Quick question - when removing radiators from their tails (or other
compression fittings using olives) - should you replace the olive when you
do it up again? I've never really had to consider this before, and I just
want to make sure before I start putting things back together again!
I'm puzzled... As the olive practically cold welds itself to the pipe, how
are you supposed to get it off?
AFAIK you can undo and tighten up compression fittings as many times as you
I've never heard of any requirement to replace olives each time.
You get it off by *very* carefully hacksawing a slot in the olive,
insert a big screwdriver and twist, it pings off. But if you nick the
pipe with the saw you will never get the new joint to seal. So I think
you are better reusing the old olive & I don't see any reason not to.
Me too, although mine was built about 3 years later as a project after
I'd finished A levels and was bored.
IIRC, there was a design for it in one of the electronics magazines.
The TTL counters and especially the decoder/drivers for the tubes were
pretty expensive and one had to be careful to avoid blowing them up
with the 180v or so used to drive the tubes.
I added an alarm and a relay to mine with comparator logic and some
thumbwheel switches. Later I changed to a quartz oscillator for the
The whole thing fitted into a case a little bit smaller than a breeze
It worked well then and still works today......
To email, substitute .nospam with .gl
I designed mine from scratch around components I could get hold of cheaply,
as TTL was very expensive back then. I seem to remember I bought a lot of
components from a company called BiPrePak, based in Ware, Herts. They used
to supply big packs of 50 or more assorted 'fall out' devices for about 10
bob. The devices mainly worked but had outputs missing/not connected or the
parts were mis-marked. Half the fun was getting something working out of
that pile of bits!
I worked in the electronic maintenance department of Mullards, on
shiftwork. I remember they had 4 big metal cabinets containing
essential components for repairing shop floor equipment which only the
maintenance staff could get the keys for.
Always empty of any useful components as I recall. Memories are very
dim now but I believe there were some damn good stereo systems, metal
detectors and even the ping-pong TV tennis games which were just
appearing in the mid-70's made from those components.
Allegedly. I wouldn't want anyone to get the idea that I knew this was
going on.....we were usually far too busy playing 3 card brag as soon
as the day shift went home ;)
I recall a very similar experience.
Then there were always the respresentatives from the manufacturers who
were dying to have their components designed into products.
Generally it cost them a few samples of non related components for
home office projects.
To email, substitute .nospam with .gl
Good grief, it really is "hobby electronics reunion" time here on uk.d-i-y ;-)
I remember the name as "BiPak" rather'n "BiPrePak", but you may well be
right. It was them, and John Bull (who are still going, selling any
amount of surplus electronics and nudge-nudge hydroponics and discharge
lighting kit ;-) with their "Bargain Packs" of semi-discarded components
and subassemblies, which were the main source of dodgy components for
dodgy projects when I were a lad. Only remember one mains tingle, from
the Cool Lighting FX box from a Practical Electronics design, where
an oscillator ran at an adjustable frequency just south of 50Hz to control
a thyristor (pre-triac days, if I remember aright, so very dim light
output!) to give Just Like TopOfThePops fading up and down at various
speeds. Ah, the fun we had before Health&Safety were inventured ;-)
Yep, when I worked for Ferranti in the mid 1970's the reject transistors
used to come through my London office on their way to BiPak in tea-chests.
Zillions of E line BC109 equivs that were mainly low gain or leaky.
Sure is... Now, IIRC, there was a Bi-Pak, and a Pre-Pak, as well as
Bi-Pre-Pak, all competing for the most prominent advert in Practical
OOI, who remembers the radio/electronic shops in Birmingham in the 60s?
Chas. H. Young in Corporation St., and the three emporia in Hurst St. -
Norman H Field, Radiocentre, and the one on the other side of the road whose
name I've forgotten. Between them they took most of my surplus pocket
money. Somewhere I've still got the Sinclair X-10 amplifier that I bought
in NHF. It's probably a collector's item by now...
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.