Sure Electronics New Tripath Board tc2000+tp2050

[teamacc]

I dont know if any of you guys have the same problem, but when I listen to "bring me to life" by evanescence, the bass in the intro of the song seems misplaced. Its not the record, but it might be the speakers OR it might be the amp.
Running a 2.5-way B&W set. (seems like the tweeter and the woofer are out of phase, or dont mix that well together)
Other songs sound great.

[Drakmin]

Originally Posted by v-bro

Did you dummyload the other channel? These amps don't really like being run "open loop"...

Also, I said it before, fans output EMI, often a substantial amount and I would do anything to remove it. It would be the first thing I would mod. It should also not be necessary to have it, all TK2050 amps I have built (up to 50Vdc!) don't need employment of a fan at all.

Either that heatsink is too small or the output filter is not working properly....or both....(probably both...)

I ran the amp only one speaker connected since I don't know what a dummyload is. About the fan I remove it now. Maybe 2x100 requires a fan but I need max 1x40 so my heat prodction should be less than a fourth?

[Barbieboy]

Originally Posted by teamacc

I dont know if any of you guys have the same problem, but when I listen to "bring me to life" by evanescence, the bass in the intro of the song seems misplaced. Its not the record, but it might be the speakers OR it might be the amp.
Running a 2.5-way B&W set. (seems like the tweeter and the woofer are out of phase, or dont mix that well together)
Other songs sound great.

Very interesting to read this as its the same for me too, but its with all music, except one CD ! I can not put my finger on why, but things just sound 'odd' and with a hole in the mid-range (most noticeable with vocals). I have checked the wiring many times and all is fine.....

[teamacc]

Originally Posted by teamacc

I dont know if any of you guys have the same problem, but when I listen to "bring me to life" by evanescence, the bass in the intro of the song seems misplaced. Its not the record, but it might be the speakers OR it might be the amp.
Running a 2.5-way B&W set. (seems like the tweeter and the woofer are out of phase, or dont mix that well together)
Other songs sound great.

Its in the speakers.
The passive woofer (.5) is causing some distortion of some kind, as it kinda laggs behind the normal woofer.
The tweeter and the amp are fine

[O2Free]

Thank you Dr_Vega. Putting extra tank caps under the board makes sense. Those are some big *** inductors. Did you try winding air toroids? Not that they are any smaller. I'm going with the Arjen coils for now, and have some Wurths on back order. There is someone selling 5A T-amp coils on ebay and they will match them to 1%. Choke coil for class-D T-Amp 10uH 5A - eBay (item 270558842628 end time May-05-10 06:35:43 PDT)

Regards,
Free

[dr_vega]

Originally Posted by O2Free

Thank you Dr_Vega. Putting extra tank caps under the board makes sense. Those are some big *** inductors. Did you try winding air toroids? Not that they are any smaller. I'm going with the Arjen coils for now, and have some Wurths on back order. There is someone selling 5A T-amp coils on ebay and they will match them to 1%. Choke coil for class-D T-Amp 10uH 5A - eBay (item 270558842628 end time May-05-10 06:35:43 PDT)

Regards,
Free

I didn't try to wind air torroids, they would be larger and use a lot more wire. Scott (sendler) has posted pictures in this thread of his air torroids.

Arjen's coils are much better than stock. The air coils are that much better than the Arjens. Scott says the Wurths are as good as the air-coils. I haven't heard them, so I can't comment except to say that I value Scott's judgement.

-dr_vega

[thierry38efd]

Hello,

i think trying another air toroid is a mistake,the wiring out the board can not provide good results,i've try to build UCD clone,the layout was the basic error.

otherwise:

for the tk2050,

noise is comming from the fan ,it's obvious
the best and easy way is to connect the fan ground dirctely to the 0 V supply.to avoid common impedance.

when the kit comes,we can easily transform the heatsink.
there is another heatsink whith a fan,i've screwed it with the another (without the fans )

i'm still listening whith it,temp is about 45° with 25° ambient temp.

very good amp for the price.

[Barbieboy]

Originally Posted by srinath

well I managed to confuse myself even further.
I bought a 3886 with 6N11 tube buffer and I need 26 0 -26 dc as well as 6.3 to 8 V ac in another location.
So how do go about getting a power supply for it, or I need 2 power supply's.
Thanks.
Srinath.

How is the tube buffer going ? Be interested to hear what you think of it. I have recently sold my Musical Fedelity X10D (Mk 1), had it since new from the early 90's, it use to sound wonderful back then but not now (unless my hearing has gone to pot*). I replaced the valves, but the magic was no longer there and sold it.

There are plenty on ebay to be had, even fully made are reasonably priced. Any ideas which sound best ?

tube buffer, Consumer Electronics, Tube Amplifiers, Preamplifiers items at low prices on eBay.co.uk

[Barbieboy]

Originally Posted by lbstyling

when runing my setup at over 25v on the meanwell 24v, it just sounded how i would have previously expected class d to sound- a little harsh all round.

i have no idea why realy, maby its running components above there ideal voltage inside the smps, maby the chip prefers lower voltage, maby its the reduced ampage available, maby its just mine!

Ok, I have got round to playing around with the voltage setting, and you are absolutely right. Its verging on horrid when turned up that 10%, turning it back to 24v the sound is so much smoother and three dimensional, the bass weight has returned too !

I think I am correct in saying that efficient speakers need lots of volts and inefficient (and normal) ones love plenty of amperage.

[sendler]

Originally Posted by Barbieboy

Ok, I have got round to playing around with the voltage setting, and you are absolutely right. Its verging on horrid when turned up that 10%, turning it back to 24v the sound is so much smoother and three dimensional, the bass weight has returned too !

I think I am correct in saying that efficient speakers need lots of volts and inefficient (and normal) ones love plenty of amperage.

The impaired sound quality at 25v must be related to turning the adjuster of the power supply to a higher setting than the nominal 24v design spec, rather than because of the 25v value of the voltage it's self. I am running a 36v supply turned down to 32v with fantastic results so voltages higher than 24v can still sound great. Running on two car batteries at 25.2v is slightly better than the SMPS but I believe that is because of the cleaner, 100ah battery power and in spite of the lower voltage. This may be answering a question I had asked earlier in the thread as it seems that turning a 36v supply down to 32v will be better than turning a 27v supply up to 32v. If I get time (next winter?) I could try modding the feedback resistors to optimize the amp for 36v to compare against a 32v amp to see if the supplies are really at their best only when adjusted dead on to the rated voltage or if turning them down is still just as good.