Re: TIS98 and TPS98 transistor questions

About the only thing that bunch have in common is being NPN! Here's how
they cross:

TIS98 NTE107
2SC2240 NTE90
TPS98 NTE194
2N4401 NTE85
2N3904 NTE85

Though, that being said, this in not a critical application. As long as
the part can take the voltage and current there shouldn't be a problem.

Phil Morris wrote:
>
> Afraid it's head-scratching time again.
>
> A few days ago I replaced all the TIS98 transistors on my G05-801's
> deflection board with what I thought was the nearest equivalent, 2SC2240
> (only one transistor was faulty but I replaced them all to ensure a perfect
> 'match' with each other).
>
> This cropped up in a conversation with someone else and he said he didn't
> think 2CS2240 was a suitable/close enough replacement for TIS98.
>
> I've looked at the data sheets for these and yes, they *are* different,
> however my relatively small amount of electronics knowledge precludes me
> from determining the 'important' differences.
>
> Now, the monitor works okay, but I am now left wondering whether these
> (possibly wrong) replacements may cause other problems, either now or in
> the future.
>
> I am also wondering whether they may be the cause of my slightly jagged
> diagonal lines, 'hidden' stationary vertical lines that moving objects
> 'ripple' over, etc.
>
> Andy Welburn kindly pointed out a few days ago that 2N4401 was a good
> replacement for TPS98, but is 2N4401 *also* a good replacement for TIS98 on
> my G05-801 deflection board?
>
> Why was TPS98 used instead of TIS98 on, presumably, later boards? Maybe it
> was only in later revisions of the G05?
>
> Please note: I'm in the UK so can't so easily get hold of the NTE
> replacements, so I'm looking for parts I can easily obtain in the UK. I
> have some 2N4401's already, plus I have read that 2N3904 is a good
> substitute for TIS98 (is it?) - I can obtain the latter from Farnell in the
> UK if necessary.
>
> Thanks,
> Phil
>
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Received on Sun Jan 20 13:38:40 2002