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Old 22nd October 2011, 07:48 AM   #1
niekos is offline niekos  Netherlands
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Default Improving Topping TP 22

I bought a topping tp 22, based on the TK2050. It sounds ok, quite for such a litte amp. But I think/guess that it could be improved.
I read some stories about improving tp20/tp21 by changing caps in input/output circuit, but I am not sure which ones I should alter in this case.
Could anyone indicate which caps I can alter, also which kind of caps and values?
A picture of the board:
Click the image to open in full size.
Thanks in advance!
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Old 27th October 2011, 07:59 PM   #2
niekos is offline niekos  Netherlands
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Nobody any ideas? Another question then: the current power supply is 20v 3a smps, would more amps be benificial? I have a 19.5v 5a smps, but i am not sure it would work/make a difference?
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Old 28th October 2011, 09:16 PM   #3
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im sure a change of input coupling caps would make an improvement.i have no idea which caps are the input caps on that for your 5a power supply just try change can improve sound.just be sure you have the polarity correct.

Last edited by pharoahra; 28th October 2011 at 09:32 PM.
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Old 30th October 2011, 01:32 PM   #4
niekos is offline niekos  Netherlands
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I will try the diffrent power supply, who knows what the effect might be.
For the caps: I will read some more to find out if I can determine which caps to improve/replace.
I see a 317 on the board, and some caps there, replacing these with higher values could be a start.
How do I know what value I could try?
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Old 8th November 2011, 01:06 AM   #5
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Speaking as a former electronics technician and designer, none of the mods you are proposing will have any audible effect.

The power requirement (power = volts x amps) is determined by how loud the volume is and the speaker impedance (4 ohm requires more current). You could supply a higher voltage, but only at the risk of exceeding the components' design limits - seriously not recommended.

Changing the input coupling capacitor is highly unlikely to make any difference. Its value will have been chosen according to the input impedance of the op amp and any resistive load in parallel with that. It could possibly improve the bass response to have a higher value, but only if the designer couldn't use a calculator to save himself and chose a ridiculously low value to start with. Not very likely.

Best to just enjoy the music, or if you want to change the 'sound' - change your speakers, which being electromechanical are the source of all kinds of sound colouration and distortion.
NAD C730, NAD C541i, Denon DR-M14HX, NextWave DAB-390; NAD 7100, NAD 5000; Rega (clamshell): Mira II, Planet II, Radio R.
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Old 12th November 2011, 09:03 AM   #6
niekos is offline niekos  Netherlands
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Ok, seems there is not much to do then with this amp. I read a lot of articles where caps were replaced to have a better bass.
When I compare this amp to my yaqin-mc10l it sounds thin, clear, but less "fat".
The soundstage is also more flat, so switched back to the tubes amp after a while. Still love it
I did try the other powersupply, that did not make any difference.
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Old 29th November 2011, 03:30 PM   #7
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@niekos, which power supply did you use?

I wan't to upgrade the power supply, and wan't to know if I can use 30V, like in other tk2050 boards.

Any recommended power supply kit for the tp22?

I assume I can change the sound by upgrading the power supply.
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Old 6th January 2012, 03:12 PM   #8
niekos is offline niekos  Netherlands
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I tried a 19,5 V 4.6 A (from dell laptop) power supply I had lying around. It did not have any effect in my case.
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Old 20th January 2014, 03:34 PM   #9
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4A is enough for 20V,

* You can have some gain in power changing for an 25-27V (6A+) PSU. I wouldn't go anything higher than that. Heat sink is too small, and some capacitors are rated 25V. They might be for TC2000 5V feed anyway, but I'm not sure which layout topping has implemented. Anyway some circuits are projected for use with 20v like the Speaker relay, protection circuits, input gain... 25-27V max is ok. Connexelectronic has a great PSU with 28V and 10A, SMPS 300R.

They use almost same kind of capacitors for everything ranging from 25-50V.

* Anyway I guess both yellow in the middle (220uF 50/35V) are for VCC output bypass with is fine. You can change them for a higher grade one like Nichicon KZ/FG/KA/KW. Range from 35-63V, You will need something with 10mm max Diameter and 20mm high.

* I think both 47uF /50V are for feeding the 5V regulator with the VCC, I would use 100uF from 35-63V. Some ELNA Silmic II, Cerafine or Nichicon KZ/FG/KW or KA would be great. Mas 8 x 20mm

* The big 330uF /25V blue Panasonics are probably for VCC Supply to TP2050, and you obviously want bigger caps and higher rated there. Try something from 470-1000uF 35/50V from ELNA Silmic II, Cerafine or Nichicon KZ/FG/KA or KW.

* Them change all the small 5mm 220 and 100uF 25V capacitors for same capacitance but Nichicon KA or KW and rated 35 - 50V.

* Them change the stock MKT input caps for some Wima MKP10 2.2UF 250V.

You will have a much better amp them.

Not an expensive deal also.
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Old 4th July 2014, 12:41 PM   #10
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Hi !
Sorry if iīm off topic ; I own a pair of B&W 602(S2) which i use basically for mixing and mastering in a well treated room at moderate levels. I bought an used Rotel 970 amp but I donīt think itīs a clean amp (or it has something to do with the "age" - 1994, maybe, I donīt know).

Would be this Topping TP22 a good choice in my case?

Thanks a lot!


Last edited by Purest form; 4th July 2014 at 01:08 PM.
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