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 Astor Mickey OZ circuit variations over the production period, 1933 – 1935
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 Return to top of page · Post #: 46 · Written at 8:23:46 PM on 19 January 2026.
STC830's Gravatar
 STC830
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 1400

My mistake, you need a 43 not a 42. Alas, I have t'other, but not the one.
 
 Return to top of page · Post #: 47 · Written at 10:16:26 PM on 19 January 2026.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5692

That could have been interesting #43 which became 25A6 Octal, has a 25V heater #42 6.3V.

In my collection of unsorted & untested tubes there is a #43 condition unknown but I do have an operational Paton VCT & a Knight 600.
 
 Return to top of page · Post #: 48 · Written at 11:35:37 PM on 19 January 2026.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5692

Patton VCT says my #43 is not shorted, but the emission, set per VCT's original paper work, indicates that its very low. Around 30%
 
 Return to top of page · Post #: 49 · Written at 7:39:57 AM on 20 January 2026.
Hot Filiment's Gravatar
 Hot Filiment
 Location: Castle Hill, NSW
 Member since 17 January 2025
 Member #: 2698
 Postcount: 46

Thanks STC, for looking and I do not believe there is an easy replacement, I found a 43 on Ebay and I will try the HRSA valve bank.

Hi Marc, I appreciate you testing yours and if I fail to find one soon I will come back to as even a low emission will help me get this radio singing again. The circuit so far is not exactly following the schematic that I was given for S\N in the range of mine.
 
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