Found: source for cheap ladder attenuators

[AR2]

Thank you zapped.
I will check with them.

 

[Variac]

A lot of reports that these are pretty noisey between settings.
If you turn the knob quickly it's like a machine gun!
Sound like they in fact might not be make before break, OR they have a lot of contact bounce.

 

[Peter Daniel]

Technically, they should be make before break and I looked inside and it is the case indeed. It must be a contact bounce. Even the Taiwenese members complained about the noise and use regular pots now

 

[zygibajt]

Peter,are you complaining about them ,too?

I'm just about to order one for my friedn's preamp I'm building.

Bartek

 

[Peter Daniel]

Of course I'm complaining (in more than one thread). They sound pretty good, but the noise in between switching makes them really unappealing. I wouldn't be buying more of them. I have two pcs for sale (22k ea. with slim body style). If interested, I can sell them at $45 ea.

 

[zygibajt]

So it's possible they may not be make before break,or they are but the contacts are too narrow and they don't catch another one before leaving the previous.That is a pity.

I would but I need 5 kohm.
10kohm might be too ,but 22 is too high for sure.

Bartek

 

[Variac]

Bartek,

Peter and I mentioned one other possibility- That the contacts bounce when they are switched from one contact to another.

If I owned one I would experiment with bending the wipers. First to lower the spring pressure. If that didn't help, I would try bending t hem to increase the pressure. Perhaps someone could try this

I am not talking about the detents, but the contacts.

Mark

 

[fdegrove]

Hi,

I am not talking about the detents, but the contacts.

Do they use separate detents and contact races?

Reason I ask is that on the other, more upscale, rotaries I've seen the contact seats serve as detent at the same time...
Which makes perfect sense to me.

Cheers,

 

[Peter Daniel]

Do they use separate detents and contact races?

They do.

 

[Variac]

My Shallcos have separate detents

 

[badman]

I've used their 100k ladder with no noise issues

 

[TUBESMAN]

this link will solve a lot of the translation problems: http://babelfish.altavista.com/ you can input the start and end language and it will translate the site for you. BTW this "POT" site is in traditional Chinese.
73, N2FVS