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Old 21st September 2009, 01:23 PM   #501
swkbkk is offline swkbkk  Thailand
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Sorry to hear about your misfortunes, ElFishi and SimonKit
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Old 21st September 2009, 02:13 PM   #502
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Originally Posted by swkbkk View Post
Sorry to hear about your misfortunes, ElFishi and SimonKit
Thanks, I hope to learn from it. Anyway, I upgraded 2 other amps (a gainclone and the Trends Audio TA-10) this weekend with the Mcaps from Mundorf I tried on this Sure Electronics amp because I like them very much! Next time I will be more careful with the PCB.
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Old 21st September 2009, 03:15 PM   #503
ElFishi is offline ElFishi  Europe
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Originally Posted by swkbkk View Post
Sorry to hear about your misfortunes, ElFishi and SimonKit
thx -
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Old 21st September 2009, 09:51 PM   #504
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Default Is there a Sure board hierarchy of suggested mods?

I would think that replacing the input caps to something like the Dayton poly foil caps is a good start for maximum improvement in sound quality for the least amount of work/money. I've gone through all the posts and have the glazed eyes to show for it. Is there anyone out there who might be more organized or knowledegable than me (I think: "yes"), someone who's willing to make a list of what might be the best upgrades for most DIYers? I'm thinking something along the lines of:
I. Must Do's: swap out input caps, upgrade signal path resistors, etc.
II. Worth Doing for Better Sound: swap out stock inductors for toroids, etc.
III. Might Be Worth Doing: battery PS
The above list is just an example, surely someone has a better idea . . .

Thanks!

Last edited by soldersmoker; 21st September 2009 at 09:55 PM.
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Old 21st September 2009, 09:54 PM   #505
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Default Volume Control, Bypassing It

If I want to just use the Sure board as an amp, and do not want to have a volume pot connected, is there a place on the board I should short out or leave open? I'd prefer to have my preamp control the volume and to have the amp not have a pot controlling resistance on the input.

Last edited by soldersmoker; 21st September 2009 at 09:56 PM.
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Old 22nd September 2009, 01:17 AM   #506
vaughn is offline vaughn  United States
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Anybody know where the 2.5V connection is on this board? I want to try a capacitorless connection from my transformer output DAC as Panomaniac describes in the transformer coupled DAC thread.
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Old 22nd September 2009, 06:09 AM   #507
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Quote:
Originally Posted by soldersmoker View Post
If I want to just use the Sure board as an amp, and do not want to have a volume pot connected, is there a place on the board I should short out or leave open? I'd prefer to have my preamp control the volume and to have the amp not have a pot controlling resistance on the input.
No problem. I used it this way combined connected to my passive preamp from Antique Sound Lab http://www.uhfmag.com/Issue62/aslpassive.html
There is nothing you have to change on the board ... however if you have an active pre-amp I would set the gain on the board of the Sure amp to the lowest setting with the dipswitches.
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Old 22nd September 2009, 06:29 AM   #508
ElFishi is offline ElFishi  Europe
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Quote:
Originally Posted by soldersmoker View Post
I. Must Do's: swap out input caps, upgrade signal path resistors, etc.
II. Worth Doing for Better Sound: swap out stock inductors for toroids, etc.
III. Might Be Worth Doing: battery PS
my take:

I.
- Input caps
- tank caps (and thus depending on your PSU also a soft start)
II.
- Input and feedback resistors
III.
- output filter incl. toroids
- voltage regulator
- re-route power rails on PCB and remove diodes (amp likes every bit of voltage)
IV. Might not be worth doing
- re-wiring pins 24 on both TP2050s to 21,22 (Vdd) instead of gnd
- exchange C22&27 for 470pF as per the TC2000 data sheet
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Old 22nd September 2009, 06:44 AM   #509
ElFishi is offline ElFishi  Europe
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Quote:
Originally Posted by vaughn View Post
Anybody know where the 2.5V connection is on this board? I want to try a capacitorless connection from my transformer output DAC as Panomaniac describes in the transformer coupled DAC thread.
There is no 2.5V connection. It is the virtual ground of the input opamp of the TC2000 fed with 5V supply voltage. Plus there are pots (R5&R26) to fine tune the 2.5V such that there is no output offset voltage.

There are people though who run tripath based amps capless:
http://www.diyaudio.com/forums/class-d/101344-tripath-input-coupling-caps-post1201831.html
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Old 22nd September 2009, 11:20 AM   #510
dr_vega is offline dr_vega  United States
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Quote:
Originally Posted by ElFishi View Post
my take:

I.
- Input caps
- tank caps (and thus depending on your PSU also a soft start)
II.
- Input and feedback resistors
III.
- output filter incl. toroids
- voltage regulator
- re-route power rails on PCB and remove diodes (amp likes every bit of voltage)
IV. Might not be worth doing
- re-wiring pins 24 on both TP2050s to 21,22 (Vdd) instead of gnd
- exchange C22&27 for 470pF as per the TC2000 data sheet
A very good list, ElFishi. I think I'd add the Zobel filter to group I or II, more for safety than sound quality.

-dr_vega
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