PPS, et. al. Mags, loads of mags. #! /bin/sh # Wed Feb 7 01:28:08 MST 2018 # grab the current PDFs of the R - Pastebin.com
Is there any alternative solution to avoid the usage (or to minimize) of the C2 electrolytic capacitor. As Nelson Pass said "No capacitors anywhere in the circuit...". Especially the electrolytics which killing the music.
The simplest way would be to use a single ended output transformer instead of the choke, but the cap sounds just fine to me.
3 options come to mind.
1. Use a 1:1 transformer instead of L1 and C2. It would require the same primary inductance.
2. Have a transformer wound with superconductor wire. Its the resistance of L1 that places the DC on the output. 😉
3. Find a different circuit that does not require a capacitor.
While there may be a way to make it DC coupled, it violates my simplicity esthetic.
Sorry for the silliness.
Big MoFo with M2 buffer
I believe ZM suggested that to get additional gain for the MoFo use the FE of the M2.
I inserted a M2 FE between the my XP10 and the Big MoFo. Gives me the gain I need and initial listening makes me want to continue listening (and experimenting)
Thanks all
Best
Bob
ZM - more from my heat sink collection - I like these and will use in my next ( and final ) amp 😉
I believe ZM suggested that to get additional gain for the MoFo use the FE of the M2.
I inserted a M2 FE between the my XP10 and the Big MoFo. Gives me the gain I need and initial listening makes me want to continue listening (and experimenting)
Thanks all
Best
Bob
ZM - more from my heat sink collection - I like these and will use in my next ( and final ) amp 😉
Attachments
Very nice Bob!
I am on the same path. Currently using Altec 15095As as autoformers in M2 style in front of my 12 volt MoFo. It is a very nice pairing.
Also, the B1 transformer that NP displayed at BAF is basically the same as the M2 front end.
I am on the same path. Currently using Altec 15095As as autoformers in M2 style in front of my 12 volt MoFo. It is a very nice pairing.
Also, the B1 transformer that NP displayed at BAF is basically the same as the M2 front end.
Can you analyze a little bit this for the beginners like us. What is FE of M2 & XP10 ?
The XP10 is a Pass Labs preamp - It has about 9-10 dB of gain.
The M2 FE in my case is the First Watt M2 with output taken after the !0uF cap. See schematic in the M2 thread.
Hope that helps.
Best
Bob
The M2 FE in my case is the First Watt M2 with output taken after the !0uF cap. See schematic in the M2 thread.
Hope that helps.
Best
Bob
I used the attached schematic which was posted by NP in the M2 thread.
I needed a bit more gain than my Pass Labs XP10 provided, The M2 front end has provided this for me. As pointed out this could also be done with B1 XFMR unit
On the Tea Bag M2 board I populated R1-R5, C1 and C2, Q3 and Q4 and the Edcor PC600.
Output was taken after C2
24V regulated was provided by a supply I had available.
Hope this helps
Nice soundstage both in width and depth. Very involving - makes you want to listen - good detail and female vocalists sound great
I needed a bit more gain than my Pass Labs XP10 provided, The M2 front end has provided this for me. As pointed out this could also be done with B1 XFMR unit
On the Tea Bag M2 board I populated R1-R5, C1 and C2, Q3 and Q4 and the Edcor PC600.
Output was taken after C2
24V regulated was provided by a supply I had available.
Hope this helps
Nice soundstage both in width and depth. Very involving - makes you want to listen - good detail and female vocalists sound great
Attachments
Mr. Rothacher mentioned that he got the heat sinks from Newark:
http://www.diyaudio.com/forums/pass-labs/313649-build-mofo-5.html#post5217931
Probably these ones:
http://www.newark.com/aavid-thermalloy/db120-20/heat-sink/dp/10WX1014
http://www.diyaudio.com/forums/pass-labs/313649-build-mofo-5.html#post5217931
Probably these ones:
http://www.newark.com/aavid-thermalloy/db120-20/heat-sink/dp/10WX1014
Is there a simple way to measure saturation current of a choke?
I have EI core autotransformer without gap, I would like to know the max DC current prior saturation to use as MoFo
I have EI core autotransformer without gap, I would like to know the max DC current prior saturation to use as MoFo
In this atricle we masure the choke at 120Hz AC current
will the saturation DC current be the same?
will the saturation DC current be the same?