These are on ebay now for <$60 shipped. Don't think it comes with power supply though.
Anyone tried one? Seems like a reasonable deal.
Anyone tried one? Seems like a reasonable deal.
There has been much discussion on these boards. Several DIY-ers have made interesting mods to change input and/or output side of the board. Do a search and you will find some amazing results for this neat little amp that can hold it's own.
I'm not asking about the boards. I'm asking about the finished product they are selling and how it stands up as a finished product.
I will be looking at one later today (or tomorrow for Western hemisphere - it's 7:30AM on the 10th here).
Hello,
The electronic volume control makes this amp unusable. Distorted at low setting of the amplifier extreme. An ordinary potentiometer would have made more sense. Thus, this amplifier can be used only as a power amp.
In addition, the electrical phase is rotated by 180 degrees. One speaker cable to a port had to be reversed on the board to play with the speaker in phase.
Both are unforgivable error. Quality control by Sure-Eletronic seems to be deficient.
Sonically much better alternative is the SMSL SA-50 or Dayton DTA-100.
Also Hifimediy TK2050 T2 amplifier sounds significantly better.
Greeting
Michael
The electronic volume control makes this amp unusable. Distorted at low setting of the amplifier extreme. An ordinary potentiometer would have made more sense. Thus, this amplifier can be used only as a power amp.
In addition, the electrical phase is rotated by 180 degrees. One speaker cable to a port had to be reversed on the board to play with the speaker in phase.
Both are unforgivable error. Quality control by Sure-Eletronic seems to be deficient.
Sonically much better alternative is the SMSL SA-50 or Dayton DTA-100.
Also Hifimediy TK2050 T2 amplifier sounds significantly better.
Greeting
Michael
Attachments
Well, that settles that. Still holding out for Hifimediy T3 or T3_v2 to be for sale I think.
Thanks for reporting in on this thing.
Thanks for reporting in on this thing.
I have sent an email to Sure on the volume control issue and they replied on Tuesday (GMT +8) that they will look into it. Well, today is the deadline and if I don't get a satisfactory reply then I'll be sharing what I know with the rest of the internet.
(Sneak preview: "Distorted" does not give the full picture of the problem. Although technically it is distortion.)
(Sneak preview: "Distorted" does not give the full picture of the problem. Although technically it is distortion.)
Again, thank for the info about the sure.
I see that for you the smsl SA50 is far better, but apparently it uses a TDA7492 which doesn't seem to be appreciated in some threads...
http://www.diyaudio.com/forums/clas...tests-hifimediy-t2-ljm-l20d-sure-tda7498.html
I know it's the TDA7498 in this one, but they seem pretty close.
Actually, i have an smsl dac and amplifier on my main system and i'm pretty happy with them, so the SA50 could be the next improvement...
Could you tell us more about it ?
Thank ! 🙂
Had a similar problem with a first Sure ta2024 amp, one channel faded away at low volumes. Is there a way to bypass it completely, unsolder it / replace with analog pot?
Had the same impression but they agreed on replacing the defective unit after a short email exchange (it's a plus but why not avoid it with better QC? )
BTW, I ordered a t2024C, third revision of the 2024: they firs send me a 2024 plain (first revision), the replacement was a 2024B, second revision, although the nice packaging said 2024C. WTF??
So my advice to SURE: less packaging and more quality.
Alright, time's out for the people at Sure.
The sounds does not simply distort at low volume settings, the amount of bass actually grows (relatively) as volume is reduced until it becomes nonsensical. But, if my ears didn't fail me, if the volume control is increased past a certain point the bass becomes too little instead and the sound also becomes nasty.
This is a recording of the output, I tried to keep overall output level the same by manually changing source's volume while turning the amp's volume knob in the opposite direction. Recording starts with volume of amp at mid, reduced, increased to max, then mid again.
Sure recorded vs original.zip
There's also the reverse phase issue as mentioned by Saarmichel. On my unit the color of the RCA connectors are also reversed. (The letters are correct.)
The red RCA on my unit is also too tight. But this is what happens when cheap parts are used.
Sure 2x100W TK2050 completed amplifier - Too tight RCA - YouTube
The reverse phase and volume control issues are too improbable to be caused by careless mistakes during assembly or cheap parts. It has to be a design problem.
I will this as a power amplifier, after modding to bypass the volume control. The the PT2314E is rated at 0.03% THD @ 1V so it can bottleneck the TK2050's performance.
The sounds does not simply distort at low volume settings, the amount of bass actually grows (relatively) as volume is reduced until it becomes nonsensical. But, if my ears didn't fail me, if the volume control is increased past a certain point the bass becomes too little instead and the sound also becomes nasty.
This is a recording of the output, I tried to keep overall output level the same by manually changing source's volume while turning the amp's volume knob in the opposite direction. Recording starts with volume of amp at mid, reduced, increased to max, then mid again.
Sure recorded vs original.zip
There's also the reverse phase issue as mentioned by Saarmichel. On my unit the color of the RCA connectors are also reversed. (The letters are correct.)
An externally hosted image should be here but it was not working when we last tested it.
The red RCA on my unit is also too tight. But this is what happens when cheap parts are used.
Sure 2x100W TK2050 completed amplifier - Too tight RCA - YouTube
The reverse phase and volume control issues are too improbable to be caused by careless mistakes during assembly or cheap parts. It has to be a design problem.
I will this as a power amplifier, after modding to bypass the volume control. The the PT2314E is rated at 0.03% THD @ 1V so it can bottleneck the TK2050's performance.
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Bypassed the volume control with capacitors from RCA directly to TC2000 input.
The input circuit is identical to the one in Tripath's datasheet. Just that the R(OFA) resistors are of different values.
And offset adjustment, another thing worth complaining about. My unit came with 50mV on one channel so I decided to adjust it. But the offset trim pots are under the heatsink and the TK2050 needs to be sinked. So I had to remove the heatsink, adjust, hold the heatsink down, on the amplifier, repeat. And to top it off the values of the pot and resistor made huge swings possible - my first adjustment gave me >4V, small adjustments resulted in few hundred mVs. I got lucky in my final try to somehow got <10mV. But with such trouble to adjust offset, I can guess why it was not properly done before the unit was shipped.
The input circuit is identical to the one in Tripath's datasheet. Just that the R(OFA) resistors are of different values.
And offset adjustment, another thing worth complaining about. My unit came with 50mV on one channel so I decided to adjust it. But the offset trim pots are under the heatsink and the TK2050 needs to be sinked. So I had to remove the heatsink, adjust, hold the heatsink down, on the amplifier, repeat. And to top it off the values of the pot and resistor made huge swings possible - my first adjustment gave me >4V, small adjustments resulted in few hundred mVs. I got lucky in my final try to somehow got <10mV. But with such trouble to adjust offset, I can guess why it was not properly done before the unit was shipped.
Attachments
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This ain't gonna help
Ordered one of these for sub duty on a very modest ht setup nice boxed up solution... saw the comments on here and thought its going back to china as soon as it gets here (UK)..... not so HA HA! mine works great ! no probs at all!
long time fanboy of Tripath goodness and experienced (not all bad) with sure electronics products.Guess with Sure products it's a bit off lottery.. shame really with all the manufacturing tech and price point they can't get it right consistently.
cheers jon
Ordered one of these for sub duty on a very modest ht setup nice boxed up solution... saw the comments on here and thought its going back to china as soon as it gets here (UK)..... not so HA HA! mine works great ! no probs at all!
long time fanboy of Tripath goodness and experienced (not all bad) with sure electronics products.Guess with Sure products it's a bit off lottery.. shame really with all the manufacturing tech and price point they can't get it right consistently.
cheers jon
I've purchased that amplifier and it is on his way to my home already. I had alot of read about the 2*100 W sure board before the purchase and I was happy with it until now. Fooled myself thinking it had the sure 2x100 (AA-AB32181) inside
Any one else have this amp and is suffering with the bass problem wwenze described ?
I'm new to all that electronic stuff so I would like to ask you guys about that PT2314E .
Is that IC a real problem even with the fully working units of that amplifier ? That IC will permanently degrade the sound quality in any ways ? How bad ?
wwenze and Saarmichel
Any of you guys managed to solve the problems with this amp ?
Thank You all
Any one else have this amp and is suffering with the bass problem wwenze described ?
I'm new to all that electronic stuff so I would like to ask you guys about that PT2314E .
Is that IC a real problem even with the fully working units of that amplifier ? That IC will permanently degrade the sound quality in any ways ? How bad ?
wwenze and Saarmichel
Any of you guys managed to solve the problems with this amp ?
Thank You all
Wanted to do some measurements this weekend but forgot to bring the customized cables. 
In Sure's email reply to me, they claimed to have solved the problem by changing the polarity of one of the speaker outputs. Didn't really solve the bass problem I had. Makes me wonder if my case is one-off. Doesn't matter, already bypassed the volume control.
In Sure's email reply to me, they claimed to have solved the problem by changing the polarity of one of the speaker outputs. Didn't really solve the bass problem I had. Makes me wonder if my case is one-off. Doesn't matter, already bypassed the volume control.
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