A rebuild of https://www.diyaudio.com/community/threads/photo-gallery.71300/page-547#post-6969646
since that was 'destroyed' during shipping so someone could have a listen. The transformers used to be tie wrapped to a wooden plank that was glued. The weight of the transformers caused them to rip loose during transport Long story short. I used bolts for the ot since my brother is going to take it overseas in his suitcase. Also decided to use a tube rectifier and all but the first cap are dc link or pp.
One bolt missing...so that's a little to-do.
since that was 'destroyed' during shipping so someone could have a listen. The transformers used to be tie wrapped to a wooden plank that was glued. The weight of the transformers caused them to rip loose during transport Long story short. I used bolts for the ot since my brother is going to take it overseas in his suitcase. Also decided to use a tube rectifier and all but the first cap are dc link or pp.
One bolt missing...so that's a little to-do.
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Carrion, are you using the Madras boards? what transformers?
For easy reference, there is huge thread on the Sansui AU70 clone over
on the Polish audio forum here and they have at least 3 different PCB sets and multiple
Sansui transformer clone vendors there -
https://www.audiostereo.pl/topic/152864-klon-sansui-au-70-reduktor-szumu/
Marcin Waszak (Madrass) AU70 Pro described here -
http://ww.forum-trioda.pl/viewtopic.php?t=40216
Tricky and laborious to build, but the sound quality is very, very rewarding. AU-70 was an outstanding amplifier.
- 12AX7 preamplifier
- VU meter driver
- 12.6VDC: heating preamplifier (1) tubes and also DC power supply for VU meter (2) and input selector (7)
- 6AN8 driver/phase inverter
- 7189 power amplifier
- power supply
- input selector
Still waiting the case, until then .....
https://www.facebook.com/100004960264697/videos/pcb.1152137565920955/25577081798602395
Forgive me Tim deP, but I redesigned your amp TVA10 to Ultralinear....EL34, with 12au7 srpp input, 12at7 ltp phase slitter and 12au7 cathode followers, this amp did not use global negative feedback...
