Well, you can check directly with Creek, that's how I got the schematic.

One can wonder.... Btw Avro, I've been trying out a few different opamps now and currently I'm using a LME49720HA Metal TO-99 which fits so well it's a keeper.

Sorry, I don't have the pcb layout.

If it is the original schematic you are talking about it's posted already some page back.

Quote: thx :)

Ok, I'm all done and here's the final result. Sounds great and will drive my HD650 without issues. This was a well worth effort as I got it really cheap. Tanks Avro_Arrow for your help. Caps in signal path are switched to audio graded ones, 1uF MKP (in) and 330uF ELNA SIMLIC II (out). Larger...

I use a glass head (got it from B&W) with blue led's inside. Pretty cool imho ;)

Ok, last question. There are three more electrolytic caps, C3, C10, C103. Would any of them benefit to be changed to better ones and/or higher value? Or should I simply have them decoupled with 47nF for example?

Quote: Excellent explanation. Thanks! The amp will drive a pair of HD650 (300 ohm). Regarding cap values I'm about to order larger ones for C4/C104 but I don't have too much space to play with here. Will see what I can do with C1/C101. Again, thanks a lot.  

Quote: Thanks for your input! The OPA2134 is just a starter but still considered good by many. Regardless it should be an improvement relative TL071 to begin with. Actually LM4562 which I was aiming for is the same as LME49720 and I'll order one as soon as they're back in stock again...

Hi all, I'm new to this forum but have read it for a while. I know the thread is old but I recently got my self a Creek OBH-11 v1 for coffee money and decided to upgrade it a bit. I contacted Creek and asked nicely if they could provide me with a schematic diagram and they did (thank you). So...