TKD 2CP-2511MC motorised pot.

[bob orbell]

Hi all, I have asked this question before, but would like to get some more answers, I am thinking of buying the above pot to use in my pre, ( posably the last uprade ) I want to conect it as normal operation, not shunt, the diagram on Hi Fi collectives site looks as though the conections will be the same as an Alps pot, but the wording is in poor english, I do remember someone on here having dificulty with one of these pots. Can somone help please. Bob

[TimN]

Hi Bob

Looks to me like it's saying you can use it "normally" but not as a shunt, but I agree the wording could be better.

Drop Nick Lucas an email on sales@hificollective.co.uk and ask him. He's usually very helpful.

Tim

[bob orbell]

Thank's Tim, I think you are correct as I have been on other forums that say the same, an email to Nick is good advice. Bob

[A Stuart]

You might find this of interest https://www.tkd-corp.com/otherpdf/Im...nts_LADDER.pdf
assuming this relates to the potentiometer in question.

Looking at the circuit diagram, I guess that while turning the control, resistances of both top and bottom halves of the divider vary in an odd fashion, which would explain people thinking that it measured weirdly and thinking it was defective. As it obviously works or else they would not sell it, the ratio of top half to bottom half must adjust progressively over the range.
I have not worked out why this complicated circuit should be beneficial. Perhaps it feeds the output from a more constant impedance than a simple pot would, possibly with a view to feeding long studio connections.

Also, if I am correct to suppose the resistance of the "bottom" half of the divider varies in a complicated manner as the slider moves relative to attachment points of the internal shunting resistors, then that would explain why it would not work well in shunt mode with a fixed external resistor.

Or perhaps it is a rather sophisticated version of the pseudo logarithmic potentiometer, which allows the track to be built linear, which I once read has a manufacturing quality advantage. Would require head scratching. Was it you with the mathematically inclined friend?

[bob orbell]

Well I have just ordered on, I will post when fitted and report my findings. Yes Alastair, I do have the maths man to hand, although it looks like on resistance with resistor taps to 0 volts, could be clever thinking. Bob

[bob orbell]

Hi all, TKD motorised pot arrived on Saturday, about two hours latter it is in neatly and working. The very first thing that I noticed was a reduction in gain, I now needed to turn the volume control about 80 deg. further to achive the same sound level, this is a very positive point as I had too much gain. So the first album, Pat Metheny & Lyle Mays As falls wichita so falls wichita falls, has lots of piano work and Pats guitar. The bass apeared to sound less powerfull, but latter I found there was less overhange, mid range, vocals, guitars etc are now more fowared in the mix, HF now appeares to exstend almost into infinerty. There is no harshness at all and after five different albums, no fatige, I could have listerned all day, it realy is so good. Over the years I have had very good results from most upgrades, IE regulated power supplys, bulk foil resistors etc, but this pot has produced the best upgrade to date, was it worth the £118.00 ? yes, no question and I am sure it would be benifical to the Pre III and others. Bob

[TimN]

Hi Bob

What did you change to the TKD from? Was it a standard Alps pot? Did you stick with the same rating? i.e. 50k?

Assuming you have a remote in your Pre3, how did you install the IR receiver "eye"?

Tim

[bob orbell]

Tim, it was a 100K Alps motorised, the TKD is also 100K, I will have the Pre on the bench some time this week, I will take and post pictures of the Remote components. Bob