Archive for My construction

Iron Pre

Well ,it started as solution for two customers; both having my Babelfish amps, both driving Dynaudio Contour 1.3 with them.

Whatever solution they had for preamplifier in that time, they weren’t on par with amp quality ….. so logical development of situation is to mate  amps with line stage simple enough but not simpler than necessary …… simply put -preamp made in same manner.

After some chat , consensus was that “plain” buffer (so , no gain ) is adequate,so I decided to make a quick mockup with buffer pcb I had from yore,as part of Poor Serbian Man Lightspeed project.

Frankly – not “plain” buffer anymore , but I simply couldn’t go with less .

Basically-4 separate buffer cells , and simple but witty bipolar (+/-12V) shunt reg on board.Cells are made of scarce and expensive Toshiba JFets (2SJ74BL , 2SK170BL) as source follower. In this case , just two buffer cells are populated, as not needed more for unbalanced operation. For more details, it’s easy to check my signature on diyaudio.com .

Schematic sketch and first proto , conveniently put in dreky casset deck case :

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Babelfish J , v2

As any named Babelfish – my iteration of Papa’s gadget .

This one is iteration of Aleph J , v2 means made as adaptive base for making almost entire power range of Aleph amplifiers .

Naturally – JFet input , cascoded to prevent poof from excessive rail voltage , additional Daughter boards for additional output mosfets.

More info here .

 

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Babelfish J2 , pair of them , for Denmark ……. (Blast from the Past)

Two and half years ago , my fluffy friend Magura asked for sort of favor – wanting me to make two (stereo) Babelfish J2 amps (one of Shameless First Watt Iteration by Mighty ZM )   for his friend , intended for biamping some Gargantuan speakers; after some time , we agreed about parts and everything , and adventure followed …..

They acquired heavy artillery – cases from HiFi2000 , Rifa caps , some heavy NTCs , Semisouth outputs , power On/Off switches , Cardas posts , XLRs , RCAs …. while mains xformers (500VA per stereo case) and pcbs with small parts and few other itsybitsies were mine to complete.

Then entire shebang was smuggled to my (non-EU) country and work begun .

Cases are 5U/400mm deep .

 

Semi-assembling and first markings for drilling and tapping:

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Big Tannoy Open Baffle fun …… playing with test xover

Continuo from here ;

Still without measurements , just playing with data from various web sources , LTSpice and bunch of parts

 

Big Tannoy MLTL for Woland , part 2 …….. (I’m proud ;) )

As previously written here : Big Tannoy MLTL for Woland ;

Box design and calc by Mighty ZM , box production by Woland’s local Wood Meister .

Presentation thread , after first listening impressions is at Baby Diyaudio .

For non Serbian-speaking , just use translate function in Chrome , or go to this , already translated , page : Translation .

So – if you can’t have proper horn ……. or OB doesn’t cut for your room or ears , go for MLTL

😉

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