Looking for 1930's "Majestic Radio" schematic
Engineer
A while back I acquired a basket-case Canadian Rogers-Majestic radio
at an Ontario Vintage Radio Association meeting.
Can anyone point me to a schematic? I can't find it on my RCC or
Beitman/Rider CD's.
It's a table-top, wood cabinet radio, called on the label "Majestic
Radio, type 59, s/n 59-1380", and has a round dial. Label also says:
"115 volt 0.5A, 25-60 Hz". Tubes line up is:
6A8 converter (metal, top cap)
____8? IF (metal base, straight glass sides, top cap) - can't read
number
6Q7G detector, AF
41M output (classic Rogers metallised, unfortunately dead!)
80 rectifier
Field coil speaker.
The tuning capacitor has three gangs but, AFAIK, there's no RF stage
(without the schematic I've done no forensics beyond the above.)
I'd say it was 1930's manufacture, perhaps middle or late, definitely
pre-WW2.
All leads gratefully received, thanks in advance.
Cheers,
Roger
PS. email address shown is an anti-spam fake. My address is
analogdino at(ta-boy) rogers dot(ty-as-they) com(e)... suitably
decoded.
Kenneth Scharf
least not on the page specified. Are you sure about the chassis number,
it seems like a digit is missing, most of the numbers below 100 are VERY
early with UX2xx series tubes.
Engineer
(snip)
> It's listed in the Beckmans index, but the schematic isn't there, at
> least not on the page specified. Are you sure about the chassis number,
> it seems like a digit is missing, most of the numbers below 100 are VERY
> early with UX2xx series tubes.
Ken, definitely only a two digit type number, viz: 59.
Other stuff from the chassis plate:
"Manufactured by Rogers Majestic Corporation Limited Toronto Canada"
"Patented 1916 to 1932 inclusive"
"Licensed under Hazeltine Corporation Canadian Patents issued and
pending 1923 to 1935 inclusive"
Tubes are octal except for the 80 rectifier having the old 4-pin base.
So, we know it's later than 1935! ... and Canadian, eh?!
Cheers,
Roger
oi...@nexicom.net
are 6A7M, 88M, 6B7M, 41M & 80.
Ed.
Engineer
Thanks, Ed. However, the tubes are definitely 6A8 (converter, metal,
top cap), ___8? (IF, metal base, straight glass sides, top cap - can't
read
number. But could this be an 88M? Unlikely, as my tube is not
metallized ), 6Q7G (detector, AF), 41M (output, classic Rogers
metallized, unfortunately dead!) and 80 (rectifier), so they don't
quite fit the MYE data. I've not checked if these are substitutes.
MYE (Mallory-Yaxley Radio Encyclopedia) is not my usual source but
might be useful to look at. Where might I find this?
Anyway, could anyone scan and email me page 16 for type 59?
Cheers,
Roger
email: not as shown, please use analogdino at(ta-boy) rogers dot(ty-as-
they) com(e)... suitably decoded. Thanks.
nesesu
Seems to me that Rogers took the 'large pin' tubes, put on an octal
base and metallized them then numbered them with the old number with
an added 'M'. Fortunately, they mostly used the 'proper' pin-out so a
6A8 is an exact sub for the 8A7M EXCEPT that the cap is bantam rather
than large. I think an 88M can be subbed with a 6K7 and a 6B7M with a
6Q7. The 41M can be subbed with a 6K6.
Neil S.
Engineer
Neil, all useful stuff (as usual.) Thanks for the Rogers tube
substitute docs received.
This project is on hold until I fix a tube amp, do another (easier!)
AM radio, sort out all my tubes (aaargh...!), clean up the workshop to
get some space, fix a tube tester, sort out my junk from collectable
stuff, then if I've the energy I'll start on it!
Cheers,
Roger
philsvintageradios
>
> - Show quoted text -
check the cabinet for numbers ( an ink stamp) not just the chassis
plate.
I look after the forum for the Canadian Vintage Radio Society , you
could post there. For paid members of the CVRS we have a schematic
service so you could possibly look into that if you haven't
Phil