UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Telefunken magnetophon C 2200 hifi Cassette Deck

knobtwiddler · 1st Oct 2022, 11:24 am

Do you have a live FFT program? You can get a MOTU M2 soundcard for around £120 (it has THD+N below many pro analysers). There is a shareware program called Audiotester.de (and many other shareware / freeware analysers).

The reason I suggest this is that it's easier to observe ripple and noise on an FFT. You could observe a spike at, say, 100Hz - whilst moving / adjusting parts and seeing if the changes make a difference. Obviously, you can do the same thing with a scope, but it will always be set to look at one part of the spectrum, whereas an FFT can show 20-20KHz at once.

1st Oct 2022, 11:24 am	#19
knobtwiddler Octode Join Date: Mar 2016 Location: London, UK. Posts: 1,047	Re: Telefunken magnetophon C 2200 hifi Cassette Deck Do you have a live FFT program? You can get a MOTU M2 soundcard for around £120 (it has THD+N below many pro analysers). There is a shareware program called Audiotester.de (and many other shareware / freeware analysers). The reason I suggest this is that it's easier to observe ripple and noise on an FFT. You could observe a spike at, say, 100Hz - whilst moving / adjusting parts and seeing if the changes make a difference. Obviously, you can do the same thing with a scope, but it will always be set to look at one part of the spectrum, whereas an FFT can show 20-20KHz at once.