Author Topic: First i.c. ??  (Read 8253 times)

Offline Bluechip

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First i.c. ??
« on: August 21, 2009, 04:46:59 PM »
Hi Troops

Having got bored with my new pastime of spider blinding, decided to see if I could find a circuit for ecll800 valves ( tubes  ::) ). Cos I've got two !

Found this ...

http://www.electricstuff.co.uk/loewe.html

Never seen this one before ... 

Whatever next ... apparently devised to avoid Tax .. nothing changes ..

Dave BC



 
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Offline Darren

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Re: First i.c. ??
« Reply #1 on: August 21, 2009, 05:49:16 PM »
Build a radio then, or two even....

I might have some 2HF's in my stash....but not any 3NF's I don't think....
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline Bluechip

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Re: First i.c. ??
« Reply #2 on: August 22, 2009, 04:33:36 AM »
Darren

Given up building valve radios, not keen on dangling off 200v+, just realised there's not much chance of getting an output tranny anyway. So, off to the tip with 'em. Dunno if they're OK anyway. Should have kept my Mullard Tester .. If I had the program card for ecll800's. Doubtful.

Dave
I have a few modest talents. Knowing what I'm doing isn't one of them.

Offline Darren

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Re: First i.c. ??
« Reply #3 on: August 22, 2009, 04:46:25 AM »
I've got hundreds of output trannies.....literally....just shout if you want anything

BTW, my amp currently uses 1.1Kv HT, but I can crank it up to 5K or so

Scaredycat..... :lol:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline Bluechip

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Re: First i.c. ??
« Reply #4 on: August 22, 2009, 06:47:56 AM »
Scaredycat ?

Damn right I am  :lol:

Anything above 18V for cmos, I'm out of it. Once got 900V off a Modulator Amp. Not going there again.

L.M.F. ... big time  :lol:

Dave
I have a few modest talents. Knowing what I'm doing isn't one of them.

Offline chuck foster

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Re: First i.c. ??
« Reply #5 on: August 22, 2009, 09:46:17 PM »
very interesting tube .......... or should i say valve  :scratch:

i used to repair old radios and guitar amps, the radio voltages were no big deal but the guitar amps were scary!!

i worked on a bass amp for a guy and the output tubes were #6550...........i think there were 8 of them and they ran 750 plate volts.
and 750 volts hurts like  :zap: well you know.

just some of my ramblings for night.

chuck :wave:
hitting and missing all the way :)

skype:  aermotor8

former hmem member

Offline John Swift

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Re: First i.c. ??
« Reply #6 on: October 02, 2010, 10:58:29 AM »
Hi Dave

 Radio Spares or RS Components as the call them selves now
stock a 3.5w multitapped output transformer 210-6475 if you decide to build some thing with
the ecll800 valves , some people have experimented with  ht voltages of only 20v to 45v  

the picture of the ecll800 reminded me of an early operational valve amplifier
 
If i remember correctly at one time  grundig sold radios as kit to avoid the taxes

the kit was infact a ready made radio without the valves fitted !

  John
« Last Edit: October 02, 2010, 11:05:13 AM by John Swift »

Offline Bluechip

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Re: First i.c. ??
« Reply #7 on: October 02, 2010, 01:18:44 PM »
Hi John

Long since gone to the tip. I think I took them the next day. As posted, I've no idea if they were OK. Just got a bit nostalgic ...

That Op-Amp looks interesting.

Some stuff I worked on when I first started work had valve Op_Amps, they were ECC81 or 12AT7's rather than ECC82.
Them and the damn great 6080 double triodes .. used to drive differential relays .. I think that's what they were called ..

The ones that are On - Off - On, rather than On - On, as per a normal C/O relay

Days long gone ...

Dave BC

 
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Offline andyf

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Re: First i.c. ??
« Reply #8 on: October 02, 2010, 02:28:46 PM »
Dave, the adverts in your link to the Loewe valve showed they could be sent in for repair as long as the glass was intact. Not a service offered by IC manufacturers today. That said, not many modern ICs cost half a week's wages!

Andy
Sale, Cheshire
I've cut the end off it twice, but it's still too short

Offline Bluechip

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Re: First i.c. ??
« Reply #9 on: October 03, 2010, 04:07:39 AM »
Hi Andy

Right! Pity they don't fix things like they used to do.

I've got a duff BC108 here could benefit from being rebuilt ...  :scratch:

Dave BC
I have a few modest talents. Knowing what I'm doing isn't one of them.

Offline John Swift

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Re: First i.c. ??
« Reply #10 on: October 03, 2010, 07:56:50 AM »
Hi Dave  

the relays rings a bell

I think I,ve seen reference to magneticaly  biased relays that have a memory
that have two coils to set and reset them

as an apprentice in the mid 70's i did see the Mullard NORBIT logic moduals
germanium diode / transistor logic constructed on a small pcb and the potted in colour coded epoxy

looked like an overgrown ic

I think am showing my age   !!!


if one junction of the bc108 is ok turn it into a photo diode
before Mullard go wise you could remove the black paint of OC71's  intsead of buying the expensive OCP71's


     John


   have now found a picture
« Last Edit: October 03, 2010, 08:15:22 AM by John Swift »

Offline Bluechip

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Re: First i.c. ??
« Reply #11 on: October 03, 2010, 04:31:34 PM »
John

Bit difficult to turn a BC108 into a photo anything. In a metal can, at least mine are .. loads of the things anyway, only about 10p each  :)

Apprentice in the middle '70's??

Just a sprog    :lol: ... I started Jan 9 1960 IIRC ..

07:30 start, allowed 3 mins, otherwise 1/2 hr docked. First rate was 9 1/2d  ( no not pence, the old pennies, ie 1/240th of a £ ) hr.

44 1/2 hr week. Sat AM 08:00 to 12:30 was part of the working week.

You young whippersnappers had it EASY ..  :lol:  :lol:

Dave BC


I have a few modest talents. Knowing what I'm doing isn't one of them.

Offline John Swift

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Re: First i.c. ??
« Reply #12 on: October 04, 2010, 06:16:12 AM »
Hi Dave

               My first wage was £9 10s and I was well off !

I don't think the work prevention job's worths would let you do half the things I did

working on live equipment in a dusty mixing room by week 3 with the sparks

or  working with hot wired glass passing near  your head , while kneeling on broken glass

apprentices got all the good jobs didn't they


all you have to do with the BC108 is cut the top off

if you like you can use the NASA can opener !

for more search for  " tin whiskers in AF116/7 "

   
  John                       



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Re: First i.c. ??
« Reply #13 on: October 04, 2010, 06:36:53 AM »
Re valves and getting bitten... I was once a g7 ham but used to help a relative out now and again with cb stuff, and he used to use a zetagi bv300 and later a different one I cant remember the name. Only thing was it used to carbon up the changeover relay and the rig would go deaf with time. So I showed him how to clean the contacts and made up a probe with a resistance to bleed it down properly etc. Anyway, he's mid session with some rare station he'd been after for years and it started to go, so he takes off the cover and hits the problem relay with a squirt of contact cleaner while keying up his base mic to open it. His grounded alloy base mic.....
The valve field collapsed up the contact cleaner spray and into him, it took the heart path across his body and down the other arm and the reaction lifted him bodily across the room into a wall behind and melted his glasses frames into a twisted mess. He went the hospital after and was really ill for a few days.

I never knew contact cleaner was conductive, but Id never been dumb enough to find out the hard way.
Its probably the last time I showed someone how to do something to something really dangerous that I didnt trust 1000% to listen...

Offline madjackghengis

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Re: First i.c. ??
« Reply #14 on: October 29, 2010, 09:31:00 AM »
I went through a ham radio phase in the late sixties, as a boy, built a few kit recievers and a transmitter, then moved on to bigger and better things, engines and motor bikes, then went through electronics training for the Marine Corps, in the mid seventies, had tube theory, but was told by instructors not to worry about it, we'd never see a tube out "in the fleet".  I retired out of the Corps in '97, my last tour as Non-Commissioned Officer in Charge of the same exact electronics shop I had for my first duty station, right here in North Carolina, and when I left, we still had half the six hundred odd systems we maintained for communications and navigations were tube driven, with solid state pre-amps and the like.  At the same time, my new techs, checking in to the shop, mostly had never seen a tube and were shocked.  Our radar units were up in the three to six thousand volt range for their finals, that didn't so much hurt as laid you out and got you a visit to the hospital, and two or three days bedrest.  I hit 1500 volts of dc/rf out of a transponder, and had a small hole blown in my finger, right down to the bone, took about a year to heal, and almost six months to even start healing.
    Working with solid state is very nice and much less painful now, I don't need to go back to tubes or valves as you chaps like to call them, over the pond, although they were easier to troubleshoot, and almost impossible to blow up, unlike the touchy little transistors.  Tube amplifiers still produce the warmest sound and are much prefered by the "real audiophile", or so I've been told.

Offline cidrontmg

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Re: First i.c. ??
« Reply #15 on: October 29, 2010, 11:32:13 AM »
  Tube amplifiers still produce the warmest sound and are much prefered by the "real audiophile", or so I've been told.
Heh, indeed, and they also produce the best distortion/overdrive, for an electrical guitar amp, also preferred by many guitarists to transistor fuzz boxes... You´d be amazed at how difficult it is to distort the sound in a specific, "good" way...   :loco:
 :wave:
Olli
Penafiel
Portugal