MLA

Looking good!

Quick update: pots to US/Canada are en route to mwl168 for further distribution. Once mwl168 has verified which board buyers are under my shipping jurisdiction, I'll get the non US/Canada board pile and start shipping those out together with pots.

So, pots are in (this is just one of several boxes. Lots of pot...). So far, I've tested all 4CP-601's. I've tested them for channel imbalance when used as voltage dividers in balanced configuration, i.e. the difference in voltage output between the combined output from the first two channels, and the combined output from last two channels. Maximum tracking error in this config for all pots is around 2-3%. However, that 2-3 percent only shows up at the high output levels ( think last quarter of pot range towards full volume). Below that, tracking error is 1 % or less. With the usual reservations for unknown errors in test setup and/or my math, my conclusion is that we got a fine lot of pots this time around. Should you find otherwise when you get your pots, we'll work it out with TKD. I'll ship the US destined pots to mwl168 tomorrow for further distribution with boards in the US, and when the pot boards from mwl168 get here, I'll commence the non-US distribution.

I think I'll focus primarily on channel balance rather than absolute tracking. I'll check a few in the latter sense as well, but of the pots I've had from TKD so far, all have followed the curve quite well.

... and pots are now in (well, at my local post office, but out of the hands of customs anyway, so I can actually pick them up tonight). Will test them during the weekend as well as sort out the pot-boards US-Europe logistics with mwl168 in best possible way to keep shipping rates down.

Well, if I read this correctly, the perfect replica USB protocol used for backups etc (i.e. bulk with checksums) is not what is used for USB audio streaming, so it would appear that packages at least theoretically can get lost or get screwed up when streaming audio over USB (as hinted by CarlSeibert above). http://www.edn.com/design/consumer/4376143/Fundamentals-of-USB-Audio That said, among explanations for why USB audio sound different in some contexts, I think Craig's observations have larger impact than transfer protocol type: https://www.head-case.org/forums/topic/12477-usb-audio-tweaks/#comment-721196 And it happens to be measurable

Got word from TKD; the pots shipped out earlier this week from Japan, and according to the tracking number they are currently being processed by swedish customs. Should have them in my hands in a few days.

I built one as well; I had some boards made when JimL and KG presented the design and board. Powered it with a KGST psu as that's what I had boards laying around for at the time. Very nice amplifier with just a slightly different sound characteristic than others, can very much recommend a build! Dialling it in is interesting as everything is connected to everyhing else. Takes a while to figure out if one of your input tubes is underperforming, which happened to me Also, I have all windings on the same trafo including the filament supplies, and I had to elevate the latter to avoid hum.

Fees paid. Thanks!

Done. Paid, thanks!

Paid. Thanks!

Now column H should be possible to edit, and I've removed your unintended twin Done.

Interesting... Will fix when I get home tonight, editing google docs on the phone is obviously not my thing

Spreadsheet now has more editable lines. I've put your HC id in, so please add your number to the board type you want in the spreadsheet. I've put your HC id in the spreadsheet, so please put your 3 in the board column you prefer. No exact price estimate yet, but 3-4 USD a piece would be a guess... Your HC id is in now, too, so please fill in board type and numbers. For others who want boards; the name column will remain locked since I don't want to mess up the pot part of the GB in the spreadsheet. If you want boards, just send me your HC id and I'll add you to the name column, after which you can state type and number in the board columns.

Don't have the part code off the top of my head, but it's a 4CP-601 10K with audio taper and no mechanical stops. They should be able to provide a quote from that info.

Someone might but I don't think I am; I stocked up when running the current one so I now have pots for any foreseeable build in the next year or two....

Will do but travelling at the moment, so will fix that when I get to a proper computer.... Update: Done.

Paid, thanks!

Boards received. Many thanks!

Sorry to say, but I closed the GB and placed the order a few days back, and for various reasons its not possible for me to add more pots to the order (I've sent you a longer explanation over PM). I'll refund the paypal payment as soon as it shows in my account. However, if you look in the audio gear for sale post, I think JohnWMclean posted a bunch of different quad pots for good prices yesterday (an updated spring sale post), so I would recommend having a look there unless they are gone already. So, it turns out that TKD just now are changing pin size for the 2511 because they are switching production materials for the internal pot PCBs. The former type (green color) has 3.0mm width terminals, while the new type (black color: injection molding) has 2.5mm terminals. We will get the latest type for our 2511 order, so 2.5mm is the correct pin size. Advice on the change of the resistor board 3-1.pdf

Will do!

I can ask, but I got the CP2500 data sheet directly by e-mail from TKD when discussing pot setup, and it's same as the one posted above, indicating 2.5 mm pin size, so I think that's what they think it is now at least I have a 601 that was produced in may this year, I can check pin size on that one one I find my caliper and see if it matches the data sheet. update: I've measured, and the 601 does indeed seem to be 0.8 mm pin size.

Better safe than sorry in this case I think...

Funny, I have started to think along those lines too but was a little afraid to say it, because I don't have the filter math skills to back it up I realized that the effect is recognizably similar across what must be very different recording rooms. I guess that makes it more of a reverb effect than anything else. If it comes from interaction with the dither as you suggest, its character would then be defined by dither type rather than recording room properties. Fascinating thought.

Savor the moment Happens way too seldom for me... I think it's brilliant marketing; if you're not into filter math/theory it makes the competition look like approximating amateurs . That said, I prefer it to others for stuff recorded in something bigger than a studio booth. Good for the perception (illusion?) of space.