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i got ahold of a pulse width osc. from 1 to 17,000 cycles

i got ahold of a pulse width osc. from 1 to 17,000 cycles

2007-04-26 by kidkrazy58

it was ok but i got it for the tubes mainly and paid like 40 for it. 
it had these 7119 tubes in them actuelly 5 of them and 11 other tubes 
one telefunken 12au7. The 7119s say made in holland but arnet marked 
amprex but are marked Beckman. they have a d getter like the old 
amprex are supposed to but i dont know.imtrying to find the value of 
these. i cant tell if the tops are pinched what does a pinched tip 
look like on a tube cause in the example i couldnt see a diffrence. ok 
thanks

Re: i got ahold of a pulse width osc. from 1 to 17,000 cycles

2007-04-28 by bbluthang

i usually start my searching for tube info here -
http://tdsl.duncanamps.com/tubesearch.php
doesn't have everything but 9 times out of 10 it turns up something.

re pinched tubes (from wiki) - "Miniature tubes (e.g., the 12AX7) were
introduced around World War II. Wires protruding through the bottom of
the glass envelope plugged directly into the socket -- there was no
separate base. The pinched-off air evacuation nub was at the top of
the tube, giving it its distinctive appearance"

sounds like you have a good junk shop near you, i'd love to spend an
hour or two in there.
andrew



--- In tubesynthdiy@yahoogroups.com, "kidkrazy58" <andrewxx58@...> wrote:
Show quoted textHide quoted text
>
> it was ok but i got it for the tubes mainly and paid like 40 for it. 
> it had these 7119 tubes in them actuelly 5 of them and 11 other tubes 
> one telefunken 12au7. The 7119s say made in holland but arnet marked 
> amprex but are marked Beckman. they have a d getter like the old 
> amprex are supposed to but i dont know.imtrying to find the value of 
> these. i cant tell if the tops are pinched what does a pinched tip 
> look like on a tube cause in the example i couldnt see a diffrence. ok 
> thanks
>

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