|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
81.246.236.6
In Reply to: RE: Revox B226 dirty treble posted by knewton on April 19, 2016 at 06:05:21
I do have the schematics. It's a PDF file, not sure how to post it here?
I doubt the B226 can be described as "badly implemented digital"; it sure dates (1987) but was one of the best at the time...
That said, the SAA7220 chip that provides clock and oversampling for the TDA1541 is said to be very noisy...
I just did some experiment wich seemed to help clean up the treble (but it might be my imagination): seeing as the output coupling cap is a polar electrolytic (silmic II), I added a second, back-to-back capacitor in serie, opposite polarity (-++-) to simulate a bipolar. It seems that high frequencies are now more fluid and cleaner. But it might just be in my head, or placebo effect.
Follow Ups:
If you have a PC open the pdf and makevit occupy as much of your screen as possible. Then press ctrl alt and print screen at the same time. Open paint and then click edit and paste and there is the pdf. Crop as needed and save as a jpeg.
ET
You can open the PDF file with a PDF application (Apple's Preview in my case) and export it as a JPEG file, which can then be uploaded to AA.
I'm not suggesting that it's badly implemented, merely conventionally implemented. Which, in itself, is sufficient to account for the sound character that you describe. If you can post that PDF it may help.
_
Ken Newton
Edits: 04/19/16
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: