Build This MoFo!

[Michael Rothacher]

Thank's Michael do you still favour the IRFP250...

Well, it wouldn't be a fair comparison because I ran the hockey puck at 60V 4A with around one-fifth the distortion. I haven't logged a lot of listening time with that one yet.

 

[Dennis Hui]

Well, it wouldn't be a fair comparison because I ran the hockey puck at 60V 4A with around one-fifth the distortion. I haven't logged a lot of listening time with that one yet.

Hi Mike,

What inductor did you use for the hockey puck version?

Thanks,
Dennis

 

[Michael Rothacher]

Well, it wouldn't be a fair comparison because I ran the hockey puck at 60V 4A with around one-fifth the distortion. I haven't logged a lot of listening time with that one yet.

Sorry, I meant 36V 4A

The inductor in that case was a Hammond 100mH 5A. The part number escapes me at the moment. It's big.

 

[woody]

Hammon make a non shielded 5A 100mh choke the 195T5 . Depemding on who you buy it from it's about $90 give ot take a few dollars. And as Michael said it's big weighing 14lbs. I shure wish I had bought more than one when someone had them on Ebay for $35 including postage ....

 

[wtl]

Michael it would be good if DiyAudio store would stock the PCBs.

Fair call on the comparison between the hockey puck and IRFP250

I received 2 hammond 193v chokes from Digikey yesterday so will build with IRFP250 to start with.

Steve.

 

[Michael Rothacher]

I think you'll be perfectly happy with those.

 

[Michael Rothacher]

Michael it would be good if DiyAudio store would stock the PCBs.

Tell Variac.

 

[Dennis Hui]

I think you'll be perfectly happy with those.

Yeah...start with 193V/IRFP250 then go 195T5/hockey puck and recycle 193V in Vfet L'amp...

 

[Michael Rothacher]

Look what I got for my B-day!

The Dude would approve.

Mrs. R is a thoughtful lady.

 

[JPS64]

Happy B-Day!

JP

 

[Soundhappy]

Look what I got for my B-day!

The Dude would approve.

Mrs. R is a thoughtful lady.

Happy Birthday Michael
Nice for keeping You warm at BAF17
Please accept my virtual B-day gift is the hockey version

An externally hosted image should be here but it was not working when we last tested it.

 

[Michael Rothacher]

Thank you!

Our trip to California has been cancelled, so I'll be jonesing along with everyone else who can't go. Maybe we can form some sort of support group.

 

[wtl]

Michael i am sure i will be happy BUT!!!! I wonder how the MO-FO sounds with ???? and like most of us the urge to tinker is inevitable.
All the Best for your B-Day.

Steve.

 

[DougL]

I had a crazy thought.
Would cascoding the (Output) transistor potentially lower the distortion?

 

[dantwomey]

MR. Thanks for a great contribution that I can't wait to try!

DB120-20 AAVID THERMALLOY, Heat Sink, Square, For 80MM Power modules and Solid State Relays, 0.41 degC/W, 135 mm, 125 mm, 120 mm, Newark element14 Canada



Regards,
Dan

 

[dantwomey]

The following heatsinks worked famously when I built Michael's IronAmp!

NV115-1 AAVID THERMALLOY, Heat Sink, PCB, Board Level, 0.5 degC/W, 119.89 mm, 119.89 mm, 115 mm, Newark element14 Canada

 

[Soundhappy]

I built one with the IXFN44N80P.

I was playing with Big MoFo.
This one need nice front end and preamp with lots of gain.
Do IXYS version have better specifications versus IRFP ?
Dreaming about The Dude at BAF17

 

[Zen Mod]

good book

 

[Michael Rothacher]

I was playing with Big MoFo.
This one need nice front end and preamp with lots of gain.
Do IXYS version have better specifications versus IRFP ?
Dreaming about The Dude at BAF17

Well, the distortion was lower due mainly to the much higher bias, and the output impedance is a little lower. I haven't spent any time listening to it yet.

It's really just a case of me taking things to the extreme out of morbid curiosity and the pure fun of it. Whether it sounds better or not wasn't really the priority.

 

[Michael Rothacher]

good book

I'll have to check that one out.