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 Crown Radio Information
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 Return to top of page · Post #: 1 · Written at 10:08:37 AM on 10 September 2019.
Rudolf's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 739
 Postcount: 141

Would anyone have any information on an Australian Crown Radio, valve line up 80 - 2A5 - 2B7 - 57 - 57 ? There are no markings on the chassis anywhere.

Crown Valve Radio
Crown Valve Radio
Crown Valve Radio


 
 Return to top of page · Post #: 2 · Written at 11:47:26 AM on 10 September 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3616

It is most likely they did not assemble it. "Radio Trade Annual"; Lists them as wholesalers & manufacturers of Components, Kitsets and Coil sets. That is a very common valve lineup.


 
 Return to top of page · Post #: 3 · Written at 12:37:18 PM on 10 September 2019.
Rudolf's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 739
 Postcount: 141

Looks like it was a kit according to the write up on Radio Museum.

https://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=18404


 
 Return to top of page · Post #: 4 · Written at 10:08:17 PM on 10 September 2019.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 5386

Photos uploaded. That's a very tiny loudspeaker for a 1932-ish radio. Undoubtedly quite rare, with an unusual speaker grille.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 5 · Written at 9:40:46 PM on 11 September 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3616

Something does not gel with me on that radio. 2A5 was upgraded with a new heater & base and became 6F6. With the right amount of volts is was good for close to 5 Watts RMS.

Two #57's looks wrong. #57 was reincarnated as 6J7 and was used as the Autodyne converter / mixer (Screen Grid Radio) and often as a plate detector. The latter it will not be, as that's what the 6B7 is doing, using diode plates.

Normally the IF amp for nearly everything was the cranky when not shielded #58 (It also had heater & base changes & became 6D6 and 6U7) Whilst these are pin interchangeable; One is a "sharp cut off" Pentode, the other "remote cut off".

With 6B7 it may actually have AGC / AVC and using the wrong valve will upset it.


 
 Return to top of page · Post #: 6 · Written at 8:30:53 AM on 12 September 2019.
Rudolf's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 739
 Postcount: 141

I'm only the messenger presenting it as I found it.
I think you meant 2A5 became a 6F6 ?

Crown Valve Radio
Crown Valve Radio
Crown Valve Radio
Crown Valve Radio


 
 Return to top of page · Post #: 7 · Written at 9:22:52 AM on 12 September 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3616

Fixed 2A5: If it is to be refurbished & not become a shelf queen, it is important to highlight that which looks odd as that may cause its actual, or the one it was based on: Missed.

When one has refurbished, or repaired several hundred radios since the sixties, one gets to know the common faults in models, and that most followed a similar plot, several models and brands came out the one factory and parts also came from all over the place. Groups like EMMCO were one that made parts for communications like Electrical meters and Telephone bits plus assembled several brands including their own. EMMCO circuits are rare and I had to reverse engineer some of them and an STC where even the HRSA could not find a circuit. They have now: With appropriate warning on it, as to how it was derived.

The actual parts can tell a story. Those top trimmer IF's will not be common to all radios as some (EMMCO) often had the trimmers in the base, The Philco here has Slug tuned: Slugs orientated horizontal. The tuning gang is not like the more common Stromberg-Carlson, or AWA made ones.

This of course does not mean that the actual circuit is not common to several set models. Many of the plastic Mid to late 50"s HMV "Nippers" just had different cabinets. And a crazy change to the screen resistors in the front end: R22 in early ones from memory. Badge engineering was rife and still is.


 
 Return to top of page · Post #: 8 · Written at 12:24:23 PM on 14 September 2019.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 5386

Photos uploaded to Post 6.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
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