On 12/20/2016 at 6:02 AM, mwl168 said:

All except 3 US/CA destined packages have been shipped yesterday.

Of the 3 remaining packages, 2 has not responded to my inquiries and 1 has asked for package to be held and shipped later.

I sent the payment yesterday. Please let me know if you got it. Thank you.

I'm looking at the TKDs from the GB and comparing them to the last 10k one I had from when I bought them in Japan myself. My old one has a different marking on the right side (looking directly at the shaft): A10KΩ. The GB ones just say 10KΩ. Should I be concerned these aren't logarithmic audio taper?

Well, log audio taper is what I ordered and I'm pretty sure that's what we received. That said, while I've tested all pots I only checked the taper on the first few (which was log audio); the rest I tested for channel imbalance only.

If you want to make sure yours is log audio, please remember to test it as a voltage divider (the ladder construction puts resistance measurements off the log curve). Hook it up to a small battery or similar and track Vout from the viper. Should it be the wrong taper, let me know and we'll sort it out. 

So, there seems to be competition in the market; behold the TKD-401. This looks like stereo only, but I bet between channel tracking is very precise, as long as you keep going straight.

 

Edited June 21, 20179 yr by MLA

I don´t know if it will have good channel tracking because, it is after all, a lower grade of the tkd 601 . Lower grade products are always worst ...imagine if they haven´t proper balanced alimentation..it will be even worst 

Anyone have a spare board? ...if possible a spare 4CP 2500?

I have a bunch of stuff if tradings good for you!

I probably have one I can spare John. I'll take a look and PM you. PCB that is... don't have any actual 4CP2500s.

Edited August 10, 20205 yr by Pars

Hello all, apologies for resurrecting an old thread but does anyone have a PCB for the 4CP-2500 going spare? Happy to pay for it, i've managed to pick one up elsewhere and it would be great to get a board and avoid any potential damage to it.

I don't have any spare boards left, and I thought I had posted the gerbers in this thread, but I guess I hadn't. Here are the gerber files for the 2-pot (CP601/CP2500) and 3-pot (CP601/CP2500/Alps RK27) boards. Some place such as seeedstudio.com can run these for pretty cheap. Just give them the entire .zip file.

TKD 4CP 2 pot final.zip TKD 4CP 3 pot final.zip

Brilliant, thanks!

I may have spare boards left but, given the shipping cost, it probably makes more sense for you to have them fabricated.

I'm in the UK. We don't seem to have any companies here set up for this sort of thing, so I'll probably be buying from china/the US anyway. 

 

Agree RE shipping costs, unless you happen to be this side of the pond too? 

7 hours ago, loz_the_guru said:

I'm in the UK. We don't seem to have any companies here set up for this sort of thing, so I'll probably be buying from china/the US anyway. 

 

Agree RE shipping costs, unless you happen to be this side of the pond too? 

I am in US and figured you are in UK thus the comment on the shipping cost. 

Thanks, all ordered now. Have to wait to get set up but excited to hear the difference

On 2/1/2021 at 9:19 PM, Pars said:

I don't have any spare boards left, and I thought I had posted the gerbers in this thread, but I guess I hadn't. Here are the gerber files for the 2-pot (CP601/CP2500) and 3-pot (CP601/CP2500/Alps RK27) boards. Some place such as seeedstudio.com can run these for pretty cheap. Just give them the entire .zip file.

TKD 4CP 2 pot final.zip 31.36 kB · 27 downloads TKD 4CP 3 pot final.zip 33.96 kB · 14 downloads

Thanks a lot Mr. Pars.

 

Does anyone have 4CP-601 pots in 10k audio taper that you’d be willing to part with? I have now run out of my supply from this GB (my goodness, so long ago) and want to buy a couple more.

If some are available would be interested as well in 4CP-2500 and may be 4CP-601 as well in 10k.
Anyone has some, please PM. Thanks guys.

On 2/1/2021 at 8:19 AM, Pars said:

I don't have any spare boards left, and I thought I had posted the gerbers in this thread, but I guess I hadn't. Here are the gerber files for the 2-pot (CP601/CP2500) and 3-pot (CP601/CP2500/Alps RK27) boards. Some place such as seeedstudio.com can run these for pretty cheap. Just give them the entire .zip file.

TKD 4CP 2 pot final.zip 31.36 kB · 53 downloads TKD 4CP 3 pot final.zip 33.96 kB · 36 downloads

Hi Pars, wonder what pad size do you use for the 4CP? I'm going to make a board for 2CP. Thanks! 🙂

I used a long pad type in Eagle which was 2.1844mm with a 0.5mm drill hole. I then put a milling slot on it (instead of a hole) which was 3.2mm long x 0.8mm wide. The older TKDs had larger tabs on them than the more recent ones do. This pad works for either.

These boards work fine for a 2CP (I'm using one for that now). You could cut part of the board off for that if you wanted.

35 minutes ago, Pars said:

I used a long pad type in Eagle which was 2.1844mm with a 0.5mm drill hole. I then put a milling slot on it (instead of a hole) which was 3.2mm long x 0.8mm wide. The older TKDs had larger tabs on them than the more recent ones do. This pad works for either.

These boards work fine for a 2CP (I'm using one for that now). You could cut part of the board off for that if you wanted.

ohh my bad I mean the pads for the 4CP-601 not the 2500. But cutting your 4 gang board is a good idea too, thanks!

Oh, those? They are just bog standard round pads, 1.1mm drill. I used a 1.9304 size on them instead of the Auto in Eagle. I used a square pad for pin 1.

EDIT: Here's the datasheet as it is helpful

tkd cp600as-e.pdf

Edited February 26, 20233 yr by Pars

I have a balanced tkd 4cp2511 with some low-level balance issues, is there an easy way to fix this or did I just get a lemon?

49 minutes ago, nopants said:

I have a balanced tkd 4cp2511 with some low-level balance issues, is there an easy way to fix this or did I just get a lemon?

No way to fix as far as I know and not entirely uncommon.  Some of us are more aware or more sensitive to this than others.

I’d plot the attenuation curves of the 4 individual pots and see if I can mix and match to minimize the error in the rotation range I care the most.

That is what I did with a 2CP I bought from PartsConnexion. I measured and plotted the response at several points, and sent it to Chris Johnson of PcX. He replaced it, and the replacement is fine.