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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 2nd Apr 2020, 9:45 pm   #21
FERNSEH
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Default Re: The Ever-Ready experimental transistor TV set.

Hi Ed,
How about the later AD149? Still got few in stock.

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Old 3rd Apr 2020, 10:42 am   #22
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Default Re: The Ever-Ready experimental transistor TV set.

Hello David, page from the Ever Ready book. It shows the HP1 12v battery that must have been the TV1 suggested for other uses.John.
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Old 3rd Apr 2020, 11:28 am   #23
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Default Re: The Ever-Ready experimental transistor TV set.

Measured the battery compartment. It is 63 X 130 X 133mm. The HP1 will be a tight fit.

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Old 3rd Apr 2020, 12:52 pm   #24
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Default Re: The Ever-Ready experimental transistor TV set.

DFWB
The AD149 has a lower VCB @ 50v
OC35 VCB 60V VCE 32V VEB 20V IC 8A
OC36 VCB 80V VCE 32V VEB 40V IC 8A
I can let you have an OC36 that tests good on my Peak tester if you PM me your address.
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Old 3rd Apr 2020, 5:45 pm   #25
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Default Re: The Ever-Ready experimental transistor TV set.

Hi Chris,
I've sent you a PM.

DFWB.
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Old 4th Apr 2020, 12:58 pm   #26
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Default Re: The Ever-Ready experimental transistor TV set.

I seem to remember that Ever-Ready made a TV battery that was a rechargeable 12V alkaline battery. Found it https://www.radiomuseum.org/r/everea...table_564.html

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Old 4th Apr 2020, 3:11 pm   #27
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Default Re: The Ever-Ready experimental transistor TV set.

The Philco Safari transistor portable TV set employed an internal rechargeable battery.
Introduced 1959 the Safari was the World's first truly portable TV set.
https://www.radiomuseum.org/r/philco_2010_safari.html

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Old 17th Apr 2020, 11:26 am   #28
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Default Re: The Ever-Ready experimental transistor TV set.

Thanks to the kind donation by a forum member of an OC36 transistor it was possible to recommence the restoration of this unique TV set.

The attachments show the latest results. Noteworthy is the very low power consumption which varies between 0.25 to 0.3amp. Receiver will perform on supply voltages between 8 to 12volts.

DFWB.
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Old 17th Apr 2020, 11:31 am   #29
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Default Re: The Ever-Ready experimental transistor TV set.

Excellent! And only 3.6 watts consumed. That's about a tenth of what my Radiomobile 100 car radio draws.

Peter

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Old 17th Apr 2020, 11:44 am   #30
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Default Re: The Ever-Ready experimental transistor TV set.

Great to see it working again, they obviously did a fine job of keeping the consumption down for battery operation.
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Old 17th Apr 2020, 11:48 am   #31
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Default Re: The Ever-Ready experimental transistor TV set.

That's quite astonishing. Producing a decent TV picture on a 7" screen with just 3 watts is quite an achievement. Their designers/engineers must have been a rare bunch.
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Old 17th Apr 2020, 12:04 pm   #32
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Default Re: The Ever-Ready experimental transistor TV set.

The Ever-Ready TV set was possibly designed by the same Thorn Electrical Industries team that created the BRC 2000 and 3000 CTVs.

The design of the power supply in the E-R TV is simple and very effective. The output voltages are maintained over a wide range of input voltages.

It's a pity the set wasn't put into full production. It would have been a sales success I'm absolutely sure about that.

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Old 26th Apr 2020, 6:32 pm   #33
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Default Re: The Ever-Ready experimental transistor TV set.

Hi David,
great work and what a nice set to have.

Can you post a picture or two of how the set looks in its cabinet?

Cheers
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Old 26th Apr 2020, 9:47 pm   #34
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Default Re: The Ever-Ready experimental transistor TV set.

Great work!

Definitely a TV that deserves to exist, in a working condition. As others have commented, getting this sort of result from only a few watts is an amazing achievement by the designers.
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Old 27th Apr 2020, 7:56 am   #35
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Default Re: The Ever-Ready experimental transistor TV set.

That is quite amazing David. The picture is a good shape and CRT face looks completely flat. The T.E.I./BRC design team must have been the most advanced best in the industry. Together with PYE they designed almost every technical mile post in television during the 1950's and 60's.
Nice one, John.

PS I must get my Ferguson 'Transvista 7" 743T on the bench. Internally it is very clean and original but some of the minor cosmetic bits are missing. Rare but nothing like as rare as your Ever Ready.
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Old 27th Apr 2020, 9:10 am   #36
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Default Re: The Ever-Ready experimental transistor TV set.

Great to see such a unique TV showing pictures again. I couldn't agree more, a real pity they didn't get into production. At just 3 Watts consumption, what would the likely battery life be?
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Old 27th Apr 2020, 11:02 am   #37
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Default Re: The Ever-Ready experimental transistor TV set.

Found that the HP1 has a capacity of 8300mAh, 300mA gives about 27 hours. My iPad will do 10, progress eh!
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Old 27th Apr 2020, 5:47 pm   #38
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Default Re: The Ever-Ready experimental transistor TV set.

According to the article in the December 1964 Practical Television magazine 40 hours of use is possible from the TV1 battery.

"Reduction of the power demand to about 3 watts made possible the use of batteries from Leclanche cells of a new construction giving about 40 hours use, at two hour daily periods. The prototype Mark 5 is a 405-line receiver, and the extra circuitry required for dual-standard operation will increase consumption to 3.3 watts."

The power supply operates by producing an oscillation with a duty cycle of 2mS. The mark-space ratio varies according to battery voltage and current demand.

The Ferguson sourced signals panel is still giving problems. Sync pulse crushing at moderate contrast control settings. The 'scope shows that the video developed across the vision detector load resistor has the sync crushing condition. The first IF amplifier transistor will be checked first, good chance the AF114 has the tin whiskers fault.

DFWB.
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Old 27th Apr 2020, 5:56 pm   #39
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Default Re: The Ever-Ready experimental transistor TV set.

All this begs the obvious question - why were the first mainstream portable TVs (say the Thorn 1591 series) so power hungry?
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Old 27th Apr 2020, 5:57 pm   #40
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Default Re: The Ever-Ready experimental transistor TV set.

Quote:
40 hours of use is possible from the TV1 battery
I wasn't that far out, Lechanche cells do recover somewhat after a rest so 40 hours isn't unbelievable. For comparison the Sinclair FTV1 took 100mA at 6V (600mW) for a much smaller 2" screen.
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