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Old 3rd December 2010, 02:19 PM   #101
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Quote:
Originally Posted by then_dude View Post
mmhh, i forgot about 41hz, i thought that arjen's amp were a little bit better.

i suspect you advice the amp 4 as better equivalent of the arjen ?

i wonder if the 41hz need any tweaks: that said i mean, the arjen and sure have an enormous amount of tweaks, maybe the 41hz doesn't need them.

thanks
Perhaps the Amp11 is most similar to Arjen's amps. The Amp4 is my personal favorite - the sound is amazing, but it's intended for 8 Ohm loads. (Can be tweaked and used with 4 though.)
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Old 3rd December 2010, 02:30 PM   #102
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thanks for the info.

i'm building speakers all the time, most of them are 8 ohms, but my next build might be 4.

how do you modify the amp 4 to 4 ohm ? is it difficult, pricey, and i suppose you end up with 15w ?

thanks
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Old 3rd December 2010, 02:31 PM   #103
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Quote:
Originally Posted by then_dude View Post
thanks for the info.

i'm building speakers all the time, most of them are 8 ohms, but my next build might be 4.

how do you modify the amp 4 to 4 ohm ? is it difficult, pricey, and i suppose you end up with 15w ?

thanks
You put in a STA517B output stage chip And you get quite good power. 60W or so I think?
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Old 7th December 2010, 03:10 AM   #104
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As soon as I mount the boards and power supply in a box I'll attempt to post some pics. The amp continues to improve with burn-in, sweet!
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Old 7th December 2010, 12:20 PM   #105
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Arjen's 2050 boards are available again...
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Old 9th December 2010, 07:34 PM   #106
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Is it normal when mounting the boards to an aluminum enclosure to make a short of the signal and power grounds? I used rubber grommets and machine screws to secure the boards to the enclosure but created a short to the battery PS. Removed the screws and everything is fine :^)
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Old 22nd December 2010, 08:02 AM   #107
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Default MKII TK2050 has been made

Dear comrades, ( been in china too long )

I have made some sample MKII TK2050 boards, and would like to show the photos.

i'd be happy to receive comments, new features include,

- speaker protection using the two IC's fault lines to disconnect the speakers with a larger relay
- 5V and 24V indicator lights
- even better layout
- 1.5CM shorter board
- same quality stuff like Elna caps and Micro-metal coresClick the image to open in full size.
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Old 22nd December 2010, 02:37 PM   #108
julcat is offline julcat  Mexico
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Hello Arjen

Looks good, what about the sound quality??
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Old 22nd December 2010, 04:19 PM   #109
juanito is offline juanito  Europe
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Quote:
Originally Posted by whaleman View Post
I could not wait...
I wanted to do a second 2050 without the tube buffer before Christ-mass, had to go with HifimeDIY. Arjen's 2050 sound fantastic.
...any comments about the comparison between TK2050 boards? first impresions?
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Old 22nd December 2010, 05:32 PM   #110
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Quote:
Originally Posted by ArjenShenzhen View Post
Dear comrades, ( been in china too long )

I have made some sample MKII TK2050 boards, and would like to show the photos.

i'd be happy to receive comments, new features include,

- speaker protection using the two IC's fault lines to disconnect the speakers with a larger relay
- 5V and 24V indicator lights
- even better layout
- 1.5CM shorter board
- same quality stuff like Elna caps and Micro-metal coresClick the image to open in full size.

Arjen, good to see you post again. Your 2050 V2 looks very nice. I like the fact that you used the Elna caps on it.

Only suggestion is that the Audiophiler input caps might be improved by a few dollars with the Dayton 3.3 uF polypropylene--like I did with your TA2020 MKIII (see pictures below). I replaced the input caps and the main filter cap with a Nichicon FW 10,000 uF. A little overkill maybe and it is a matter of taste.

Very nice product and I am sure I will order a set soon after I have some audio friends over to hear your 2050 with the tube buffer and a new set of Cathedrals. Up against it will be an LFD British Amp, and a Music Angel KT88 based tube amp. So far, the TA2020 MKIII held its own pace right behind the LFD on a shoot out (same LFD kind of amp but earlier version as the one reviewed in Jan. Stereophile)

Quote:
Originally Posted by juanito View Post
...any comments about the comparison between TK2050 boards? first impresions?
I plan to get started tonight, but really, I do not see how anything can beat my Helder 2050 with the Helder tube buffer. Wish I had waited. We will all see.

Pic of my Helder 2050 with tube buffer. Crowded inside since I did not plan to place all these components inside originally.
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