Justblairs Audio and Electronic's Pages

I was contacted recently from Gregory Wisniewski, a reader of the www.justblair.co.uk website.  He wanted to share some details of a project that he is quite rightly pleased with and I was more than happy to oblige.

Based on the Sure 2x100watt TK2050 amplifier. Greg has performed similar modifications as I described in my first impressions article.  In his own words:

“For the mods I basically followed what was on your site for the Sure T amps.

I removed the input filters C16, C17, R14 and the corresponding parts on the other channel. I also removed 2 transient voltage protector chips that were placed under the on board RCA jacks. I probably could of left these.

For input caps I used 2.2uf polypropylene Jantzen crosscaps. I was able to fit the leads into the same holes of the 0.22uf. caps that I removed. I am using the recommended 24volt PSU from Sure.

I liked the way you had cooling towers come up through the case of one of your projects so I thought I would try it.

The heat-sink, an Ainex HV-3747BL multi chip heat-sink  is similar to the Zalman ZM-NB47J but when I compared them at the store the one I decided to use had a full size base where Zalman indents there a bit. So I thought the non Zalman one would cover the 2 chips better.. I used Arctic Silver 5 grease for the heat-sink.

Originally the heat sink was 5mm lower in the case But I thought it would be good to have the heat-sink protrude a bit more out of the case. I now have the board on 15mm metal feet.  I have a blue led inside on the heat-sink.  The amplifier usually stays around 50 degree's so no problems  with the cooling.

The cases are from Takachi. They originally come with ABS plastic ends so I made my own from some brushed aluminium plate I had except for the back of the PSU case I used the original ABS end. The square hole for the heat-sink was cut with a table-top jigsaw.

The DC offset was near zero on one channel and 15mv on the other so I left that as is for now.

The sound is great! I have built 2 other T amps. But the Sure one using the mod directions from www.justblair.co.uk is definitely the best performing.”

I am certain that you will agree with me, Greg has made a great job of his Sure 2x100watt TK2050 amplifier, the casework is elegant and I am a sucker for the blue led lighting on the cooling stack… Not strictly required for top quality sound perhaps, but presentation counts as well!

I have obviously heard (and own) a very similar configuration of amplifier and can testify to the quality of the sound produced.  With looks and sound quality to match it is no wonder that Greg is pleased.

Feel free to contact me if you wish to see your own project featured on www.justblair.co.uk.