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 Airzone 1452A circuit
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 Return to top of page · Post #: 1 · Written at 4:55:18 PM on 5 July 2020.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 429

Has anyone got the circuit for an airzone 1452A.
Valve line up 6A8G, 6U7G, 6B6G, 6F6G, 5Y3G.
Radiomuseum shows an 1652A with same valve line up, and looks identical. Console cabinet as well.
But no circuit available for it either.
Need some component values around the local oscillator circuit as its reluctant to oscillate and stops when powered through the "dim lamp" test circuit.
So a reduction in main HT rail of around 20 volts stops the oscillator.
Have not tried the valve yet, as I need to find one first.

 Return to top of page · Post #: 2 · Written at 6:27:21 PM on 5 July 2020.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1136

There is a slight difference in cabinet styling between the 1452A & 1652A. I'm guessing that they use the same chassis.

Check out model 1152A. It is the previous seasons model (1940), but has the same valve line-up as you have mentioned.

 Return to top of page · Post #: 3 · Written at 7:47:05 PM on 5 July 2020.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 429

Yes, Thanks Monochrome TV.
The 1152A chassis is as far as I can see identical.
Have downloaded circuit and done some comparisons and looks good.
Even gives expected voltages around the converter/oscillator 6A8G.
Spent an hour searching the net for something similar, to no avail.
Thanks again, now have to wait for another rainy day so I can hide in my workshop and sort this one out.

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