Fantastic build, @stablgr! That steel can surrounding the toroidal transformer is extra sweet. Do I see a 115VAC / 230VAC selector switch below the IEC inlet in photo 2? Wow!
Black Forest Buffer
So I hope Mark wouldn't mind.
4 Transistors, 6 resistors, JFET input.
Very low noise, very low distortion; all discrete, pure class A.
All active (Toshiba audio) parts, no unobtanium.
Total component cost << 10USD.
Cheers,
Patrick
.
So I hope Mark wouldn't mind.
4 Transistors, 6 resistors, JFET input.
Very low noise, very low distortion; all discrete, pure class A.
All active (Toshiba audio) parts, no unobtanium.
Total component cost << 10USD.
Cheers,
Patrick
.
Hi Mark. Thanks for the very kind words. I'm really getting into this hobby. I was really pleased with the way both the preamp and the M2X have turned out. The M2X is dead quiet. Not a trace of hum at full volume with inputs shorted. I did build a couple of shrouds for the edcor transformers from plasticard covered in coper foil and MuMetal just in case, but it has turned out to be unnecessary. The selector switch was added in case I ever take it back to the UK. Seemed a lot easier to make the effort of including the switch now than the hassle of rewiring later.
It's only been running for a few hours (currently with Austin boards) but is sounding fantastic. Thanks so much for all your work on this.
Gary
It's only been running for a few hours (currently with Austin boards) but is sounding fantastic. Thanks so much for all your work on this.
Gary
Be sure to try it with one of the fancier ultra-low-Zout daughter cards: Norwood or IPS7. People seem to really love what they do.
Hello,
I have 15 sets of 2 pieces of the Cedarburg to distribute.
Order my first attempt at allpcb.com and the new IPS8 boards came in handy:
Price:
3.5 euros shipping plus 2 euros for 2 boards
Within EU: 5.5 € / 6.65 dollars
Outside the EU: 6 € / 7.26 dollars
Greetings
Martin B.
I have 15 sets of 2 pieces of the Cedarburg to distribute.
Order my first attempt at allpcb.com and the new IPS8 boards came in handy:
Price:
3.5 euros shipping plus 2 euros for 2 boards
Within EU: 5.5 € / 6.65 dollars
Outside the EU: 6 € / 7.26 dollars
Greetings
Martin B.
Attachments
Hi Martin, I'd love a pair of boards as I've just completed my M2X. Is there a wait list for them? I'm based in the US.
Thanks,
Gary
Thanks,
Gary
we can try it to US [how long it takes].
I'll get the first part of ml to the post office tomorrow morning
I'll get the first part of ml to the post office tomorrow morning
Thanks Martin. Payment and PM sent. No worries on the shipping time. It will get here when it gets here. I've plenty of other little projects to keep me busy until it arrives.
Many thanks,
Gary
Many thanks,
Gary
Great job!
The advise to run it for a week with the current daughter boards is a a great one.
I did not use Mu Metal shielding as well.
In my system, I have been rotating Norwood, IPS7, and Austin. Mark J did an excellent job with the buffer cards and sounds magical to me. Ishikawa is the "start point" for me and base my impressions of the others from what I remember listening to it (closest sound to tubes in my system).
Remember let it warm up and check offset after replacing the cards. Enjoy your amp, it just gets better from here on.
The advise to run it for a week with the current daughter boards is a a great one.
I did not use Mu Metal shielding as well.
In my system, I have been rotating Norwood, IPS7, and Austin. Mark J did an excellent job with the buffer cards and sounds magical to me. Ishikawa is the "start point" for me and base my impressions of the others from what I remember listening to it (closest sound to tubes in my system).
Remember let it warm up and check offset after replacing the cards. Enjoy your amp, it just gets better from here on.
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> Can you elaborate, please, on the choice of BJT?
You mean why I use BJT, or why I choose TTA004B ?
Patrick
You mean why I use BJT, or why I choose TTA004B ?
Patrick
Although laterals are next to unobtainium, I like them a lot.
And they do not need source degeneration for bias stability.
C1, C2 are not a must.
You can probably still find some from reliable suppliers.
Patrick
.
And they do not need source degeneration for bias stability.
C1, C2 are not a must.
You can probably still find some from reliable suppliers.
Patrick
.
Because I like Toshiba transistors.
And I have hundreds of them (TTA004, TTC004) in my drawer, all matched.
😉
Patrick
And I have hundreds of them (TTA004, TTC004) in my drawer, all matched.
😉
Patrick
So that I have them ready when I want to try something. 😉
But that is irrelevant here.
Patrick
But that is irrelevant here.
Patrick