This is the Sansui high-end AU-D907G EXTRA "working item". This integrated amplifier is based on the AU-D907F Extra and has been improved with improvements such as a ground floating circuit. (released in 1983) This is an amplifier that still has the Sansui tone. The rich, fluffy bass is good! You can still enjoy the sound of the high-end models from the heyday of audio. I think that vintage amplifiers perform at their best after warming up for several tens of minutes. (This is my subjective opinion, so please use it as a reference.) I think it will be difficult to make this specification in the future, cost-wise!
As for the sound, I did not measure it with a measuring device, but there are no problems, and it produces good sounds on records and CDs. Also, there are no scratches in the various parts after maintenance.
In order to improve sound quality, the switch contacts between the input and output parts have been disassembled and cleaned. (5 hours a day) Sound output has been confirmed for over three days. Please read to the end and make a bid only if you are satisfied (agree).
"Maintenance contents"
* Input, rec selector disassembled and cleaned
* Disassembled and cleaned each switch
* Disassembled and cleaned main volume contacts
* Cleaned balance and tone volume contacts
* Cleaned speaker relay contacts
* Repaired solder cracks on each board
* Cleaned bond for fixing capacitors (POWER board)
* Input terminal cleaning
* Internal and external cleaning
* BIAS, DC_0V, check and adjust (BIAS and service manual values)
"Check items"
* Phono MC, MM normal
* Tuner, aux, tape1, 2 normal
* Tone, balance, each switch normal
* REC selector normal
* No crackling noises in each part (There is a possibility of crackling in places that have not been operated for a long time)