StanleyB
21-03-2014, 08:43
Here is a reasonably simple mod for the Bushmaster MKI (TC-7530DC) that anyone with basic soldering skills should be able to manage. This mod improve the overall sound quality by quite a big margin, especially if you are using a linear PSU, sBooster, or batteries.
Sound wise it surpasses the Venom1 and 2 mods. Improvements to expect are:
Less glare, more detailed depth, better frequency response across the range.
This mod does not require the removal of the PCB from the case. All changes can be carried out with just the top cover of the Bushmaster removed.
http://www.homehifi.co.uk/images/mods/7530/7530%20op%20org.jpg
The standard output from the DAC chip has a filter network made up of R28/R29 and MLC20/MLC21 as shown above.
To carry out the mod, you need to do the following.
Replace surface mount resistors R28 and R29 with a couple of metal film or equivalent low noise resistors of 1/8 or 1/4 Watt, 120 Ohms. Cut the excess part of the legs on the resistors and solder them onto the PCB as shown. Make sure that you add enough solder so that the resistors don't come off.
Next, replace MLC20 and MLC21 with a 15nF WIMA cap with a leg spacing of 2.54mm. If you use one of these, you won't have to bend any legs on the caps.
http://www.homehifi.co.uk/images/mods/7530/V3.jpg
The mod improves the headphone output clarity as well. But an additional headphone mod will be posted to go with it.
A matching Firmware upgrade based on the code from the BMII has been ported over and made compatible with the BM MKI. Together with the above mod the TC-7530DC can be brought close to the BMII with the latest FW.
Anyone interested in the modded BMI firmware should email me for the price.
Sound wise it surpasses the Venom1 and 2 mods. Improvements to expect are:
Less glare, more detailed depth, better frequency response across the range.
This mod does not require the removal of the PCB from the case. All changes can be carried out with just the top cover of the Bushmaster removed.
http://www.homehifi.co.uk/images/mods/7530/7530%20op%20org.jpg
The standard output from the DAC chip has a filter network made up of R28/R29 and MLC20/MLC21 as shown above.
To carry out the mod, you need to do the following.
Replace surface mount resistors R28 and R29 with a couple of metal film or equivalent low noise resistors of 1/8 or 1/4 Watt, 120 Ohms. Cut the excess part of the legs on the resistors and solder them onto the PCB as shown. Make sure that you add enough solder so that the resistors don't come off.
Next, replace MLC20 and MLC21 with a 15nF WIMA cap with a leg spacing of 2.54mm. If you use one of these, you won't have to bend any legs on the caps.
http://www.homehifi.co.uk/images/mods/7530/V3.jpg
The mod improves the headphone output clarity as well. But an additional headphone mod will be posted to go with it.
A matching Firmware upgrade based on the code from the BMII has been ported over and made compatible with the BM MKI. Together with the above mod the TC-7530DC can be brought close to the BMII with the latest FW.
Anyone interested in the modded BMI firmware should email me for the price.