FallenAngel

What's the estimated time frame for this group buy? As in, when will the order be placed and shipped out?

Very cool, thanks. It looks like I'll be using unbalanced input from the DAC, unbuffered, with a 10k resistor to ground as fake pot and all should be peachy.

Cool, signed up, thanks.

Somebody have boards? I'm building the Dynalo MK2 and wanted one

Awesome thanks. Are schematics available for the new amp? Mainly asking because I might not put a pot in this build and run it off a DAC with digital volume control, as well as wiring unbalanced vs balanced outputs. The DAC will be the Soekris discrete R2R DAC and I kind of wanted to skip the buffer section. I'm assuming I can use the TL81 instead of the OP27 for DC offset control. I think it's a better chip in specs. Similarly the OPA134. Preference on the opamp to use?

Thanks, it would be awesome if I could grab those. I used CircuitPeople to check out the lateest (2/6/2016 8:25 AM kgdynalobal9.zip) It says SS Dynalo Rev 1.2 and it looks like it uses PZTA06 / PZTA56 SMD parts (I count 11 of each per board). Is there a parts list somewhere here?

Which version were they? I don't have the software to look at the files but I might have to install it and figure out which parts are used.

Are boards available somewhere?

Looks like a great project, what's the timeline on first batch of boards? Also, how is the availability on the LSK/LSJ parts? I haven't seen then outside of a group-buy from Linear.

Hi guys, I'm hosting a meet at the party room of my condo in Toronto, Ontario. Full details at Head-Fi. Anybody interested in coming is welcome. If possible, please post in the HF thread, if not, post here and I'll simply put you on the other list. Thanks and hope to see you there.

Hmm... I started with the trimpots fully counter-clockwise, no wonder it starts at such high voltage before. I'm thinking that explains a bit. Wandering which part is burned again, but good lesson learned.

Getting a VERY funky reading across R3/R4 - it's a dead short! I've removed the trimpots and checked them, they're good at 5K. The 2K2 resistors don't look burned at all, but I'll remove them now and check them. Nothing else should be able to short that unless the MOSFETs are fried. Just found that Digikey started stocking IRFP240 & IRFP9240, just ordered a pair last night, getting them delivered tomorrow (oh how I love Digikey Canada - $8 for overnight shipping).

Yay, 1 channel running. Noticed some very funky instructions in the Pass guide to this amp - it says to start with both trimpots at minimum - that resulted in about 8V across R12, had to very quickly adjust it to get a more reasonable voltage, was scared I burned something. Second channel is getting some funky bias settings (where I reversed PSU polarity), replaced R11/R12 and 450/550s and the input jfets, but can't get above 0.4V across R11/R12. Could the mosfets be fried? It sounds strange, as I'd expect to get 0 output then. This board was getting 0V across the resistors before I replaced 450/550s. No change after replacing the jfets. Any ideas? I'm a little lost, not really sure what to replace next, except the mosfets as all the resistors look fine (not burned).

Just one board, but the other had other issue, unlucky build, will be going through it double checking every part after weekend.

Oh, I'm certainly having an issue Reversed V +/- polarity from PSU and burned the 0R47 resistors, replaced them but something else must be fried, probably 450/550s.

Considering building EUVL's F5X?

Yay, my F5 is almost done, doing final testing and biasing it tonight! No preamp yet, not until I finish building the Buffalo2 with digital volume control. Hoping the amp will nicely drive my Harbeth HL-P3ES-2 : 6 Ohms, 83dB 1W/1m in a small room.

Oh yeah, that DIY job makes me feel better about taking on an F5 build for Christmas

Really hard choice. Having compared a 2-channel Beta22 (well, technically "half of a balanced" Beta22) with Sigma22 PSU to a Dynahi with Dynahi PSU, I'd say they're both damn good and you'll be happy with either. I thought the Dynahi was a little warmer and perhaps more involving to listen to while the Beta22 was gloriously neutral sounding, it was just fantastic and did everything well, though perhaps less "intimate" than the Dynahi. Do note though, that Dynahi is a heat-monster, felt like a little space heater on my desk.

Most definitely in on this.

Yep, that's the one I brought to the meet. No stability testing, just by ear.

Very cool build Doug! Now if only we could compare notes