"Ian Bell" wrote

I had some of those too. There were also green spot rf ones. I still have
a red spot one. Must be worth a fortune now ;-)


If they are worth a fortune I'm sitting on a gold-mine here!

David.

In article , David Looser
wrote:
"Ian Bell" wrote

I had some of those too. There were also green spot rf ones. I still
have a red spot one. Must be worth a fortune now ;-)


If they are worth a fortune I'm sitting on a gold-mine here!

I think I have some old 'Newmarket' (if that was the name) transistors.
Maybe if these kinds of things are now 'historic relics' I should dig some
of them out... :-) IIRC they are still in the corrugated cardboard in the
boxes in which they were bought.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

On Tue, 15 Dec 2009 12:18:39 +0000, Jim Lesurf wrote:

In article , David Looser
wrote:
"Ian Bell" wrote

I had some of those too. There were also green spot rf ones. I still
have a red spot one. Must be worth a fortune now ;-)


If they are worth a fortune I'm sitting on a gold-mine here!

I think I have some old 'Newmarket' (if that was the name) transistors.
Maybe if these kinds of things are now 'historic relics' I should dig
some of them out... :-) IIRC they are still in the corrugated
cardboard in the boxes in which they were bought.



Would those be the ones in the flat cans with yellow & green spots for
audio and a red spot for RF, Jim?

Interesting page for flat cans:
http://homepages.nildram.co.uk/~wylie/NKT/newmarket.htm

Another for "top hat" cans:
http://homepages.nildram.co.uk/~wyli...an/Ediswan.htm

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info
Filtering everything posted from googlegroups to kill spam.

mick wrote:
On Tue, 15 Dec 2009 12:18:39 +0000, Jim Lesurf wrote:

In article , David Looser
wrote:
"Ian Bell" wrote
I had some of those too. There were also green spot rf ones. I still
have a red spot one. Must be worth a fortune now ;-)


If they are worth a fortune I'm sitting on a gold-mine here!
I think I have some old 'Newmarket' (if that was the name) transistors.
Maybe if these kinds of things are now 'historic relics' I should dig
some of them out... :-) IIRC they are still in the corrugated
cardboard in the boxes in which they were bought.



Would those be the ones in the flat cans with yellow & green spots for
audio and a red spot for RF, Jim?

Interesting page for flat cans:
http://homepages.nildram.co.uk/~wylie/NKT/newmarket.htm

Another for "top hat" cans:
http://homepages.nildram.co.uk/~wyli...an/Ediswan.htm


Those are the ones i have - XA101 and XA102. Ediswan, now there's a name
to conjure with.

Cheers

iaN

In article ,
mick wrote:
Would those be the ones in the flat cans with yellow & green spots for
audio and a red spot for RF, Jim?

IIRC, it was white spot for RF, green/yellow for IF and red for audio.

--
*Why are a wise man and a wise guy opposites? *

Dave Plowman London SW
To e-mail, change noise into sound.

On Sat, 19 Dec 2009 00:21:41 +0000, Dave Plowman (News) wrote:

In article ,
mick wrote:
Would those be the ones in the flat cans with yellow & green spots for
audio and a red spot for RF, Jim?

IIRC, it was white spot for RF, green/yellow for IF and red for audio.


Quite possible, Dave. I've not had anything to do with those thingies for
many years! I remember that the black glass transistors were red spot for
AF and white spot for RF. Dunno about the flat cans though. I did have a
couple for a while though (and might still have somewhere!)

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info
Filtering everything posted from googlegroups to kill spam.

In article , mick
wrote:
On Tue, 15 Dec 2009 12:18:39 +0000, Jim Lesurf wrote:


I think I have some old 'Newmarket' (if that was the name)
transistors. Maybe if these kinds of things are now 'historic relics'
I should dig some of them out... :-) IIRC they are still in the
corrugated cardboard in the boxes in which they were bought.



Would those be the ones in the flat cans with yellow & green spots for
audio and a red spot for RF, Jim?

Interesting page for flat cans:
http://homepages.nildram.co.uk/~wylie/NKT/newmarket.htm

Another for "top hat" cans:
http://homepages.nildram.co.uk/~wyli...an/Ediswan.htm

Crumbs! People have webpages for everything! :-)

Afraid that at the moment I'm not sure which types they are. Not looked at
them for ages.

I think they are in metal cylindrical cans with no flange. They are in a
drawer 'at work'. All being well I'll be popping in to work next week
before Xmas to give good wishes and borrow an oscillator. If I remember
I'll have a look and report what they are. They are part of a stock of ye
anciente components that somehow were left over from days or yore. Never
throw anything away.... I still have a PX4 or 25 IIRC that I use to show
undergrads what electronics used to be like in the days before even *I*
were a lad! :-)

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

"Jim Lesurf" wrote

.. I still have a PX4 or 25 IIRC that I use to show
undergrads what electronics used to be like in the days before even *I*
were a lad! :-)


You mean you aren't using it in an SET amplifier? That'd be *real* HiFi that
would!



David.

In article , David Looser
wrote:
"Jim Lesurf" wrote

. I still have a PX4 or 25 IIRC that I use to show
undergrads what electronics used to be like in the days before even
*I* were a lad! :-)


You mean you aren't using it in an SET amplifier? That'd be *real* HiFi
that would!

The one I have is 'gassed' so doesn't work. I did have a number of old
valves, including PX4 and PX25 types. But over a decade ago I
sold/exchanged the ones that were OK rather than have them sitting doing
nowt when there were clearly people who wanted to use them. Just kept a few
examples for 'educational examples' or as spares for a few valve items I
have.

That said, I did have one of my summer project students once develop a
single-ended transistor amp that used an output transformer, just to play
with. So 'SET' I guess, if T = Transistor. ;-

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

"Jim Lesurf" wrote

That said, I did have one of my summer project students once develop a
single-ended transistor amp that used an output transformer, just to play
with. So 'SET' I guess, if T = Transistor. ;-


As used in car radios at one time. Hybid and early all-transistor car radios
mostly seemed to use a Class-A single-ended power transistor (OC16 or
similar) output stage rather than a Class-B push-pull pair. I guess it was
cheaper and the much higher power consumption of Class-A didn't matter much
in a car.

David.