This is very true, Forr,
This particular amp has two patents (self regulating VAS current and something else if I remember correctly) but the drawback was that this amp (and possibly other Sansui amps as well) operated on the verge of stability. I never had any Sansui equipment and I am not really familiar with their designs. Simply when I saw this kit on EBay I decided to check the net for similar designs before deciding whether to buy it or not and found this Sansui.
cheers,
This particular amp has two patents (self regulating VAS current and something else if I remember correctly) but the drawback was that this amp (and possibly other Sansui amps as well) operated on the verge of stability. I never had any Sansui equipment and I am not really familiar with their designs. Simply when I saw this kit on EBay I decided to check the net for similar designs before deciding whether to buy it or not and found this Sansui.
cheers,
There is no NFB cap. Matched JFET input and trimming is used instead of a servo.
Yes, there is an NFB cap, from RF2/1K to ground. No value is specified though.
Matching N and P JFets at the input might be a serious problem to accomplish a stable, no-DC output.
In any case, if you have DC protection might be worth trying.
Hi Janusz,
I you can afford some Sansui vintage, you may like it. They were well built and very nice to look at. For example, I love my tuner TU555 (excellent sound too), here are some pictures
sansui tu555 - Recherche Google
I you can afford some Sansui vintage, you may like it. They were well built and very nice to look at. For example, I love my tuner TU555 (excellent sound too), here are some pictures
sansui tu555 - Recherche Google
The Real Sansui still exists but only in Japan they sold the name in all the other territories.
sansui-jpn
sansui-jpn
Fakes were output devices (ON-Semi NJW3281...)...the emitter resistors bad quality too...once replaced the unit works fine..two buyers are available: Tubeshunter and Jimsaudio..Tubeshunter don´t send any information..and the boards are different too from different suppliers...Good luck.
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