Babelfish M25 R.2/SET amp

[Botte]

DiAna will show you the wigglywiggly residual.

DiAna

 

[Zen Mod]

DiAna will show you the wigglywiggly residual.

DiAna

I know

but - as far as I got it, you need two functional channels ........ which I don't have

and lazy to have

I'll buy new external scard, before I even investigate what is wrong with EMU - is it Lin or Lout, OP or muting JFet

🙂

 

[Botte]

You don't need two channels. Just change from ARTA to DiAna and run with the same setup.

 

[marconi118]

Yes I saw 600:600 in your schema and then saw the M2X schema with a 600:15K connected a bit differently (smaller primary winding, bigger secondary winding maybe to achieve the same gain?)
What would be the best solution?
of course it depends on the output impedance of the input buffer, input impedance of the output stage and desired gain.

 

[Zen Mod]

well, dunno what proper answer is ....... 🙂

my thingie is routed for Edcor 600:600

both Edcor 600:600 and Edcor 600:15K are good xformers

use Cinemag, then no need to worry about difference between two Edcors

 

[marconi118]

Papa uses PC600:15K in the M2

difficult to choose the right one

 

[Zen Mod]

I tried them all, and it is not difficult to choose from

it was just matter how many different xformers I could squeeze in same pcb space, so Greedy Boyz can choose which one they prefer

and then, 4 of them ...... no way, must stay with 3 max, so I did chose between two Edcors with same footprint

regarding gain, there is really not much difference between 4V/V and 5V/V

btw. regarding choices - are you aware of number of decisions/choices/compromises, made to point when amp schm is done?

then same question for process of producing/finishing pcb file?

asking that, just to show you proper way of analysis:

- some things are trivial, you need to trust in constructor choice
- some other things, even if same trivial or less trivial - ask about them, and there is some meat you can learn from

 

[indra1]

LTSpice sez neg

I think LTSpice XVII report is weird. 😱 Phase of H2 on inverting circuit is correct, but shows negative when it is actually positive on non inverting circuits. You can actualy plot distortion residual in sim using jcx attachment at Spice simulation thread post#361 to confirm.

 

[Zen Mod]

tnx Mighty Indra

never too old to dig new bone

🙂

 

[Zen Mod]

did it

so, Mighty Indra, what's this wigglygiggly sayin to ya?

🙂

 

[indra1]

It's positive phase H2 with H2/H3 a bit better than 25 dB?

 

[Zen Mod]

It's positive phase H2 with H2/H3 a bit better than 25 dB?

sorry, it was not 1W@8R sine

here it is

Harmonic	Frequency	 Fourier 	Normalized	 Phase  	Normalized
 Number 	  [Hz]   	Component	 Component	[degree]	Phase [deg]
    1   	1.000e+03	3.907e+00	1.000e+00	   -0.08°	    0.00°
    2   	2.000e+03	4.110e-03	1.052e-03	  -89.55°	  -89.48°
    3   	3.000e+03	5.531e-04	1.416e-04	    7.76°	    7.84°
    4   	4.000e+03	7.575e-05	1.939e-05	   95.27°	   95.35°
    5   	5.000e+03	1.135e-05	2.904e-06	 -169.58°	 -169.50°
    6   	6.000e+03	1.458e-06	3.732e-07	 -100.81°	 -100.74°
    7   	7.000e+03	2.688e-07	6.880e-08	  167.90°	  167.98°
    8   	8.000e+03	4.094e-07	1.048e-07	  177.92°	  178.00°
    9   	9.000e+03	3.654e-07	9.352e-08	 -179.88°	 -179.80°
   10   	1.000e+04	3.212e-07	8.221e-08	  179.45°	  179.53°
Total Harmonic Distortion: 0.106159%(0.106160%)

my brain in this moment not set at analyse of wigglygiggly ( never really stopped enough to understand Papa's explanation of his pics) and especially let that issue down the river, when I read Pa's claim that you can flip it with simple overall phase flip

so, I'll trust you , whatever you say about phase 🙂

 

[indra1]

Papa showed in p4 of art_diy_nutube_preamp.pdf.

 

[marconi118]

DiAna will show you the wigglywiggly residual.

DiAna

do you have the password to unzip DiAna?

 

[Botte]

DiAna, a software Distortion Analyzer
See above

 

[Zen Mod]

tnx Mighty Indra, hope I'll remember that (owe to remember, when you posted it for me)

when I looked, in same setup, on sim of SissySIT and sim of SET with TN2560 (so Schade up, emulation of N SIT), gigglywiggly same in both cases, opposite of this one (#52)


anyway, I did judging by ears, after being stubborn ..... and amp stays SET, no plans of making TES iteration

 

[Zen Mod]

You don't need two channels. Just change from ARTA to DiAna and run with the same setup.

Thank you Botte

another new bone

🙂

 

[danny_66]

Wow, another nice amplifier, it's getting difficult to keep track of all the new amps 🙂

Is the SE version compatible with the Semisouth SJEP120R100 ?

 

[Zen Mod]

on paper yes, but didn't tried

all of Arrakis Spice I wanted, I got from Schade connected IRFP9140

save your SJEP for another amp, where it is going to be main Spice ingredient

 

[danny_66]

Aha, nice, I'll save it for that special one 🙂