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gripracer 10th December 2009 05:23 PM

TK2050 Extremely successful modifications -- list, pics, review
With an input-cap-mod/24v battery TK2050 board, I was not impressed. Only the midrange was good. I switched back to my Gainclone.

With this fully-modded/24v battery TK2050, I will never use my Gainclone on my main system again. I would put my TK2050 up against the RWA Signature 30.2 ANY DAY OF THE WEEK.

I now own a truly ultra-fi amplifier. I have never heard anything like it. I will not bore you with terms like "liquid highs" -- it is simply the best amplifier I have ever heard.

Mod List:
Power: 2x12v 5ah SLA batteries, wired in series.
Input Stage: DACT-Style 10k stepped pot, 2.2uf 250v Aerovox AFPS input caps, C17 R14 C25 R34 Removed, Limiters (on the bottom of the RCA jacks) removed.
Output Stage: 10uH 68-1 Toroidal coils, .47uf 160v MKP10 differential-caps, .22uf 100v MKP2 common-caps. Low-pass is about 71Khz at 8ohm.

Supporting Mods:

-Tank capacitors changed to 2x 2200uf 35v Nichicon Fine Gold
-Tank bypass film caps changed to WIMA MKP2 .22uf 100v
-TC2000 chip capacitors changed to 100uf 35v Nichicon Fine Gold, 100uf 25v Muse KZ

Note: The output stage is just as important if not more so than the input stage. People generally upgrade their input stage first, as it's cheaper/easier, but the parts on your output filter are just as important!

Also, upgrade signal path parts first, then do power cap mods!

gripracer 10th December 2009 06:02 PM

Here's a good analogy of the sound. It's gone from, "does my amplifier have enough resolution to fill out the music?" to, "does this music contain enough detail to really make this amplifier shine?", and I'm not talking about compressed music -- only FLAC or better.

In other words, sometimes the MUSIC isn't good enough for the amplifier, not the other way around. That's pretty revolutionary to my ears.

e_fortier 10th December 2009 10:52 PM

Zobel + fan

Very nice work.

Did you add a Zobel..and if so which value did you use.

For the fan, just send a quick e-mail to Sureelectronics, they send me a free fan. Connected to 5Vdc you do not hear it but there is a slight motor boat sound when running, maybe a separate voltage reg would do the job.

My output filter is 22uH with 0.22uF for a fc of 73KHz, and diff cap is 0.1uF. The original common caps were 0.68uF giving you a fc of 41KHz..


gripracer 11th December 2009 12:05 AM

Thanks Eric. No, I did not put in a Zobel. If I did, I would have used 10ohm, .47uf.

Good idea about the seperate Vreg for the fan, 7805 implementations are not expensive.

And no wonder the top end was un-impressive. Some of the parts decisions that Sure made are kind of baffling to me after reading the Tripath data sheet.

sendler 11th December 2009 02:57 AM

Best amp indeed
Agreed. After some mods these are the best sounding amps I have ever had home. amazing for $50/ channel. You have obviously seen the other thread.
Did you remove the heat sink to change the rubber cement for some better thermal paste yet? That should help you to keep from overheating the chips without the added complexity of the fan. I want to change my fans for northbridge heat sinks to hear if it sounds any better even though I have a separate regulator so the fan doesn't have to share the critical 5v driver supply.

gripracer 11th December 2009 06:03 AM

Currently I'm not having any overheating problems. I just leave the top of my cigar box open and it has never overheated, even after hours of being on. If it does, I will add a 7805, caps, trafo and fan, and draw from the wall. Batteries for amp, wall for fan! Or maybe I'll just use some AS5 paste, like you suggested.

Do you know if the big thread has any comments on C29 C32 C37 C41?

sendler 11th December 2009 10:51 AM

Power supply

Originally Posted by gripracer (
Do you know if the big thread has any comments on C29 C32 C37 C41?

We haven't done much experimenting with the power supply filters yet. I'm still playing with the coils which are the key part. The Ferroxcube cores with 14ga wire sound amazing and are still small enough but the best model, TN26/11-3C20-A113 are hard to get even though they are featured in the Class D application note. Once I settle on the output filter, I will start playing with the power supply.

gripracer 11th December 2009 11:10 AM

oh, there are better-sounding coils than the arjenhelder 10uh?

audio1st 11th December 2009 11:13 AM

2 Attachment(s)
Nice work gripracer,
I'm running mine with 18ga Air Cores and a filter that sounded the best to me..

sendler 11th December 2009 03:00 PM

Better coils

Originally Posted by gripracer (
oh, there are better-sounding coils than the arjenhelder 10uh?

Yes. See the thread.

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