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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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11th Jan 2020, 3:59 pm | #1 |
Hexode
Join Date: Apr 2016
Location: Hayle, Cornwall, UK.
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Bush TV12/TV22 differences
My first television was a Bush TV22 with a band three converter
Just out of interest what was the difference between a TV12 and a TV22 Sharon Last edited by AC/HL; 11th Jan 2020 at 9:07 pm. Reason: Thread split |
11th Jan 2020, 4:03 pm | #2 |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,525
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Re: How Television Works
The most obvious differences were that the valve line-up was different, and the picture mask shape was more rectangular on the TV12. Others will probably add to this list.
Steve |
11th Jan 2020, 4:14 pm | #3 |
Hexode
Join Date: Apr 2016
Location: Hayle, Cornwall, UK.
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Re: How Television Works
Ah
Thanks very much Sharon |
11th Jan 2020, 6:23 pm | #4 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
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Re: How Television Works
I think the 12 uses the famous EF50 in the receiver. The EF91 took over in the 22 and later versions still went to EF80.
Peter |
11th Jan 2020, 6:56 pm | #5 |
Hexode
Join Date: Apr 2016
Location: Hayle, Cornwall, UK.
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Re: How Television Works
Hi Peter
Thanks very much for the info I remember my TV22 had a brilliant picture It had the original Bush Band three converter screwed on the back Pull the knob out and tune for ITV and push it in for BBC Can't find a pic of the converter Sharon |
11th Jan 2020, 7:29 pm | #6 | |
Dekatron
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Re: How Television Works
Quote:
There was a later version that retained the RF chassis, but used the later TV22 main chassis. Like the DAC90 (A) radio, the TV12/22 have become the iconic early 50's sets. They sold in large numbers due to price & reliability. Mark |
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11th Jan 2020, 7:57 pm | #7 |
Dekatron
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Re: How Television Works
Certainly a TV12 Bush if it uses EF50,s.
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11th Jan 2020, 8:19 pm | #8 | |
Dekatron
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Re: How Television Works
Quote:
Peter |
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13th Jan 2020, 1:48 pm | #9 |
Hexode
Join Date: Apr 2016
Location: Hayle, Cornwall, UK.
Posts: 375
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Re: Bush TV12/TV22 differences
That's the one Peter,
Medmories from 1961 Sharon |
13th Jan 2020, 2:09 pm | #10 |
Dekatron
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Re: Bush TV12/TV22 differences
The TV 12 was a TRF, the 22 a superhet.
Peter |
14th Jan 2020, 11:18 pm | #11 | |
Dekatron
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Re: Bush TV12/TV22 differences
Quote:
Another difference is the Aerial input, Belling-Lee on the TV12, but a saddle clamp on the TV22. Mark |
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15th Jan 2020, 12:35 am | #12 |
Octode
Join Date: Nov 2005
Location: Ayrshire, UK.
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Re: Bush TV12/TV22 differences
Wow....I didn't know that (along with the 30 trillion other things I don't know). I can envisage a TRF radio (in fact I made simple one) but the thought of a TRF television is quite a leap. Presumably the tuning is preset to one transmitter but did they stay in tune? TimR
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15th Jan 2020, 9:00 am | #13 |
Octode
Join Date: Jan 2003
Location: Birmingham, West Midlands, UK.
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Re: Bush TV12/TV22 differences
Yes, preset tuning, a red circular metal label around the aerial socket on the rf chassis tells you what it is tuned to. The TRF chassis is well designed and stable (give or take EF50 sockets). Of the three basic versions, I prefer the TV12AM, pretty red rf chassis of the '12 combined with the better performance (including focus stability) of the '22.
TTFN, Jon |
15th Jan 2020, 11:12 am | #14 |
Dekatron
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Re: Bush TV12/TV22 differences
The TRF models had to be stable all the coils were tuned to the transmitter frequency, plus or minus a little to give the necessary vision bandwidth. The TV12A was made for Alexandra palace, the only transmitter operating then. 45Mhz vision and 41.5 Mhz sound only they were Mc/s in those days.
Most of the TV's I worked on in the early days were TRF's. Peter |
15th Jan 2020, 11:23 am | #15 | |
Dekatron
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Re: Bush TV12/TV22 differences
Quote:
My TV12 was a very rough example, but turned out way better than I could have hoped for (see here: https://www.vintage-radio.net/forum/...d.php?t=122824). The quality of the TRF RF deck is superior to the later TV22, none of those nasty wax decouplers to deal with. Picture quality is very good indeed, no focus drift problems and very stable even after several hours viewing, I also think the sound quality is better too. Mark |
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15th Jan 2020, 1:34 pm | #16 |
Dekatron
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Re: Bush TV12/TV22 differences
The early ones were double sideband I believe, predating the vestigial transmissions.
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15th Jan 2020, 8:27 pm | #17 | |
Octode
Join Date: Nov 2005
Location: Ayrshire, UK.
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Re: Bush TV12/TV22 differences
Quote:
I guess the IFs were stagger tuned to provide the necessary bandwidth, especially for the sync. signal. How many transmitters were there in the early days? Presumably Alexandra Palace (Ally Pally)? Also, if you owned a set in the London area and then moved North, the television would be rendered useless?
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15th Jan 2020, 11:36 pm | #18 |
Dekatron
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Re: Bush TV12/TV22 differences
Pictures of the "Birmingham" TV12B.
DFWB. |
16th Jan 2020, 12:23 am | #19 | |
Octode
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Re: Bush TV12/TV22 differences
Quote:
Certainly some sets were made where components could be changed to work with the local transmitter.
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16th Jan 2020, 10:53 am | #20 |
Octode
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Re: Bush TV12/TV22 differences
Does the TV12 have a 5:4 aspect ratio? The one in the pic. (above) appears to.
(by the way... what's the Dr. Who connection?) |