Pars

You make a good point as always I was planning on running @ 16V or so. I'll see what happens, but will probably stay around 16-18mA. I don't really want to use OPA445s for the servos, so need to stay below 18V.

Anyone have the latest DynaFET schematic, preferably showing the feedback options? The only one I am finding is the .png one that j4cbo had... Nevermind... I found the balanced DynaFet schematic so can discern what I might be looking for from that.

Kevin, After looking at the datasheets for the BJTs, 16mA seems rather low for these devices. Even the 18mA you noted on the previous page seems low. These seem pretty linear all the way out to 70-100mA. Any reason not to go higher than 18mA on these? I am currently measuring hFE on the PNPs (from Avnet). Still waiting for the NPNs from Mouser. At ~16mA, using this circuit, with 100K Rb and my Fluke in series on the base in uA mode, I am not experiencing the transistors even getting warm after 2-3 minutes. Current parameters I am planning on using for matching: V = 7.5Vdc Rb = 100K Ib = ~70uA Ic = ~16-17mA The original 2SA1015 / 2SC1815 in the Dynalo are considerably lower power handling. Looking at the datasheet, I can see where 16mA was a good operating point for these. Thanks. BTW, anyone still looking for thru hole devices: Avnet has the MPSW56s (around 1500 still left). Mouser still has the MPSW06.

Happy Birthday Naaman!

Don't you need to ground the - inputs to the board when using the RCAs?

Chinese trimpots? Has anyone tried these Bourns "clones" on ebay, such as this one? Funny, they use "Burans" but same font more or less as Bourns uses. I have a few of these and haven't noticed anything peculiar about them as compared to an actual Bourns, but wondered if there are any hidden gotchas, such as abnormal drift, etc.? EDIT: I see some posts on diyaudio about these, one in particular stating that the fakes are carbon vs. the cermet of the actual bourns. I'll buy the bourns...

How is the toggle switch on the back wired? It only affects input selection?

Too small is definitely worse. I normally ride the large end of the scale according to the numbers I got from Competitive Cyclists fitting tool.

Wow, that is really nicely done, with great attention to detail!

Happy Birthday!

Thanks Kevin. That is what I figured.

Happy Birthday!

I don't know if you would parallel the device to limit it to 270V or put it in series with the collector or emitter?

Happy Birthday Colin! Hope you have a great one!

You might check with Jim McShane... good guy and seems to know his shit http://www.mcshanedesign.net/tubes.htm

Happy Birthday Steve!!! and glad to see you back

Happy Birthday!

Happy Birthday Ed!

I'll vouch for Michael as someone who you can trust in this GB. I just worked a deal with him for a pair of Multiamp boards, run by the same board house and identical process, and they are very nice PCBs. Michael is a pleasure to deal with, so if you want a set of KGSSHV boards, this would be a good way to get them.

^ This. Best wishes NE folk...

Happy Birthday!

Yep, feelin sorry for you east coast peeps. That is a fuck ton of snow already!

Interesting. I hadn't looked at the product tech page when I posted above. Have you actually heard a difference using these cables versus others?

do tell...

I think ours is the AWN432. My wife thinks we paid around $500 or so for it, but that was at least 5 years ago or so. We've been happy with ours, but I haven't read up on them lately.