Nameless 1938 Ozzie Radio
|
|
|
|
Location: Brisbane, QLD
Member since 22 December 2014
Member #: 1672
Postcount: 13
|
Hi all,
Could you identify this radio please, and even hint where I might find a circuit diagram?
I found this cabinet radio at the local dump and put it away in my shed. Some 3 years later, it was still part of the shed clutter and it was about to be returned from whence it came.
Then I had a second look. Hmmm!
The cabinet is weathered but it is well built and solid, it alone will restore well.
The electromagnetic speaker ( four wire connector) has been stolen, but I have temporarily jerried up a modern speaker and audio transformer.
At this stage I have a weak 4QR signal (612kh) ,with my finger on the 6A7 RF valve , where the cap should be, so I'm optimistic!!
The signature " Miller 4.7.38" on the IF can must indicate the date of manufacture.
The valves are all pre centre locating pin. Were they called Octal? Forgotten!!
Re the speaker: I have an electromagnetic speaker out of a 1948 Philips 3552 with a 7 wire connection that would be perfect..... if I could only remember how we used to fit them.
A comparative schematic or a simple mud-map would be helpful if somebody has the time.
Thanks for listening, G.
|
|
|
|
Location: Blue Mountains, NSW
Member since 10 March 2013
Member #: 1312
Postcount: 401
|
The valve lineup and some photos would help with identification. Refer to point 6 below on how to email photos.
|
|
|
|
Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7290
|
Someone else has enquired about a console that looked like this in the past. I don't remember what the result of the query was though. I will keep looking.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...
|
|
|
|
Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5239
|
Miller may be a repair. 6A7 appeared in 1934. I would have thought by 1938 we were getting away from using plate detectors (6C6) & moving toward 6B7 & the like.
It appears that we have an 80 rec; 6D6 IF; 6C6 Detector; 6A7 Pentagrid; 47 OP. The two valve top caps may be repairable? (have done)
Marc
|
|
|
|
Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6678
|
Having difficulty finding a match to that line-up. Now, if the OP were a 42 I'd have some candidates.
|
|
|
|
Location: Brisbane, QLD
Member since 22 December 2014
Member #: 1672
Postcount: 13
|
Thanks folks,
Your comments are welcome, and yes having signed many a chassis in the past, I wondered about the 1938 date.
GTC, the OP valve is a 42. The rest are as Marcc has listed them.
Brad, I have some woodworking experience so the cabinet interested me. It is much better crafted than the average "branded" assembly line cabinet. Consequently, it is still sturdy and restorable regardless of some weather exposure.
Gary
|
|
|
|
Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5239
|
It actually may be a 42. That card pixelates when you try to enlarge it. We need some missing feedback, as one is a 2.5V filament tube & 42 is a heater tube.
The more info we get, the more hope we have of finding a match in the listings.
Stepping back, octals have a central spigot & eight pins 6A7 does not albeit that it has the same internals as a 6A8 & 2A7
Marc
|
|
|
|
Location: Brisbane, QLD
Member since 22 December 2014
Member #: 1672
Postcount: 13
|
Hi Marcc,
I've sent an close up photo of the sticker so it can be posted. But can confirm that the valve is a 42.
With the exception of the [4 pin??] 80, all the other valves are 6 pin without the centre spigot (forget what they were called)
Gary.
|
|
|
|
Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6678
|
Here are some candidates based on that line-up. I haven't checked all for console vs tabletop:
Make Year Model
Breville 1935 48 console
Calstan 1935 SS1
Sandel 1936 5G36 Byron
Sandel 1936 5G36 Milton
airzone 1935 576 Ch= 508
airzone 1936 552A
airzone 1936/37 566 Ch= 528
eclipse 1935 539 series
eclipse 1937 Croyden 569 Series
emmco 1934 454
emmco 1935 M455
stcaus 1936 511 Ch= 51
stcaus 1936 514 Ch= 51
weldon 1938 3/38
weldon 1938 3/38D
raycophone 1935 57E
|
|
|
|
Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7290
|
Please see this thread for a discussion on a similar radio - I finally found it.
The dial escutcheons are quite distinct though like those made by RCS Radio, they could be shared amongst more than one brand of radio.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...
|
|
|
|
Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6678
|
Good memory, Brad. No way I would have recalled that thread.
|
|
|
|
Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7290
|
I only remembered the dial escutcheon to be honest. The suggestions of what brand it was remained a mystery. I then remembered that I linked to a radio on Ebay and then searched for 'ebay' here. It raised quite a few results so there was still some looking to do.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...
|
|
|
|
Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5239
|
Irrespective of what is in it, that card shows us what should be in it and where. After it is identified & you get a circuit for it, the next thing to do is compare the two and make sure it has not been messed with.
Then you take clear sharp photos, of the inside of the pan, before anything is dismantled. That way you have something to refer back to, even if it has been hacked.
Clearly two valves are probably going to need repair if they test good. I normally test them before powering a set. In the set on the bench. I was looking for possible reasons why it had a dead section in the high tension secondary, The 6V6 tested as severely shorted & that may have been the smoking gun.
You do need to know the correct field coil resistance (from the circuit) and speaker transformer impedance: You just cannot plug in anything
The radio in the post referred to is not the same
Marc
|
|
|
|
Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6678
|
The radio in the post referred to is not the same
Yep, similar "upper" case but different valve line-up.
|
|
|
|
Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5239
|
Its more of an EMMCO style of layout that other console has four holes this three.
Note also trimmers in the front, not all did that and IF top trimmers so that should eliminate everything that shows slug tuners on the IF cans. Ask before adjusting them.
Marc
|
|
|
You need to be a member to post comments on this forum.
|