Well , after some time , I'm able and willing again to bring some Babelfish J packages ; Sort of altered schematic , inlcuding cascodes (easily avoidable by choice) for input LTP , biased through my green (LED string ) trademark thingie .
Package would be comprised of :
-pcbs (one layer , usual thickness/color/overlay mumbo jumbo)) , 2 pcs,
-2 pairs of matched J271 JFets for input LTP - in this project perfect
substitute/replacement for Toshiba 2SJ74BL ,
-2 pairs of BC556C bjt LTP cascode critters,
-3+3 more BC critters for various positions
-2pcs of MMBF5486 smd JFets , working as CCS for cascode biasing,presoldered on pcbs,
-2 pcs of 1uF Philips MKC (polycarbonate, my fave ) , bypass for critical position - cap for Aleph CCS modulation .
so , end of list; few more details :
Output mosfets prescribed - IRFP150 (one effectively as two IRFP240), just one pair , no matching needed .
Soldering of outputs - either through hole or on wire bridges on upper pcb surface .
Due to cascoding , PSU voltage can be freely augmented for several volts. Also possible multiplying of outputs with some necessary ingenuity , but if there is enough noise , I can make daughter boards for paralleling of , say , 3 mosfets , when there is no need for additional ingenuity .
Price - not cheap , but also not overly expensive , considering that rest what you need is available even in nearest Tobacco store .
So , that'll be 80E (or adequate amount of US Greenies) , Paypal fee and air mail traceable shipping included in price.
Screenshot of pcb and sch pdf attached .
In this moment first small batch of pcbs is ordered , usual lag is 12 to 15 days , depending of pcb vendor schedule
Package would be comprised of :
-pcbs (one layer , usual thickness/color/overlay mumbo jumbo)) , 2 pcs,
-2 pairs of matched J271 JFets for input LTP - in this project perfect
substitute/replacement for Toshiba 2SJ74BL ,
-2 pairs of BC556C bjt LTP cascode critters,
-3+3 more BC critters for various positions
-2pcs of MMBF5486 smd JFets , working as CCS for cascode biasing,presoldered on pcbs,
-2 pcs of 1uF Philips MKC (polycarbonate, my fave ) , bypass for critical position - cap for Aleph CCS modulation .
so , end of list; few more details :
Output mosfets prescribed - IRFP150 (one effectively as two IRFP240), just one pair , no matching needed .
Soldering of outputs - either through hole or on wire bridges on upper pcb surface .
Due to cascoding , PSU voltage can be freely augmented for several volts. Also possible multiplying of outputs with some necessary ingenuity , but if there is enough noise , I can make daughter boards for paralleling of , say , 3 mosfets , when there is no need for additional ingenuity .
Price - not cheap , but also not overly expensive , considering that rest what you need is available even in nearest Tobacco store .
So , that'll be 80E (or adequate amount of US Greenies) , Paypal fee and air mail traceable shipping included in price.
Screenshot of pcb and sch pdf attached .
In this moment first small batch of pcbs is ordered , usual lag is 12 to 15 days , depending of pcb vendor schedule
Attachments
some random pics
for stereo set - there is optional set of 4 daughter pcbs (2 per channel) , for 18E more
general chat about is located here
for stereo set - there is optional set of 4 daughter pcbs (2 per channel) , for 18E more
general chat about is located here
Attachments
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