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 Ex Drive In AM Transmitter
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 Return to top of page · Post #: 1 · Written at 9:41:34 AM on 6 September 2020.
Kakadumh's Gravatar
 Location: Darlington, WA
 Member since 30 March 2016
 Member #: 1897
 Postcount: 150

Hi All,

Am having a bit of a clean out of unwanted gear and amongst the stuff is a Meisei Electric Co Ltd CF-501 AM Transmitter that covers the Aust AM band with a vernier dial to select frequency.

Output I think was only a few watts...maybe 5 at best and was used to provide Cine Fi Audio to drive in cinemas where the speakers were all removed and replaced with a stretchy bit of wire that one popped over the car antenna and BINGO you had quite good radio reception of the movie soundtrack...albeit MONO only.

As Stereo soundtracks arrived the Cine Fi gear was pensioned off for small FM transmitters again at around 5 Watts and cars with good stereo receivers then had great in car stereo sound.

This transmitter is 110V input for the mains and comes with the Divider unit (CT-701) and the Ramp Splitter unit (CF-801c) mounted on a
19 " rack mount plate as is the transmitter which is in VG physical shape as being very well made by the Jap Company Meisei I believe.

FREE to a good home you pay the freight from WA otherwise its off to the rubbish tip with it. My Email is unhidden.

Lindsay


 
 Return to top of page · Post #: 2 · Written at 11:01:44 AM on 6 September 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5997

Interesting piece of drive-in history. Some photos would be great for posterity.


 
 Return to top of page · Post #: 3 · Written at 2:32:45 PM on 6 September 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6333

I remember those clips for the radio antennas. I guess the theatres were tired of people driving away with the loudspeakers still tucked inside their windows. Shock


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 4 · Written at 2:58:17 PM on 6 September 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4329

I think the original one at the drive in here outputted PP #807's?


 
 Return to top of page · Post #: 5 · Written at 3:30:34 PM on 6 September 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5997

^ Would not be surprised if they used 807s -- they were everywhere.


 
 Return to top of page · Post #: 6 · Written at 5:06:53 PM on 6 September 2020.
Kakadumh's Gravatar
 Location: Darlington, WA
 Member since 30 March 2016
 Member #: 1897
 Postcount: 150

I think you might find that the 807's were just used in the normal 100V audio line feeds to the ramps as by the time Cine Fi came along transistors were all the go but transistorised amps feeding 100V lines reticulated around the drive in ramps did NOT like lightning at all.
A couple of DI 's that I know of converted to the semi conductor amps only to get some nasty surprises of NO Sound after a thunderstorm had gone through.
Some went back to using valve amps but with more modern valves at the time such as KT66 etc. I used to service a country drive in sound system that had three hefty valve amps with 4 x KT 66 in parallel push pull with 650V on the anodes. They could do 100W RMS for 24 hours on test and barely get warm.
I treated those babies very carefully as the 650V DC was nasty stuff.

Will see I I can get some photos sorted of this Cine Fi gear just for the record.


 
 Return to top of page · Post #: 7 · Written at 10:37:43 AM on 7 September 2020.
BurntOutElectronics's Gravatar
 Location: Melbourne, VIC
 Member since 2 October 2019
 Member #: 2392
 Postcount: 154

Is it still available? thanks


 
 Return to top of page · Post #: 8 · Written at 10:51:05 AM on 7 September 2020.
Kakadumh's Gravatar
 Location: Darlington, WA
 Member since 30 March 2016
 Member #: 1897
 Postcount: 150

Hi Burnt Out Electronics,

Redxem has contacted me re possibly acquiring it subject to the freight cost to NSW etc.

Photos have been taken and sent to Brad to upload and I need to weigh the thing and get a quote on freight for Redxem.

Will keep you posted.

Lindsay

Update...9/9/20

All packed and ready to despatch to Redxem out near Tamworth..sounds like it has found a good home.

Lindsay


 
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