number of proponents of this over at Audiogon ... you could ask over there as well.

part of the reason I've started attributing this fact to is the relatively poor channel separation that vinyl rigs have... it's like built in crossfeed

Jacob: Looks fantastic to me! I do need to sit down and verify the schematic though... I have a few questions. What footprint are the large output resistors? I think it would be nice to accommodate two Digikey part P2.0W-2BK-ND per location (used in a lot of Nelson Pass designs) and if someone wants to drop a lot of cash, the Mills MRA-5. Also, could the TO-220 regulators be omitted for the TO-92 versions? Basically these just have to regulate the Iq of the opamp at a 15V drop? I'd increase the pitch of the four PSU bypass films. I think something with LS=5mm and 5.5Wx7.2L (i.e. Wima FKP2 10nF) would work well. Finally, what are the dimensions of the large PSU rail caps? 5mm pitch by 10mm diameter? I just want to have a particular cap in mind for that spot before we commit on the boards, as it seems that we have room to increase the size slightly.... We should look at the standard candidates from Panasonic and Nichicon. Very nice by the way.

dunno yet. crossing fingers though...

man, I had no idea how big this custom R-core would be......puny Ebay model shown for scale.

Ok, just remember power doesn't (always) equal gain. You can have a 500W amp with zero voltage gain.