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 Airzone Cub
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 Return to top of page · Post #: 1 · Written at 12:12:54 AM on 31 May 2011.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3814

I do have questions about a 6J8 & 6A8 especially in 1933

6B8 reflexed perhaps? not 6J8. The two pentagrids will interchange, however do not expect the same result.

There was a white radio recently with a missing converter, which I believe is a 6AN7?

Marc


 
 Return to top of page · Post #: 2 · Written at 3:38:02 AM on 31 May 2011.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5309

Stokes has the 6A8 as a successor to RCA's 2A7 of 1933, which he says remained popular for many years.

He has the 6J8G as being released by Raytheon and Sylvania in 1937.

So, yes it would be interesting to know the original line up for that 1933 Cub.


 
 Return to top of page · Post #: 3 · Written at 10:42:53 AM on 31 May 2011.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3814

My interest is in the fact that it is very rare (not unheard of) to see a set with two pentagrids, yet alone one that was not released in Australia at the time.

Thats why I suspect 6B8 as it was common in reflexed sets

Marc


 
 Return to top of page · Post #: 4 · Written at 3:00:48 PM on 31 May 2011.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5309

Was 6B8 around in 1933?


 
 Return to top of page · Post #: 5 · Written at 8:21:53 PM on 31 May 2011.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3814

WD scarpered off with a lot of them during the War causing a few radio's to change to a Philips equivalent (use what is gettable or perish).

It may not have been as 6B8 but 6B7 which is the same thing with a different base. 6A7 is the same as 6A8 with a different base 6D7 became a 6J7, 6D7 a 6U7.

Several valves just had different heaters and were renumbered 2A7 and 6A8.

Marc






 
 Return to top of page · Post #: 6 · Written at 9:22:28 PM on 31 May 2011.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5309

I'd have expected all of the tubes in a set designed in the very early 1930s to have UX type bases, however I guess with shortages due to the economic circumstances of that time it was case of use whatever you can get.

Unless perhaps it has been re-socketed over the years?


 
 Return to top of page · Post #: 7 · Written at 10:47:25 PM on 31 May 2011.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3814

America was already using octals by the mid 30's we were behind them (what's new) and still using mainly six & seven pin by then.

I did sort out an EMMCO Autodyne of the early 30's and that had five & six pin valves. Only the 80 (later 5Y3) had four pins. Converter in those is a Pentode

And speaking of Devils: Bandmaster 197DE uses a 6L7 Pentagrid in the audio.

Marc


 
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