[markC]

Here's a shot of the latest mod to my Dac-60.
After many attempts to get the high end extension and dynamics I was after, this is by far the best effort to date. The purists may balk at using an opamp vs. a resistor for I/V conversion, but I got to thinking why The creator of the pcm 1704 specified this. Burr Brown even goes so far as to say it is critical to choose the apropriate -opamp- for optimal dynamic performance from the 1704.

[TomW16]

Hi Mark,

I read your efforts of modding the DAC-60 this past spring/summer and it sounds like you're "there"..... for now It never ends does it?  I have a Pacific Valve modified DAC-60 and am interested to hear what your final mods were and if there were any surface mount modifications.

I won't have time until after my basement is finished but I would eventually like to modify my DAC further.

Thanks.

Tom

[markC]

It never ending is all part of the sickness, er, hobby.
Haven't done any surface mount mods.
IMO, the mods with the most return for investment are coupling caps and tubes, (easiest), low pass filter and active I/V conversion.
I'm going to try a different pair of coulping caps and pretty up the wires to the I/V board. Hopefully, after that, I'll be done...for now. Exept for more tube rolling.

[TomW16]

I put a matched pair of Amperex JAN tubes (green writing) in my DAC-60 and it improved the sound quite a bit over the stock tesla tubes.  I now know why people like tube rolling so much.  You can really modify the sound to your taste.

Cheers,
Tom

[markC]

In my system, Amperex 6922's, (Orange Globe U.S.A), were a step above the stock Sovtek's, Jan Philips and even vintage Philips Heerlen made 6922 S.Q's. Most evident is palpability in vocals.
I'd like to try Amperex white label U.S 6922. I also have a pair of 7dj8's from a fellow member here, that I will plug in and listen to once I find time.