The DIY passive preamplifier is a spin-off project of my T-amp adventure. I was (and still am) so mesmerised by the sonic quality of my T-amp with full discrete parts and fitted with a 24-steps discreet Dale resistors attenuator which I find as much more transparent and natural sounding than even the SimAudio Moon i3 integrated amplifier in my main system. This led me to embark on the DIY project by copying and in the hope of attaining an equivalent performance from the Audio Synthesis Passion at just a fraction of its cost with use of a good quality attenuator, Teflon-insulated high purity (99.99%) silver internal wires, 4% silver solder lead, good quality connectors and an input switch. The DIY passive preamplifier is purely passive and has no gain but otherwise performs all the functions of a conventional preamplifier (it has 3 inputs) with minimal degradation to the delicate audio signal. However, just like the T-amp, it may not be everyone’s cup of tea as most people actually prefer active preamplifiers with more drive capability and dynamics. Nevertheless, if properly matched, any passive pre-amplifier is capable of producing a far more transparent and natural sound if it is compatible enough with other components of our system right from the source, cables and power amplifiers.
The Elma stepped attenuator fitted with Shinkoh resistors (http://www.hificollective.co.uk/components/shinkoh_stepped_attenuator.html) really stirred up the interest in me and I may opt to replace my existing unit with it. Read the description on sound through it from paragraph 5 onwards under 'Testing the Attenuator', an event, although to a lesser extent, that I have personally experienced before and could readily relate to.
An interesting read on passive pre-amps: http://www.rothwellaudioproducts.co.uk/html/the_truth_about_passive_pre-am.html
to be continued: the internal of the DIY passive preamplifier
4 comments:
looks very good, but I,m dying to read the gory details
JB
Loving it YC, sounds like you are too.
Thank you Justblair, will post my finding some time later as currently quite tied up with work commitments and newfound joy in my vinyl playback after some upgrades. Cheers.
Hi, congrats for your interesting blog. I am a very satisfied owner of a t-amp (trends ta 10.1) and I am looking for a suitable passive preamplifier. So, I would like to ask what are your experiences on this matter and especially if a passive preamplifier (such as yours or the popular Creek OBH 22) can drive the Trends TA. Also, what about the phono stage? We have the same (MF V-LPS). Does it have enough gain? Thanx!
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