Philips Monochrome Sets - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

Synchrodyne · 18th Jul 2013, 6:38 am

Sometime back I tripped across this site:

http://frank.pocnet.net/instruments/...R/TV_docs.html

which has schematics, etc., for quite a range of Philips European TV receivers. Many would predate the era of interest (post-1965), but some would be later than this.

Included are several Belgian multistandard models, some of which might go back to the start of Belgian TV in 1953. These show an interesting progression in their approach to sound IF in the VHF-only era, starting with a common split sound strip for FM as well as AM including a second conversion to 7.0 MHz, then moving to intercarrier on FM with a separate dual-frequency AM IF strip, then to a combined FM-AM IF strip operating at FM intercarrier and two AM frequencies. Also it would appear that even in the early models line-gated AGC was used with both positive and negative modulation systems. In the UHF era, System L was covered as well as Systems G and H.

Cheers,

Philips Fan · 18th Jul 2013, 1:01 pm

Very intersting find. As you say many predate the period of interest for my site but still a very usefull resource.

Many thanks

Robert

Restoration73 · 18th Jul 2013, 11:21 pm

Question regarding X12T740 (T4 chassis)

The set also marketed as Pye 99 use a TBA240 (I think) as a video demod/sync sep.
I tried to source this this chip around 1990 to no avail - even a chip supplier told me of his woes at not being able to assist with requests for this IC, including from Africa.

Seemed such a shame to write off a set that could work well.

I did later try a mod using Motorola MC1330 with limited success.

Thanks, Tony

Maarten · 23rd Jul 2013, 12:48 pm

The predecessor to the TBA240 was the N161OM or 161OM for short (actually a pre-production designation but they were used in sets anyway). While it seems unlikely, there might be some stock left of those as brokers and buyers probably don't recognise that number. Also, when packed for service, the 4822-code was printed on the package. Equally unlikely, someone may have stocked them under that number.

Some small modifications might be needed to make the N161OM work.

18th Jul 2013, 6:38 am	#41
Synchrodyne Nonode Join Date: Jan 2009 Location: Papamoa Beach, Bay of Plenty, New Zealand Posts: 2,944	Re: Philips Monochrome Sets Sometime back I tripped across this site: http://frank.pocnet.net/instruments/...R/TV_docs.html which has schematics, etc., for quite a range of Philips European TV receivers. Many would predate the era of interest (post-1965), but some would be later than this. Included are several Belgian multistandard models, some of which might go back to the start of Belgian TV in 1953. These show an interesting progression in their approach to sound IF in the VHF-only era, starting with a common split sound strip for FM as well as AM including a second conversion to 7.0 MHz, then moving to intercarrier on FM with a separate dual-frequency AM IF strip, then to a combined FM-AM IF strip operating at FM intercarrier and two AM frequencies. Also it would appear that even in the early models line-gated AGC was used with both positive and negative modulation systems. In the UHF era, System L was covered as well as Systems G and H. Cheers,

18th Jul 2013, 1:01 pm	#42
Philips Fan Retired Dormant Member Join Date: Dec 2006 Location: Suffolk, UK. Posts: 260	Re: Philips Monochrome Sets Very intersting find. As you say many predate the period of interest for my site but still a very usefull resource. Many thanks Robert

18th Jul 2013, 11:21 pm	#43
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Philips Monochrome Sets Question regarding X12T740 (T4 chassis) The set also marketed as Pye 99 use a TBA240 (I think) as a video demod/sync sep. I tried to source this this chip around 1990 to no avail - even a chip supplier told me of his woes at not being able to assist with requests for this IC, including from Africa. Seemed such a shame to write off a set that could work well. I did later try a mod using Motorola MC1330 with limited success. Thanks, Tony

23rd Jul 2013, 12:48 pm	#44
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: Philips Monochrome Sets The predecessor to the TBA240 was the N161OM or 161OM for short (actually a pre-production designation but they were used in sets anyway). While it seems unlikely, there might be some stock left of those as brokers and buyers probably don't recognise that number. Also, when packed for service, the 4822-code was printed on the package. Equally unlikely, someone may have stocked them under that number. Some small modifications might be needed to make the N161OM work. Last edited by Maarten; 23rd Jul 2013 at 1:17 pm.