JBL 8340A tear down

October 14th, 2016

Got 4 of these real cheap!

Crown CT8150 tear down photos

October 14th, 2016

Got this B-stock only US$400 cheap from Harman on-line shop.  Sound great for this amp!  125W x 8 channels.  Good for 7.1, bi-amp, tri-amp use for home theatre or home audio etc…

No fan and this is really high tech!  1000W for a 1U box!  This amp is good for studio use for quiet operation.  Only issue is that it has no network connection and cannot bridge the output channels.

BSS Blu-160 tear down photos

October 14th, 2016

Audient ID4 tear down photos + Presonus R65 monitor speaker

October 14th, 2016

The USB interface only use USB power to work!  AKM DAC and good OPA op-amp.  Xmos DSP for USB interface.  Sound better than Lexicon IO22 to me.  I use a Presonus R65 and it sounds very good for a recording system under window.

The ID input use a Jfet J112 from Fairchild.  The output use two pairs of  BC327 and BC337 to drive the output.

Its bigger brother ID14 and ID22 use burr brown ADDAC but this little brother only use the AKM parts.  Cheap and good for this price point USB interface.

Tektronix TDS1012B internal photo and firmware update

October 14th, 2016

I acquire this old scope cheap and found the firmware is still 22.01.  I need to find a small USB drive using CF card of 1GB before I can update the firmware to 22.16.

I do not like the design of the power supply as some regulators are without heatsink and also two of the heatsink is too small.  After operating it for 15 minutes in 30 degC room temperature, I can smell the hot air come out from the top of the scope.  I bit worry on the temperature of the heatsink and also it is very close to the E-cap which will speed up the aging effect!