On Friday, 9 February 2018 01:01:10 UTC, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Thursday, 8 February 2018 19:03:05 UTC, Chris Green wrote:
"Dave Plowman (News)" wrote:

On a modern car you might be amazed how much is powered up all the time.
My radio retains its station memory etc even if totally powered down.

Which doesn't actually need any power, flash memory retains its
contents with no power. Older radios used to use powered memory to
retain things but I'm not sure that modern ones do.

Older ones didn't have memories, they had valves. And at least some
proudly declared 'transistor' on the front regardless.

A decent one had a very clever push button system which did just the same
job as a station memory. But must have cost a fortune to make.

those tuners were standard in B&W TVs for a long time. Not a turret tuner, I can't remember the name. OK until there are more radio stations, then you wish for a simple knob.

The were hybrid ones which used a transistor power amp and 12v HT for the
RF valves. Getting rid of that irritating vibrator.

That's what mine is, a basic 1 transistor class A amp.


NT