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 AWA 453PZ
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 Return to top of page · Post #: 1 · Written at 6:19:01 PM on 24 July 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

Hi guys I have sent some photos of this to Brad. The battery wires on one plug has been hacked a bit on the 90 volt section . Just wanting to see if you could help me clarify them. The plug for the 1.5 volt supply looks like it's coming from a strange place as well.

AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio
AWA 453PZ Portable Valve Radio


 
 Return to top of page · Post #: 2 · Written at 8:08:11 PM on 24 July 2017.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4342

Could only spot 453P On it the "A" battery is Negative earth and the B seems to have some form of back bias as "B-" goes to ground via a 400 Ohm resistor.


 
 Return to top of page · Post #: 3 · Written at 11:28:52 PM on 24 July 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

When you see the photos I sent , you will see a few wires with out a plug , obviously the plug has been removed , but why ? , I don't know.


 
 Return to top of page · Post #: 4 · Written at 11:52:53 PM on 24 July 2017.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4342

I don't find that at all unusual, sounds rather tame. It is incredible what has turned up here at times, under the heading of "can you fix this"?

I have see some incredible hacks; From idiotic failed modifications, to one where the field coil was removed with a cold chisel & put back on with a stick welder. Two had been powered with mains cables that were a series of 3/16" beads.


 
 Return to top of page · Post #: 5 · Written at 8:47:53 AM on 25 July 2017.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6012

the plug has been removed , but why ?

If you are referring to the battery plug then, at a guess, it may have been pinched for another set. Those plugs are unobtanium.


 
 Return to top of page · Post #: 6 · Written at 9:33:59 AM on 25 July 2017.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4342

Not sure about unobtanium. America still produces some of those batteries (for a price) and I have a feeling that I have seen new plugs. No 6 cells are still with us here.

This is one of them for an example:

https://retrovoltage.com/2015/05/21/need-45v-batteries-for-your-old-radio/


 
 Return to top of page · Post #: 7 · Written at 9:42:42 AM on 25 July 2017.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6012

Yes, am familiar with batteries, but the question goes to plugs.

If someone is making repro plugs, then a link would be useful.


 
 Return to top of page · Post #: 8 · Written at 10:12:48 AM on 25 July 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1905

OK, you have 4 wires for the B battery and two for the A battery. You'll need an ohm-meter.

Starting with the power switch OFF:

"A" battery wires (red and black).

Confirm that the black wire measures zero ohms (or close) to the chassis. That's your A-
The red wire is A+, it goes to the power switch wafer.

"B" battery wires (Orange, White and two Blues)

Firstly, two of these wires will be connected together. Check for this first with your ohm-meter, you can rule them out, they are the link between the two B batteries.

Another wire (probably the remaining blue one) will measure 400 ohms to chassis. That is your B-

The remaining wire (orange or white?) is your B+ which goes to another terminal on the power switch wafer.

Sorted!

That's an interesting radio, it has short wave? The 453P does, I'm assuming the 453PZ is a later revision to the same design.


 
 Return to top of page · Post #: 9 · Written at 1:37:09 PM on 25 July 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

Yes it is a very interesting radio. The two B battery plugs are actually intact . The A battery plug is not. But there are two other wires as well which is confusing. I know thw radio has the option of running on a lower power as it has a medium and full setting on the on/off switch. you will see the wires in question when the pictures are up.

I have had time to study the service manual for this so thats why I have said that the 90volt plugs are ok and I have identified the a battery wires but what are the blue and white wires.


 
 Return to top of page · Post #: 10 · Written at 3:18:08 PM on 25 July 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1905

The blue and white wires are the link between the two 45 volt batteries to connect them in series to get 90 volts. You can confirm this by measuring ohms between them - you should get close enough to zero.

If so, you can safely ignore (don't connect) them (unless you want to use two original 45 volt batteries that is.)


 
 Return to top of page · Post #: 11 · Written at 5:45:06 PM on 25 July 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

What sort of threw me was one of the 45 volt plugs was coming out on top of the chassis and the other is under the chassis . After looking at the schematics and reading your explanation now it has come clear that there really is no issues.
At least I hope so lol.


 
 Return to top of page · Post #: 12 · Written at 7:37:36 PM on 25 July 2017.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6349

Photos uploaded.


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

 
 Return to top of page · Post #: 13 · Written at 10:29:23 PM on 25 July 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1905

Solved the mystery of the model numbers....

The 453P is a dual-wave set with an RF stage.
The 453PZ is a MW only set with an RF stage.

When you look at the manual you'll see why the battery plug wires appear in funny places. It's to do with the relative positions of the batteries.


 
 Return to top of page · Post #: 14 · Written at 1:56:59 AM on 26 July 2017.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1133

The 453P is a dual-wave set with an RF stage.
The 453PZ is a MW only set with an RF stage.


No, that is not correct. Both 453P & 453PZ are the same & both have short-wave. It is the 452P that is the broadcast only version.

With the AWA model designation system the "Z" indicates the first version or first change. These changes could be minor cosmetic or electrical. Any subsequent changes will be shown as Y, X, W, etc.


 
 Return to top of page · Post #: 15 · Written at 7:08:50 AM on 26 July 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

It actually has a shortwave switch down on one the sides. I am now looking forward to powering this one up.


 
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