Demonstration of the use of dbx on a Teac X2000-R tapedeck. 

You are very welcome :D

That is a great machine. I have not been able to find one, but I would happily trade. Also it is admirable that you have succeeded to up the level to 320. I'm surprised the pots would go that far!

The service manual lists 370nWb/m as the standard flux level. This would even be acceptable for the version I have (X-2000M) at 15IPS with a modern tape, but not for the R (low speed) version. I needed to make a small modification to the circuit so that the VU reading was the same in source and tape.

Yes

That seems to be an audio enhancement unit that enhances the sound in all kinds of artificial ways. Has nothing to do with the dbx in this video. If you want to buy an external unit that does what this deck does, get a dbx 150.

That would be 19 cm/s

Have you listened to the audio on headphones? Did you understand what this video is all about?

@@PhilipvanderMatten Hi Philip now i have listening with headphones and now i have understand the dbx thing ;-) I have an ask from your other video "servicing N4520 mechanical" have you made part 2 with the electrical adjustments ? please I have also the maschine an N4520 and N4522 half track. The N4520 is working perfect. By the N4522 i have a Problem with the winding speed. I hope you understand me my English is not so good :-) I will try to explain. The forward Winding Speed is ok . But when I try to REW the Tape at the end the Speed at begining fast an normal but in the middle the Speed is slower and slower and it will stops. If i pull down the left tension roller the speed comes faster and faster. The time to >>Rewind a full Tape can be 5 minutes and more if i not pull down the tension roller. Have you an Idea what this could be ? I have made no adjustments. The only i have do is build in a new Wickel-Motor. Have you a few tips what i could do ? Many thanks :-)

@@peterabbrederis1037 If I understand you correctly the problem is with the adjustment of the tension roller. I believe that is covered in that video. Have you watched it?

@@PhilipvanderMatten yes you have understand correctly i have seen this in the video but one time it works and one time not i have not made any adjustments the mechanik is the same at the 4520 could it be a electrical problem ?

@@peterabbrederis1037 Service manual, chapter 4, section 9. There you go!

Matt K no

welk crosstalk probleem?

Ik hoor kant B ook heel zacht door de muziek heen. Ze noemen dat crosstalk schijnt. Is een bekend fenomeen

@@jeroenheringa5821 crosstalk is meestal en waarschijnlijk een mechanisch probleem dat je koppen niet lekker staan. Heb je het ook als je op datzelfde deck opneemt? Anders is het electrisch. Verder lijkt me een compander systeem (wat dbx is) niet echt geschikt om dat soort problemen te lijf te gaan. Is puur voor noise reduction. Ik zou het niet doen. Is het in de verkeerde hoek zoeken. Kijk op de wiki pagina.

@@PhilipvanderMatten Oké bedankt. Ik lees en hoor verschillende dingen hierover. Ik heb de Akai vorige week gekocht dus ga het daar aankaarten. Kunt u de koppen afstellen evt ? Of heeft u een goed adres ?

Ik moet zeggen dat ik het niet echt heel erg storend vind overigens. Het is alleen te horen als de muziek afgelopen is. Bij de fade out dus. Maar ik los het liever op .

Maybe because it was an external unit? And the deck wasn't properly set up maybe. If the combination is not working, the result will be bad.

@@PhilipvanderMatten I bought the unit, their second iteration, the first being the DBX 117, in the summer of 1975.The unit was totally discrete, and an external unit. It had variable expansion and compression ratios plus variable gain. To get any real hiss reduction on a Teac 360S, Cassette deck, the unit could be heard as, " Breathing", increasing/decreasing hiss. The 360S was biased for TDK SA tape. I upgraded to a Teac 2300 SD reel deck with Dolby B, onboard, biased for Scotch 206/207 and Ampex Grandmaster 456 tape. Didn't require the DBX, to achieve good performance. Then I purchased a Revox B 77 with no noise reduction and at 15 or 7 ips there was no discernable noise present. The B 77 was biased for the Grandmaster tape. The B 77 was used to archive albums and I was very pleased with its performance. I've not heard the DBX, IC version on a reel deck, but with all compansion ratios set by the IC, it must sound very clean. Currently to copy CDs from various Libraries for free, I playback through the digital out of a Philips/Magnavox CDB 650 to the digital input of a Tascam CDRW 700 CD recorder. I employ an Audio Note Kit DAC as a playback DAC, and am pleased.