Improving Topping TP 22

niekos · 22nd October 2011, 07:48 AM

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:

Thanks in advance!

niekos · 27th October 2011, 07:59 PM

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?

pharoahra · 09:32 PM

im sure a change of input coupling caps would make an improvement.i have no idea which caps are the input caps on that model.as for your 5a power supply just try it.supply change can improve sound.just be sure you have the polarity correct.

niekos · 30th October 2011, 01:32 PM

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?

mashley_nad · 8th November 2011, 01:06 AM

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.

niekos · 12th November 2011, 09:03 AM

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.

rastanplan · 29th November 2011, 03:30 PM

@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.

niekos · 6th January 2012, 03:12 PM

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.

22nd October 2011, 07:48 AM	#1
niekos diyAudio Member Join Date: Oct 2011 Location: Houten, The Netherlands	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: Thanks in advance!

28th October 2011, 09:16 PM	#3
pharoahra diyAudio Member Join Date: Sep 2008	im sure a change of input coupling caps would make an improvement.i have no idea which caps are the input caps on that model.as for your 5a power supply just try it.supply change can improve sound.just be sure you have the polarity correct. Last edited by pharoahra; 28th October 2011 at 09:32 PM.

8th November 2011, 01:06 AM	#5
mashley_nad diyAudio Member Join Date: Apr 2009	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, C541i; 7100, 5000; Rega (clamshell): Mira, Planet, Radio R; Denon: DR-M14HX

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27th October 2011, 07:59 PM	#2
niekos diyAudio Member Join Date: Oct 2011 Location: Houten, The Netherlands	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?

30th October 2011, 01:32 PM	#4
niekos diyAudio Member Join Date: Oct 2011 Location: Houten, The Netherlands	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?

12th November 2011, 09:03 AM	#6
niekos diyAudio Member Join Date: Oct 2011 Location: Houten, The Netherlands	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.

29th November 2011, 03:30 PM	#7
rastanplan diyAudio Member Join Date: Oct 2011	@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.

6th January 2012, 03:12 PM	#8
niekos diyAudio Member Join Date: Oct 2011 Location: Houten, The Netherlands	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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