Modifying Sure 4*100 watt TK2050
Posted 06 March 2012 - 12:37 PM
Since the whole thing cost me only 40 bucks I've decided to sacrifice it to some butchering type mods.
The output section on this amp is weird, consisting of a parallel LC combination which is basically a band stop filter and something like a zobel network across the terminals to address rising impedance.
I am considering two options.
First is bypassing the entire output filter stage and attempting to limit EMI by using simple clip on chokes on the speaker cables.
Second choice is to replace the existing filter with a more conventional B4 second order low pass filter with superior components and do away with the zobel network.
For the input section I simply intend to remove the high pass capacitors.
Naturally I don't expect these mods to improve distortion figure at high levels. I will at least expect a cleaner reproduction at normal levels.
Posted 06 March 2012 - 01:19 PM
Posted 06 March 2012 - 01:55 PM
Posted 06 March 2012 - 02:47 PM
Thanks for the link. Some of the comments for the suggested mods were not positive. I think a simple quality of parts upgrade might make a subtle difference - as long as it doesn't cost me as much as buying a better amp.
A Tripath amplifier is a class D amplifier and the output filter is essential in permitting only the de-coded audio signal to pass through and blocking the carrier(R.F) waveform from reaching the speakers.The speaker impedance is part of the filter equation and should be as required by the amplifier manufacturer's specification. Changing components as suggested appears to be a recipe for a poorer result.Perhaps a look at [url]http://www.diyaudio....050_2x100,might be worthwhile.
Posted 06 March 2012 - 02:47 PM
Posted 06 March 2012 - 03:04 PM
Posted 11 March 2012 - 08:11 AM
I will firstly tackle upgrading the zobel resistors and caps. I have attached a photo of zobel network.
Look at R1 and C1 , the zobel network. What on earth are those miniscule components going across a full speaker load? In my experience with crossover filters a very decent high powered metal film resistor and an MCAP are mandatory in this kind of network.
If anybody can recommend high quality MKT caps for input and output filters would be appreciated.
Will report back on Zobel upgrade.
Edited by georgepapa, 11 March 2012 - 08:23 AM.
Posted 11 March 2012 - 05:11 PM
Posted 12 March 2012 - 07:40 AM
Those zobel components look like the tantalum variety. I have gleaned from other forums that tantalum capacitors yield very high distortion at high voltage levels and are not recommended for audio.
They may LOOK like tantalums, but they are, mosty assuredly NOT tantalums. By all means replace them with different parts, but don't expect an appreciable difference. They will be some kind of film or monlythic cap.
You need to understand why the Tripath™ products were created, before you waste too much time on them. Tripath™ amps were created to:
* Deliver huge profits to the manufacturer.
* Make it possible for manufacturers to deliver reasonably priced amplification, in a compact package with decent MID-FI performance.
Tripath™ are fundamentally crippled, in comparison to decent quality audio amplifiers. It is not possible to acheive high end performance from them. In fact, I have always argued that better performance is possible from the decent quality chip amps from some of the linear amp manufacturers.
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Posted 14 March 2012 - 10:45 PM
Posted 15 March 2012 - 10:29 AM
I have read very positive reports of TK2050 based amps by Hifimediy and Virtue audio.
I have just ordered about 55$ worth of Vishay film caps and MO resistors from RS online feeling reasonably confident that a complete i/o parts swap to quality high powered components surely must make a discernible difference.
Posted 18 April 2012 - 01:13 PM