Build This MoFo!

[Michael Rothacher]

It's a go. We're working out the logistics to sell the boards in the diyAudio store.

 

[wtl]

Well Done Michael count me in for a couple of pairs.

Steve.

 

[xrk971]

This preamp designed by AKSA might be useful as a MoFo driver.

http://www.diyaudio.com/forums/solid-state/314563-aksas-lender-preamp-40vpp-output.html#post5238003

 

[Dennis Hui]

It's a go. We're working out the logistics to sell the boards in the diyAudio store.

That's great news for those of us who can't make it to BA2017 .

Ordered some 193V...now have to get some power supplies...

 

[Michael Rothacher]

24VDC 5A POWER SUPPLY | All Electronics Corp.

I'm staying home, so we'll all have to hang out together and comiserate.

 

[Decker]

The Bride of Zen preamp has lots of gain. I eventually put a 2:1 step down transformer in front of the circuit to reduce what was too much gain for my system. But in stock form it might work with the MOFO.

 

[xrk971]

Michael,
I've used the very same (or same looking and same specs) with two in series to power my FW amps and they work very well. Less noise than linear trafos. If you pair them up with a 7amp DC to DC converter you can get up to 50vdc supply within same power rating minus efficiency loss.

I need to order the transformers from Mouser and I can start building. I have the above PSU bricks already, heatsinks, a bunch of IRFP240 and 150's. I also now have a Preamp that can drive 20v p-p for 6w rms with the following distortion profile predicted and measured.

 

[flg]

Not to take anything away from what's his name, or Mike but, I just wanna throw out the mfg. name Pathos...

 

[Sk8Ter]

Everybody is building?

But no one is writing down there thoughts on or compare too other amplifiers?

In your own words its sonic characteristics?



Thank you


Lawrence

 

[Zen Mod]

Not to take anything away from what's his name, or Mike but, I just wanna throw out the mfg. name Pathos...

look further back ........ much further

there are some worth mentioning , not modern makers of overpriced damnhotscorchingeurekathingies

 

[vdi_nenna]

My first electronics book had a class A amp in it with an inductor for a current source. I thought it was ancient at the time.

 

[Michael Rothacher]

Seriously, this is 1930's technology. No one is claiming originality, chill.

When someone starts a sentence with "Not to take anything away from Mike" I just smile.

 

[Zen Mod]

well , from Mighty Moi , nobody can take unnecessary stubborn use of LED string , in almost everything

 

[Michael Rothacher]

The ZM Voltage Reference (TM)

 

[vdi_nenna]

Mike, I don't think it makes a difference. It works.
I wish I understood what I was seeing at that time.

 

[flocchini]

Pass XP-10

Does the Pass XP-10 have sufficient "swing" to drive a MoFo?

Thanks

Bob

 

[Zen Mod]

if it can swing something as 20 to 30Vpp , then yes

 

[flocchini]

thanks ZM

specs say 7V SE and 15V Balanced - not sure if this is peak or rms or average

I think it then could then be 14V (2 x times peak),
2.8 x 7 =19.6 for RMS conversion or
7 x pi =approx 21 using 7 as average for SE

So I need to find out what does mean in the spec sheet

Best

Bob

 

[Zen Mod]

it usually means RMS

so 7V should be 19V8pp

I usually think in Vpp , able to convert to RMS , but anything in between is wooshy mushy for Moi

considering that MoFo is inductively loaded stage , means output voltage envelope is practically (almost) doubled PSU rail value ....... and being follower - you need input Vpp pretty much in same range as possible output swing

me likee all that copper/iron

 

[flocchini]

Thanks ZM