Below looks close to the one I auditioned back in the 70's. They can still be found I see.
https://www.ebay.ca/itm/313648847673
https://www.ebay.ca/itm/313648847673
Citizen, connecting V-FET sources to the load can also be in Common Source
configuration - with voltage gain - look at the Yam B-1.
https://www.diyaudio.com/community/attachments/sit-audio-175-2-50-png.1041944/
Athanasios, MJ articles in this thread were provided by Petoluk.
Translation was done by Google Images - quick.
configuration - with voltage gain - look at the Yam B-1.
https://www.diyaudio.com/community/attachments/sit-audio-175-2-50-png.1041944/
Athanasios, MJ articles in this thread were provided by Petoluk.
Translation was done by Google Images - quick.
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Thanks @petoluk . I am in dire need of a schematic for the Sansui BA-1000.
I am not good at designing schematics but am attempting to do so with Digikey's Scheme-it web software.
I am trying to do one half of the amp section and this is as far as I got . Its messy for sure....I am using a layout I made using a photo of the Solder side of the board . many of the traces are hard to follow so I also am using the main board to look at .
This a photo of the printed photo, so its not that clear .
And here is the actual photo , much clearer .
I am not good at designing schematics but am attempting to do so with Digikey's Scheme-it web software.
I am trying to do one half of the amp section and this is as far as I got . Its messy for sure....I am using a layout I made using a photo of the Solder side of the board . many of the traces are hard to follow so I also am using the main board to look at .
This a photo of the printed photo, so its not that clear .
And here is the actual photo , much clearer .
Tough luck - I found the mag but (as I expected) the article in question is just a quick introduction / review of the (then) new Sansui product = no (proper) schematic to speak of...
Attachments
Here are the two Sansui V-FET patents, which may be relevant to
the actual BA-1000 design...
the actual BA-1000 design...
Well during my quest for a schematic to figure out what was wrong with my rebuild of the BA-1000 I discovered a stupid error after getting some help from a blogger Yama-Chan on a Japanese blog site.
He gave me what the voltages should be at the V-fet sockets and the 2SA798 . Mine were off , obviously , so i began my search and looked at the parts I removed . I realized at TR05 and 06 they used a 2SC1124 which , somehow I overlooked, have a EBC pinout where as the KSC2690 I use have a ECB pin out. realigned the pinout and now all is well !!
This quest though forced me to make a crappy version of the schematic . I'll post it here and maybe some one more well versed in circuit design can do a cleaner version than my sad attempt 😉 lol
Some resistor values are missing and no cap values listed. I might at some point add those and maybe some voltages .
But thanks for the help gentlemen!!
Athanasios
He gave me what the voltages should be at the V-fet sockets and the 2SA798 . Mine were off , obviously , so i began my search and looked at the parts I removed . I realized at TR05 and 06 they used a 2SC1124 which , somehow I overlooked, have a EBC pinout where as the KSC2690 I use have a ECB pin out. realigned the pinout and now all is well !!
This quest though forced me to make a crappy version of the schematic . I'll post it here and maybe some one more well versed in circuit design can do a cleaner version than my sad attempt 😉 lol
Some resistor values are missing and no cap values listed. I might at some point add those and maybe some voltages .
But thanks for the help gentlemen!!
Athanasios