Sure Electronics New Tripath Board 4*100W class-D Amplifier Board

[Virpz]

Originally Posted by meiborg

I too have purchased two of these boards and started modding them slightly. I intended to replace the input capacitors, among other things ofcourse, but was wondering if it would be possible to just remove them all together?

Thing is, they'll be used as poweramps for a 8 channel dsp amp where the signal will be fed bij two minidsp boards wich already got pretty decent 470uF Nichicon Muse output capacitors.

Annyone tried such a thing yet? Can't get less signal alteration from the caps then by removing them altogether i thought .

Greetings, Reinder

Did you tried providing an enclosure to your amp already ?

I see your dsp is going to protect your speakers but how you are going to protect your source from the dc bias?

[meiborg]

Hi Virpz,

I'll have the analog sources connected directly to the minidsp 2*4 boards and the digital sources to a minidigi board. From there the signal passes through the amp to the speakers. With all the signals traveling through the minidsp unit & these having beefy caps on them (470uF is a lot if you ask me, considering where talking 1,5v signals max here) I'm not sure I understand what you mean with protecting the sources? Perhaps I'm missing something here, not an electrician .

Greetings Reinder

Edit:

And some pics of the work in progress. Replaced the buffer caps with Rubycon ZL 1800uF & Vishay 1839 0,1uF bypass. The inductors with Wurth 4,7uH shielded smds parts, had to solder legs to them for easy through hole mounting and mounted them on the back of the board because there's more space there. Shorted the resistors for the dc Offset part of the board. Still have to replace the caps for the low pass filter with WIMA mkp4's and then'I'll probably leave it at that for now, possibly add some Clarity Caps as input caps if the experiment with no input caps isn't satisfactionary.

[meiborg]

Doh, better think it over better huh, the Nichicon Muse are Electrolytic caps ofcourse.. Well, good thing i have those Clarity Caps lying around!

Greetings Reinder

[Virpz]

Originally Posted by meiborg

Hi Virpz,

I'll have the analog sources connected directly to the minidsp 2*4 boards and the digital sources to a minidigi board. From there the signal passes through the amp to the speakers. With all the signals traveling through the minidsp unit & these having beefy caps on them (470uF is a lot if you ask me, considering where talking 1,5v signals max here) I'm not sure I understand what you mean with protecting the sources? Perhaps I'm missing something here, not an electrician .

Greetings Reinder

I still green so I'm not sure if it is safe. Anyway you might want to have a reading here


Mod list looking good. Please, share the results.

[]'s

[Secips]

Thanks to everyone . Got a Sure 4x100. My first dip into class D turned out better than expected. Primarily, got into these because of their cost for a multichannel active setup. Removing DC at the outputs was a notable improvement. I also found that bypassing the tank caps to the nth degree, i.e. 1000>100>10>1>.1>.01>.001 better than doubling or tripling the capacitance. PSU is a Connexelectronics SMPS300R at 30v being fed by differential 250v(125Vx2) AC dedicated line(BX Cable) and dedicated earth ground. Replaced the input caps with 2uf SCR Tin Foil caps from my stash connected directly to the pins of the daughterboard bypassing RCA connectors. Until recently did not what to spend anymore on it as I was just recycling what I had on hand. I finally got some Micrometals 106-2 inductors currently at 10uh. I also have .47uf VitaminQ PIO caps on its way. I'll let you know how it sounds.

Anyway, what I really wanted to ask is... do class D amps have a certain sound? To me, the sound is more mechanical, for the lack of a better word than electronic. Sound of switching devices?

[Virpz]

Originally Posted by Secips

Thanks to everyone . Got a Sure 4x100. My first dip into class D turned out better than expected. Primarily, got into these because of their cost for a multichannel active setup. Removing DC at the outputs was a notable improvement. I also found that bypassing the tank caps to the nth degree, i.e. 1000>100>10>1>.1>.01>.001 better than doubling or tripling the capacitance. PSU is a Connexelectronics SMPS300R at 30v being fed by differential 250v(125Vx2) AC dedicated line(BX Cable) and dedicated earth ground. Replaced the input caps with 2uf SCR Tin Foil caps from my stash connected directly to the pins of the daughterboard bypassing RCA connectors. Until recently did not what to spend anymore on it as I was just recycling what I had on hand. I finally got some Micrometals 106-2 inductors currently at 10uh. I also have .47uf VitaminQ PIO caps on its way. I'll let you know how it sounds.

Anyway, what I really wanted to ask is... do class D amps have a certain sound? To me, the sound is more mechanical, for the lack of a better word than electronic. Sound of switching devices?

By the nth degree you mean that you bypassed the 1000uF with 10uF caps ?
I know what you mean. Although I love the sound of my T amps I still have the feeling that something is missing or the sound is "too correct" specially with the Tk2050 as I found that with the ta2020 sound is more warm and somehow natural. I was thinking about a cheap tube pre amp to correct that but I haven't heard anything that tells if it is really worth.

[]'s

[snoopy33]

Can anyone compare the bass of this model compared to the 2x model? I find the 2x I have lacks authoritative bass around the 100-200Hz range. This has been reported by several people so looks like a board design issue.

[jfle98]

Not to offend but Seriously !
I bought one of these (2 X 100 watt) with a Meanwell 27
volt supply and I don't think these are putting out more
than 10 watts. Maybe I had a dud ! Does anyone have any
(real) data that shows what these things really are capable
of ???

[AndrewT]

Read the specification. They are not 100W amplifiers.

But, they are capable of a lot more than 10W.

[tabarddn]

I have read through the blogs on theses amps and altough they seam to sound good they are unreliable and can run hot.
Just a thought, they are as cheap as chips so why don't you guys buy two boards and run them as a duo mono set up with input to one channel only. Therefore they should run cooler, sound better (Duo mono set up, no crosstalk) and if one channel is defective or blows up!! switch to the other channel. Anyway that's what I am going to do .