TKD 4CP-601 & 4CP-2500 4-gang volume pot and PCB GB

[obiwan]

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.

[gepardcv]

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?

[MLA]

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. 

[MLA]

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, 2017 by MLA

[ti5002000]

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 

[johnwmclean]

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

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

[Pars]

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, 2020 by Pars

[loz_the_guru]

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.

[Pars]

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

[loz_the_guru]

Brilliant, thanks!

[mwl168]

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

[loz_the_guru]

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? 

[mwl168]

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. 

[loz_the_guru]

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

[culres]

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.

 

[gepardcv]

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.

[audiostar]

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.

[jokerman777]

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! 🙂

[Pars]

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.

[jokerman777]

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!

[Pars]

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, 2023 by Pars

[nopants]

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?

[n_maher]

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.

[simmconn]

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.

[Pars]

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.