In search of a perfect attenuator

[Destroyer OS]

TVC or PA (perfect attenuator)?

> or < ?

There is my question!

 

[Peter Daniel]

TVC or PA (perfect attenuator)?

Both are fine and it's more a matter of system balance, voicing and proper setup, than superiority of one over another.

TVC will stay in my current system, especially when I need it for single ended to balanced conversion and it is already integrated with the amps.

In in the new system I'm currently setting up, I will use PA, as I want to run multiple amps (all single ended). PA needs a source with a good buffer for proper dynamics, TVC is less forgiving in that aspect as its input resistance can be very high.

When everything is well done, PA may have advantage, as it will be probably more neutral than TVC, but TVC can still make up for the defficiencies of a less perfect system.

PA also offers more steps (128 vs 24).

 

[impsick]

Hi Peter,

Where did you get the grayhill? I have a 7gang one..but know someone who is looking for grayhill switches like that.

Regards,
Bas

ps..I have not tried that many attenuators..and especially not in the same setup. But so far I like the DACT units and my Grayhill with intactaudio AVC. Next up....DiyHiFiSupply amorphous TVC's. On the same Grayhill (7gang) so comparison should be easy.

i have access to greyhills. if you need.

 

[impsick]

can anyone please tell me if these apls are fake or not? i've been searching all over the web and there is plenty of talk but no images to go with. for the most part everything looks like an alps except the pins/lugs which i cant find on the alps site..

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Destroyer OS]

I just got a 100k alps from Parts Connection and the connecters on it are straight, no holes.

 

[impsick]

I just got a 100k alps from Parts Connection and the connecters on it are straight, no holes.

yeah i know. say if you can or have some time could you take a pic of the insides, just with the back off? i'd appreciate it.

 

[raromachine]

Unsolicited!

The one with Pins is from AMB's store, and the one with lugs is from a store in Taiwan that I mail ordered from.

 

[impsick]

nice pics raro!!!
they look identicle. do they have the same number of brushes?
here is a shot of mine.

you can see 7

 

[raromachine]

Heh - my little digital camera doesn't quite get that close - but it looks like 7 to me.

 

[impsick]

sweet man. ya i couldnt count them till i got the shot. so you would agree buy the looks of things that they are legit? i wonder why the lug style isnt on alps web site?

 

[raromachine]

It's as legit looking at the one from AMB - and I'd say that was as legit as they come.. It's probably that it's just not terribly popular or something - I imagine most orders would be for pots that can be mechanically placed and soldered.

 

[impsick]

word. thanks for the help bro you made my day, or night **** its almost 3am.
peace

 

[veteran]

The best thing in this attenuator is that the input impedance is always constant while output impedance changes - just like in a normal potentiometer. Using quality and low tolerance resistors this will be very good volume control

 

[farl]

can we start ordering the PCB?

 

[felixx]

Hmm.....what do you think about this:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=80194&perpage=10&pagenumber=10

 

[Peter Daniel]

Hmm.....what do you think about this:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=80194&perpage=10&pagenumber=10

Hmm....there's nothing to think about, you need to build it and try to know for yourself

 

[impsick]

say Peter or anyone... what king of pots are used in the Grace Design M801 mic pre? anyone know?

 

[v-bro]

Stop searching for the perfect attenuator.....that is if you can believe what they say about this one:
http://diyparadise.com/maggie.html


They don't seem to worry much about using a switch, but neither do I...

 

[v-bro]

Nevertheless I like your project a lot, very nice design and nice display as well!

 

[Peter Daniel]

Stop searching for the perfect attenuator.....that is if you can believe what they say about this one:
http://diyparadise.com/maggie.html

Well, somehow I can't believe
But maybe you should read what they say about this one: http://www.6moons.com/audioreviews/audiozone4/pretone.html