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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
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Old 14th July 2018, 10:35 PM   #11
biju55 is offline biju55  India
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Nice Work Zen Mod ....
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Old 14th July 2018, 10:39 PM   #12
JSA1971 is offline JSA1971  Canada
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
Well done! 👏🏻
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Old 14th July 2018, 11:11 PM   #13
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
Next day , to solve few problems ........ naah , I can solve just one , lacking in not easy to drive speakers department

so , tossed 12cm fan , small 5+0V6+0V6 reg , and that's it

later I added switch to fan circ , just to ensure shorter warm up


rails are at healthy 25Vdc , Iq first set on inline 0R1 for each channel separately , later removed 0R1s , re-checked at 0R11 which are part of CRC in filter

yup - Iq is 1A7 , per channel ..... I don't wanna depend of some hypothetic square law ( I can't see it ) , so better more than less

that resulting in nice for summer 25 x 2 x 1A7 x 2channels =170W of heat

heatsink with lazy fan at Papa's Crikey , it can cruse all day long

IR measuring gun-like thingie with red dot is at home .... who needs that , anyway
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Old 14th July 2018, 11:26 PM   #14
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
few days later , I had on mind solving/trying few things :

-trying it on some harder to drive spks

-solving problems I had with my THD Spectra measuring rig . I coudn't make it to work after putting "new" EMU1212 and giving old Audigy to friend .
I wanted and needed bal in/bal out , but from sme reason bloody thing is not working ; box with at least 4 various Audigy cards is simply impossible to find in all mass of boxes on zillion of shelves I made crowded in years .
EMU is simply having too much channels , so my brain can't cope with it ...... or ?

anyway , first problem first .... at least while I'm not having solution for second one ; I already posted few pics (in Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans) of listening session/having fun occasion , we had at my friend Woland's ......

He's having Poor Man's RCA speakers - Tann DC in Gorgeous and Voluptuous and Luxurious MLTL cabs , dreamed/constructed by ZM , MIghty , Who Else .



So - after painstakingly long warm up time ( I didn't had that fan switch at a time , nor brain to realize necessity of it) , Babelfish M25 finally came to sound ....... it singed dozen of tunes , without special excitement from anyone .......

Reason , later I reckoned - two reasons:

- they're all bloody hooked on Papamps , so nothing new there,
- bloody Tanns in MLTL are also easy to drive , so no shine for M25 Cojones

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Old 14th July 2018, 11:32 PM   #15
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
and then ........... Biiiiiiig Ploooooooooonk!

I made a mistake - I did bring Papa's DEFiSIT with me ...... and put it in place of Babelfish M25

in 5 min, they didn't forgot just my Babelfish M25 ..... they forgot all amps listened in last 6 months

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File Type: jpg IMG_6912.jpg (102.5 KB, 297 views)
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Old 14th July 2018, 11:36 PM   #16
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
back to reality , day or two after

I found what's wrong with EMU - lack of brain combined with defective LCH output

switched to RCH output and all is well

of course that I made a mistake , while making new interface box wit bal in/bal out capability - I put it in plastic box .... forgetting that steel is better , esecially when dealing with lower level signals

one thing more to re-do

that time I'm going to put some protection zenners , at side looking back in sound card ; I don't need them , but who knows what's going to happen if I stumble on cable , while going on/from bench
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Last edited by Zen Mod; 14th July 2018 at 11:38 PM.
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Old 14th July 2018, 11:41 PM   #17
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
for starters , loop-back result , long cables going to and from interface ; it's really essential that everything left from 1K is ignored

steel , ZM , steel .......

every test graph is having it's title on bottom
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File Type: png EMU1212 loopback through interface box SE.png (15.0 KB, 258 views)
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Old 14th July 2018, 11:46 PM   #18
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
now , battery of tests at 1W

remember - crappy PSU (old caps - see that garbage left of 1K) , intentionally crappy wiring

due to lowish levels involved and my overall lazyness , I must accept sort of lower dBFS levels ....... don't know no one able to make me some decent gain stages with uber OP chips .....

1W/8R (see - same figure as Papa's original M2 ..... easy load)

1W/4R

1W/2R
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File Type: png Babelfish M25 1W_8R.png (63.2 KB, 200 views)
File Type: png Babelfish M25 1W_4R.png (61.8 KB, 141 views)
File Type: png Babelfish M25 1W_2R.png (62.0 KB, 116 views)
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Old 14th July 2018, 11:49 PM   #19
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
that day I was able to complement just 10W tests .... couldn't get more at 8R , due to EMU output swing (non)capability

so :

10W/8R

10W/4R

10W/2R
Attached Images
File Type: png Babelfish M25 10W_8R.png (62.2 KB, 124 views)
File Type: png Babelfish M25 10W_4R.png (59.6 KB, 92 views)
File Type: png Babelfish M25 10W_2R.png (59.4 KB, 78 views)
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Old 14th July 2018, 11:54 PM   #20
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25 , AKA M2 on steroids , AKA M2-XA25 bstrd
I was thinking today - I'm really lazy to make superduper OP gain stage , to obtain 6db thingie , and put in between EMU output and interface box , to be able to get more watts for scope; I'm going to use precious Iskra repeater as autoformer , with 6db gain , and see what I'm going to get

I'm anyway more interested in comparison of THD on higer power levels than in absolute values

so , I tried exactly that : 6db gain autoformer ditto on EMU output , so you can see loop-back test is ........ Steel, ZM , Steeel!!!!! , almost joke

so - ignore again everything left of 1K , take rest with pinch of salt
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 15th July 2018 at 12:09 AM.
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