step one - open the housing
step two - do all mods (short summary)
step three - done
haven't received a feedback from shikada-san up to now if he is willing to offer me the second internal tube power supply pcb and if it is possible to get the also wider housing.
but spent a lot of time today in selecting components:
- +-0.1dB highend stereo potentiometer (not pure alps, a modified and exclusively for a german company manufactured one, about 120 euros):
the potentiometer above has the also main benefit of beeing smaller than the original one and space is the limiting factor for the modification.
input selector switch optimized for audio signals ( about 40 euros):
recableling - mundorf pure 97% silver and 3% gold wires (about 20 euros per meter), soundwise slightly on the brighter side, but very spacious, precise, great imaging and soundstage, less bass weight, great texture (if you believe what the reviews say) have to think of, but have the feeling that for the signal part i will go the silver way:
soldering - mundorf solder with 8.8% silver and 3% gold (about 100 euros 100 grams):
selecting the components is very important i think because everything has to be passive, no relay input switch for example needing lots of current, so the passive input switch has to be of supreme quality. also the potentiometer is available with motor drive, but the remote control logic needs up to 200mA to drive the motor.
power supply - buffer capacitor (about 35 euros):
This is a great new capacitor design, as the capacitor has input AND output wires, so beeing always charged from one side and delivering the power on the other side, avoiding problems with mixing charging current and used current.
i will definetely extract the charger logic of two car chargers and then making a much more stable external power supply with two of this capacitors.
i already bought some mu metal (permalloy) to shield the different parts of the amp (about 20 euros):
the only problem with permalloy is that after bending it has lost its ability to shield magnetic fields and must be heated to 1200 degres celsius to get this ability again.
i also want to buy ready to use boxes to shield the output transformers, but did not look for a german source up to now:
also there is the option to paint this parts with black color, so if there is not enough space in even the larger tu-05 housing, i will use such mu metal boxes to extend the housing and externally mount output transformers, neutrik jacks etc. .
as posted before, these are the vu meters (about 25 euros if bought in germany per piece):
this is the vu meters inferface logic (about 15 euros if bought in germany):
cinch (5 euros a pair):
loudspeakers (8 euros a pair):
additional switches, not finally selected, something like this (about 4 euros):
dac - hrt microstreamer 24bit 96kHz usb and usb powered dac with line out(about 180 euros, to compare size here with dragonfly usb dac):
P.S. btw, i now use one of my netbooks to post when at home, makes posting much easier than with my tablet.
Edited by GermanGuy - 9/17/13 at 2:32am