Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

Tech Talk

Forum home - Go back to Tech talk

 Airzone 1452A circuit
« Back · 1 · Next »
 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: 412

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.
TIA, JJ


 
 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: 1133

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: 412

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.
JJ


 
« Back · 1 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.