Fun with T-amps - I didn't know what I was missing.

[[email protected]]

Re: Fun with T-amps - I didn't know what I was missing.

will you elaborate. i dont see what you mean in that post.

[philiparcario]

Re: Fun with T-amps - I didn't know what I was missing.

phil, do you know anything about this.

http://www.electronickits.com/kit/complete/ampl/k100.htm

it would be cool to imcorperate the pre right into the same enclosure.

that kit is active and needs a lot of solder work. I may advise just add a volume pot

[[email protected]]

Re: Fun with T-amps - I didn't know what I was missing.

please suggest one.

[sendler]

Best sounding pot

please suggest one.

These PEC pots are suddenly very popular based on their sonics.
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http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KKA1031S28-ND

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Edit: I just read the thread at DIY audio to the end and these pots suffer poor channel tracking so I will have to pick something else.
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http://www.diyaudio.com/forums/chip-amps/40676-so-i-did-try-all-those-different-potentiometers-31.html

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Or, you could just use something cheaper to get started. I use 4k, switched shunt stepped attenuators built with .1% surface mount resistors which cost $100. The earlier post that stated that Sure recommends an active pre is backwards. Sure actually cautions against it. There is protection on the board (which I remove to improve the sound) but one of the peculiarities of the the Tripath chip set is that if you clip the input with a signal of much greater than 4v, you can blow the amp.

[danklugherz]

Re: Best sounding pot

These PEC pots are suddenly very popular based on their sonics.
.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KKA1031S28-ND

.
Or, you could just use something cheaper to get started. I use 4k, switched shunt stepped attenuators built with .1% surface mount resistors which cost $100. The earlier post that stated that Sure recommends an active pre is backwards. Sure actually cautions against it. There is protection on the board (which I remove to improve the sound) but one of the peculiarities of the the Tripath chip set is that if you clip the input with a signal of much greater than 4v, you can blow the amp.

I must apologize for stating Sure recommends a pre-amp for input control, however nowhere in Sure's user guide for the 2*100 board does it say you can't. The user guide states if you use a pre-amp the gain switches must be set to low. Sendler is correct that Sure warns against using a pre-amp on the 4*100 boards that it could burn out the boards only because that board doesn't have gain switches. Sure also recommends a 50k pot for volume control but there seems to be alot of confusion on which one to use at diyaudio. Sendler why not use a 20k-50k pot? I've never really gotten a straight answer on this.

Dan

[sendler]

Passive volume controls

I must apologize for stating Sure recommends a pre-amp for input control, however nowhere in Sure's user guide for the 2*100 board does it say you can't. The user guide states if you use a pre-amp the gain switches must be set to low. Sendler is correct that Sure warns against using a pre-amp on the 4*100 boards that it could burn out the boards only because that board doesn't have gain switches. Sure also recommends a 50k pot for volume control but there seems to be alot of confusion on which one to use at diyaudio. Sendler why not use a 20k-50k pot? I've never really gotten a straight answer on this.

Dan

Sure has a note on the page for the 2X100 at the bottom cautioning about the use of preamps even though the 2X100 features a sound robbing limiter across the bottom of the input jacks. In practice, common sense use of an active pre won't be a problem. In other words, make certain the volume knob is turned down before switching on the amp and don't push it beyond where it starts to sound bad.
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The only problem with passive volume controls is the high output impedance which interacts with whatever cable and actives that follow it. Passives are a trade off between having an input impedance that is high enough for your source to drive easily and, an output impedance that is low enough to minimize the interactions such as loss of dynamics and roll offs at the frequency extremes. Pick the lowest impedance volume control that your source still sounds good into and eliminate any wiring following it. Generally, modern solid state sources will easily drive 10k. If you mod the 2X100 for use with an in case passive volume control, you can also eliminate the terminating resistors R14,34 as per the diagram that audio1st has posted in order to raise the impedance that is trying to load down the passive control.

[philiparcario]

Re: Fun with T-amps - I didn't know what I was missing.

that kit is active and needs a lot of solder work. I may advise just add a volume pot

the amp in my photos has an alps blue velvet mono pot . that amp is a monoblock

http://www.partsconnexion.com/t/econnexion/0510/may10.html

http://www.partsconnexion.com/product7381.html

12 bucks does one channel for me. i prefer a separate one for each channel lets me balance the channels how I like. really helps in some rooms.

[[email protected]]

Re: Fun with T-amps - I didn't know what I was missing.

that one does not mention wattage. is this important? would this work just as well?

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=023-650

[philiparcario]

Re: Fun with T-amps - I didn't know what I was missing.

the alps are higher quality

http://www.alps.com/WebObjects/catalog.woa/E/PDF/Potentiometer/MetalShaft/RK271/RK271.PDF

http://www.alps.com/WebObjects/catalog.woa/E/PDF/Potentiometer/MetalShaft/METAL_INDEX.PDF

watt rating is not that important. it is line level signal low watts and low volts are the rule.


most cd players are 2 volts max at low amps so very low watts pass through it. you can start with the stereo pe and if it sound bad upgrade to the alps.

[[email protected]]

Re: Fun with T-amps - I didn't know what I was missing.

i'll trust you on that. thank you.

now i'll just have to figure out how to hook in up.

[philiparcario]

Re: Fun with T-amps - I didn't know what I was missing.

west host how to wire a pot. some one has the link please I think elliot wrote the blog

[sendler]

Hook up diagram

now i'll just have to figure out how to hook in up.

Look at the diagram I linked for you a few posts back. It shows how to connect the pot.

[WWWJD]

Re: Fun with T-amps - I didn't know what I was missing.

Here's a good source for the Alps Blue Velvets; I've purchased from them twice now. Shipping is quick and the price is right.

http://www.partsconnexion.com/controls_pot_alps.html

[sendler]

ESP on pots

west host how to wire a pot. some one has the link please I think elliot wrote the blog

ESP writes about pots here.
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http://sound.westhost.com/pots.htm

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[critofur]

Re: Fun with T-amps - I didn't know what I was missing.

Here's a good source for the Alps Blue Velvets; I've purchased from them twice now. Shipping is quick and the price is right.

http://www.partsconnexion.com/controls_pot_alps.html

Which one to use with the Sure 4 x 100 amps?