I have come into possession of a Mullard Type 736 which I would like to restore. Could anyone help me out with a Schematic? The valve lineup (6) looks like it might be: ECH35, EF39, EF39,??, EL33, EBC33, plus tuning eye type 6U5.

Regards

Rob

Click on image for larger resolution

Looking at
http://www.hws.org.au/RadioHistory/manufacturers/Mullard.htm

The only Mullard with a 6U5 is the 1938 Model 96 with line-up 6U7G, EK2G, 6U7G, 6B6G, 6V6G, ?, 6U5.

Searching for EBC33 & EF39 indicates theses valves were not used at all, EBC33 got some use between late 40s & early 50s.

Maybe this was a British radio. At any rate more info is needed. Does it have an ARTS&P sticker?

Cheers
Graham

There's no Model 736 in the 1938 AORSM although that doesn't mean it isn't an Aussie set. Perhaps it is British though. Does the radio have Australian or British callsigns on the dial?

Roboz6,

If you have a picture of the receiver you can e-mail it to me and I will include it in your post. My e-mail shows on my profile page. Pictures are always best when trying to identify a model.

Brad, Graham

There are a range of call signs on dial glass, though the mix is a bit obscure - not the usual mix. Initially I thought they were Australian stations, but on reflection I realise they are not what I would normally expect to see.

Has sticker on the back, though not usal ARTS&P type. I will photograph the back when I am home tonight and send more info, plus scan of dial glass.

You guys may well be right - might be an import. Have heard that some Mullard models were rebadged Philips. Could that be the case here?

Rob

G'day Rob,

Mullard originally sold radios made by Airzone however later sold radios made by Philips. As far as I am aware this only applied to Australia.

Hi Brad,

I have sent you some pictures to your email address which illustrate the radio, the stickers etc, which should help clarify what I am talking about when you repost them. The dial glass I have removed for scanning (cracked) and eventual reproduction. The dial glass style looks particularly like the Philips style to me.

Cheers

Rob

No worries Rob. I have a few pictures to post in a few threads and should have them up tomorrow morning. I have the morning off work to sort a few things out and will upload the pictures whilst I am waiting.

Brad,

Thanks for posting up the pix above. I have done more research and am convinced this set is a rebadged Philips. Have found a few similar looking sets on the net, but I have not been able to zero in so to speak.

So how about it people, anyone have any info on Mullard type 736 aka Philips in Australia?

I have the set running now, but it would be good to get hold of the schematic so I can check component values etc in detail.

Cheers

Rob

G'day Rob,

A few observations from your photos.

Looking at the chassis, the set is of Philips construction (labeling and components)..

The ARTS&P label is in a different format to those used in Oz and the H prefix to the serial number was only used in NZ from 1942 to 1946.

The photo of the dial glass is interesting. Station call signs are a mixture of OZ and NZ.
Most of the Aussie calls are from the South East of the country and are on the correct spot on the dial for the period. eg.

2CR Cumnock 550 kHz
3WV Horsham 580
2FC Sydney 610
3AR Melbourne 620
3GL Geelong 1350
2BS Bathurst 1500

The zig-zag logging scale was often used by Philips in their sets which had shortwave coverage.

On the strength of the above, I'd say that you have a set made by Philips in NZ. Not much help in finding a schematic but may help track it down.

Cheers, Graham...

Hi Graham,

Thank you for your astute observations. Basically you agree with my conjectures - I have a Mullard which is a rebadged Philips. I hadn't considered the NZ angle, but it opens up a new area of research for me.

Any NZ members out there who can help?

Cheers
Rob

A few notes, a couple favouring NZ manufacture

-NZ radio chassis manufactured in Oz carrying the ARTS&P sticker can carry a circular sticker saying "licence extended for the Dominion of New Zealand"
eg http://vintage-radio.com.au/default.asp?f=2&th=114
Lack of this sticker favours NZ manufacture of the 736

-Stokes "Golden Age of Radio..." says
= Philips/Mullard ceased NZ production in early 1942 and recommenced after the war in 1947
= Airzone supplied Mullard sets up to 1940; after that Philips supplied
= a similar NZ Philips cabinet is shown, albeit with a vertical dial to the right, the M158, 1941, 6 valve all wave with tuning eye. Moulding at the top and knob layout are the same. Knobs have the white ring. This also favours NZ manufacture.

More questions than answers:--

I assume this is a mains set with a transformer rather than Battery or Live chassis AC/DC type?

If its mains with transformer, we seem to be missing a rectifier.

This could be wartime production where valves were chopped & changed due to availability & many Philips valves were used. ECH35 and 6J8 were often interchanged as they are pin same.

If a valve failed it may have had an equivalent or similar put in to just get it going until new production of the correct valve started again, after the war?

Sometimes you can be lucky & the line up is still on the cabinet or chassis.

Be prepared to draw it out.

There is a guy in our radio club going back to Holland to radio events, he may be able to get info? He collects Philips radio's

Marc

Marc,

This is a normal AC set with mains transformer and rectifier valve. In my original posting I show a "?" in the valve line up - this was for the unidentified rectifier valve.

The torn sticker on the back doesnt show this valve - isnt that always the way. The rectifier valve itself has had the marking rubbed off, but I have reason to believe that it may be an AZ31, but I havent traced that part of the circuit yet or done heater voltage checks to confirm this.

Rob

The only way to get some idea of the rectifier is to roughly work out the sets HT power consumption and to identify the pinouts and the base type.

Eg. If it got 4 pins it could be an 80.

Eight pins 5Y3, & relatives, the distinctive seperate filament winding and filaments on pins 1 & 8 Anodes 4 & 6. Beware the unused pins can often be used as tag strips.

Phillips / Mullard "P" Base

EBC33 would pin interchange with 6B6 however the EBC33 requires more grid bias (-5.5)

AZ31 has a 4Volt filament on pins 2 & 7 and may have bigger that usual input capacitors. it's an octal. anodes 4 & 6

Note collector has not got this circuit

Marc

Marc

Hopefully I will have time this weekend to have a look at the rectifier along the lines you suggest and shed some light on the likely identity of the rectifier.

Rob