Philips N4450 reversing. - UK Vintage Radio Repair and Restoration Discussion Forum

Reelman · 2nd Dec 2008, 6:35 pm

Split from this thread:-

https://www.vintage-radio.net/forum/...re+Ended+Bulbs

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Whilst on the subject of this recorder it mentions in the original instructions that the tape will only reverse when playing/recording left-to-right, so after one reversal the tape will stop when it gets back to the beginning. It goes on to say: "If continous reversal is desired please consult your dealer". Well I have both manuals and there is no mention at all of how to achieve it. Would the dealer have received special technical advice on how to do this? Just curious to know.......
Thanks
Peter

Sideband · 2nd Dec 2008, 9:15 pm

Hi Peter.

It must be over 25 years since I last worked on one of these at the Philips workshop. I seem to remember that there was a mod for continuous auto-reverse and I think it involved fitting an extra panel. Sadly I don't have any information on these neither do I work for Philips any more so can't even dive into the archives. The BBC had a few of these and some of the small recording companies and we had a few requests for conversion. I don't think the panel was available for very long though....certainly after about 5 years or so, it wasn't available.

There may be some information on the Web about these but as to the conversion....probably not. It was one of those 'special request' type modifications so not generaly released.

Rich.

ben · 2nd Dec 2008, 11:10 pm

Don't know this deck but surely it would be a case of knocking up a circuit possibly involving a relay, timing cap and a transistor or two.

Reelman · 4th Dec 2008, 2:13 am

Thanks for replying. Interesting that it was an extra panel rather than just "bridging a jumper".

Ben: I'm sure you are right especially since all the logic is discrete - no ICs except for the capstan motor speed control.

2nd Dec 2008, 6:35 pm	#1
Reelman Octode Join Date: Aug 2008 Location: Rotherham, South Yorkshire, UK. Posts: 1,724	Philips N4450 reversing. Split from this thread:- https://www.vintage-radio.net/forum/...re+Ended+Bulbs ----------------------- Whilst on the subject of this recorder it mentions in the original instructions that the tape will only reverse when playing/recording left-to-right, so after one reversal the tape will stop when it gets back to the beginning. It goes on to say: "If continous reversal is desired please consult your dealer". Well I have both manuals and there is no mention at all of how to achieve it. Would the dealer have received special technical advice on how to do this? Just curious to know....... Thanks Peter Last edited by Station X; 2nd Dec 2008 at 6:55 pm. Reason: Post moved.

2nd Dec 2008, 9:15 pm	#2
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Philips N4450 reversing. Hi Peter. It must be over 25 years since I last worked on one of these at the Philips workshop. I seem to remember that there was a mod for continuous auto-reverse and I think it involved fitting an extra panel. Sadly I don't have any information on these neither do I work for Philips any more so can't even dive into the archives. The BBC had a few of these and some of the small recording companies and we had a few requests for conversion. I don't think the panel was available for very long though....certainly after about 5 years or so, it wasn't available. There may be some information on the Web about these but as to the conversion....probably not. It was one of those 'special request' type modifications so not generaly released. Rich. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

2nd Dec 2008, 11:10 pm	#3
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Philips N4450 reversing. Don't know this deck but surely it would be a case of knocking up a circuit possibly involving a relay, timing cap and a transistor or two.

4th Dec 2008, 2:13 am	#4
Reelman Octode Join Date: Aug 2008 Location: Rotherham, South Yorkshire, UK. Posts: 1,724	Re: Philips N4450 reversing. Thanks for replying. Interesting that it was an extra panel rather than just "bridging a jumper". Ben: I'm sure you are right especially since all the logic is discrete - no ICs except for the capstan motor speed control.