thermistors

[Magnus Danielson]

>>>>> "EaSED" == Eric at Svetlana Electron Devices <svetengr at earthlink.net> writes:

 >> However, I have found a company that does similar tempcos and
 >> precission resistors. I have been thinking of doing a more systematic
 >> search and sum it up on a webpage or a few. Would this be helpfull for
 >> anyone?

 EaSED> Given the few options, and the increasing scarcity of CEM3340s and
 EaSED> other temp-stabilized VCO devices, maybe you should.

I have now scribbled some stuff together, so it's getting there.

 >> Eric, do you experience the same trouble with your glas fet's? ;)

 EaSED> No, in fact, the supplies of tubes have IMPROVED in the last few
 EaSED> years. GLASS AUDIO magazine publishes a WORLD TUBE DIRECTORY
 EaSED> book every year, full of contacts and other info. And why don't
 EaSED> analog-synth parts mfrs do the same??

Well, I think that the difference here is that tubes are a very
specific component where as the set of components that are used in
analog synts have a spread spectrum of functions, except for things
like CEM and SSM chips which are much more dedicated.

I think we (the users in a sense) better shape up our act. Shall we?

Meanwhile, a few tempco and precission manufactors have got onto the page:
http://www.it.kth.se/~e93_mda/electronics/

BTW. Except for Sovtec I know of no other tube source on the net, can
you enlighten me?

 EaSED> And one other thing: it's funny that 3340s and other such devices
 EaSED> are no longer manufactured. Making a temp-stabilized VCO of any kind
 EaSED> with semiconductors is now much more difficult than it used to be.

I agree (in a sense). Good and unique products are beeing terminated
without replacement components with even similar in function. With
todays precission analog IC technology with good fab processes and all
that it should not be all that difficult to make such a
chip.... Hmm... I am in the wrong buissness here? (I work as a network
protocol designer and system architect at office hours.)

 EaSED> Yet I can still get thyratrons to make VCOs.....and thyratrons are still
 EaSED> being made, albeit in Russia.....

Well, I saw the preformance in temperature stability, and I was
impressed. Why is it that the range is only 2.5 octaves?
I am really bad on tube theory and eager to learn more.

Cheers,
Magnus