EvilFuzz
Member
- Joined
- Dec 23, 2010
- Messages
- 9
Gentlemen, nice to meet you all.
It's my first post.
I have new but uncomplete A80 LAYBACK recorder.
With help from my friends and e-bay I found all parts - channel modules, move sensor and other.
Now machine work really fine.
But I can't find 1.080.399 Master Oscillator.
So, I made it by myself, one-side pcb from A80 manual. Other side has point-to-point wiring. It's my first "big" DIY work. I use original A101 opamps from my spare Studer boards.
It's working. But BIAS make HF noise, over 11dB higher then demagnetized tape make. It's very sad.
With oscilloscope I detect problem - after 240kHz band-pass filter sine is very good. After A101 sine have some deviations at tops and bottoms.
My friend, really good engineer, suggest: this A101 is slow for 240kHz. After replacement result was slightly different, but diviations still shown and noise still here.
Maybe Studer use special version of A101 for they oscillators? Or maybe something else? Any suggestions?
Thank you in advance,
Kirill
Sun Flower Sound studio, RU
It's my first post.
I have new but uncomplete A80 LAYBACK recorder.
With help from my friends and e-bay I found all parts - channel modules, move sensor and other.
Now machine work really fine.
But I can't find 1.080.399 Master Oscillator.
So, I made it by myself, one-side pcb from A80 manual. Other side has point-to-point wiring. It's my first "big" DIY work. I use original A101 opamps from my spare Studer boards.
It's working. But BIAS make HF noise, over 11dB higher then demagnetized tape make. It's very sad.
With oscilloscope I detect problem - after 240kHz band-pass filter sine is very good. After A101 sine have some deviations at tops and bottoms.
My friend, really good engineer, suggest: this A101 is slow for 240kHz. After replacement result was slightly different, but diviations still shown and noise still here.
Maybe Studer use special version of A101 for they oscillators? Or maybe something else? Any suggestions?
Thank you in advance,
Kirill
Sun Flower Sound studio, RU