LuDEF P

[Zen Mod]

Second installment of Plethora of Pinjatas series of amps

Started with this

 

[Zen Mod]

which is

 

[Zen Mod]

that gone to T-Bed

 

[Zen Mod]

rails +/-23-ish
Iq 1A7-ish
output DC Offset negligible
LU1014 Uds set to 2V4

BFR (Beauty Factor Resistor) 22R, so OLG max.

thinking to make MC pre of this one

result, Pinpoint Machine - dominant 3rd

set of graphs for 8R Load:

 

[Zen Mod]

everything the same;

set of graphs for 4R Load

 

[Zen Mod]

OK, THD levels are ridicolous

But, as intention wasn't dominant 3rd, finally to use BFR position for Sugar Level Tweaking

BFR changed to 270R (OLG goes down, amount of NFB goes down, degree of symmetry between phases (LTP) goes down)

 

[Zen Mod]

so, to repeat:

rails +/-23-ish
Iq 1A7-ish
output DC Offset negligible
LU1014 Uds set to 2V4

BFR (Beauty Factor Resistor) 270R

result - Pinpoint Sugar Machine, dominant 2nd, THD Levels still ridiculously low

set of graphs for 8R Load:

 

[Zen Mod]

everything the same;

set of graphs for 4R Load

 

[Zen Mod]

Show Time

 

[Zen Mod]

Signal Path and Block schm more or less same as in SissySIT P

active links

How it sounds?

Spooky

 

[Zen Mod]

I've just learned that with new board software, now we can edit attachments in opening post



added parts placement pic

 

[lydlaug]

Wow...

How could I miss this thred???!!?
How will you describe the difference in sound between LuDEF P vs LuDEF?
Will you suply PCBs or the gerber for this?

RGDS
Lydlaug

​

 

[Zen Mod]

as Pa use to say - mine is to make them not to choose between them

but let me try ......... comparing to LuDEF .......... more of everything ........ even if little less spicy

now, imagine seeing Sophia and Marcello together on the screen ......... that level of easiness, no caring about the sound, just music

me, being modest as always***




***all me amps are like that, lucky copycat

aha, almost forgot - I did forgot to post Trade threads for latest amps, will do that in few days

3 of them, already !?!

SissySIT P, Ludef P, Plethora of Pinjatas ........

 

[August]

oh boy. This time I would like a cheap and easy amp as Lu were cheap to get. See if I can find some good solution surplus/ heatsinks for it or repurpose my existing ACA chassis.

 

[lydlaug]

Hi, Zen Mod.

What happened in this thread?
Did you complete the project and develop any PCBs for sale?

Regards

​

 

[Zen Mod]

send me an e-mail to >zenmodiyaudio@google.com<

everything is completed, ZM just being lazy with Trade threads

much more fun investing time in making new ones, than selling old ones

 

[Dan K]

Perhaps a silly question, but as I'm still halfway through mu luDEF build...

Can a luDEF be converted to a LuDEF-P? Would I want to?

thanks

 

[Zen Mod]

difference is just in FE

non-P is having autoformer FE, while P is having active FE

as everything exists and almost anything can be converted in something else, LuDEF can be converted to LuDEF P and vice-versa

though, easiest way for doing that is just taking proper set of pcbs and associated parts from drawer

just compare schms in post #1 here and post #1 here: https://www.diyaudio.com/community/threads/ludef.369990/