I have one of these I bought from The Mellow Tone Inn, a New Zealand website which sells some very nice radios. It is a nice sounding radio, but has all of the original caps still, I bought it for my step son, who uses it in his computer room to play music through from his phone as it has a P/U input. However of late it has been unuseable due to a loud buzz, (50Hz) whenever the volume is raised and it get's a bit hotter than it should, therefore I have decided to re-cap it, however I don't have and can't find a skerrick of information anywhere on this model. I am thus asking, does anybody know anything or know where I may obtain a schematic in order to work on it and have a handy reference if I find difficulties or mystery values on old bits?

I'll try and get a photo up soon and valve lineup.


Cheers.

One place to ask about schematics for NZ radios is here: http://www.nzvrs.pl.net/

Is this similar to the 22RB266 Philips listed in radio museum site.
A Hybrid, i.e. transistors and valves.
And mains operated?, if so you probably should have done a complete safety check on it before letting your stepson use it.
Particularly when he is plugging something external in to it.
I immediately think of electrocution and fire.
JJ

One also has to be careful with the PU on old radios. In some early sets you could destroy the back bias.

In the hybrids, its not only the filters, it all electrolytics as they used them for inter-stage coupling & they dry out & that kills volume.

Be very careful with the wording. Buzz is more the product of Switch Mode power supplies and Compact Fluorescent Lights & Computers 50Hz from the mains is hum. That can cause wrong conclusions in relation to source.

It may pay to take sharp photos of the wiring / boards so as components can be seen: Some are rubbish.

It is possible to replace parts without a circuit. Photograph before you start and be very wary of rework, I have had two radios this month with wrong parts.

Marc

Now for the safety warning.

The "U" suffix on Philips model designations stands for "Universal" - or in other words, AC/DC.

This means no power transformer & a potentially live chassis. I would not be plugging anything at all in to the P/U input, & especially not an i-Phone.

AC/DC radios from a servicing point of view are a death trap. Even experienced techs have been caught out. When servicing, a isolation transformer is required & it is most important not to earth this set. If you are going to use this radio at all, a twin-core mains lead with a moulded plug is required. The neutral (blue or black) wire going to the chassis is about minimally as safe as you will get.

New Zealand made Philips radio's usually followed the designs of European Philips models but with a NZ model designation. If you can provide the valve compliment we may be able to work out which European model it is based on.

Yes, there is no transformer, we won't be using it until it's been re=capped and sorted out. It seemed too modern looking for an AC/DC set, but with NZ I suppose it is not surprising!