Re: Modern replacements / xref for deflection transistors

For what it's worth, I've ordered these. Now to see if Central will make
them. Central is one of those companies like Lansdale or American
Microsemi that make obsolete parts, usually from the origional masks after
original companies quit making the parts.

On Wed, Nov 28, 2012 at 12:51 AM, Rodger Boots <rlboots2@gmail.com> wrote:

> Got looking around and see Mouser can get the CEN-U07 (Central
> Semiconductor version that replaces the MPS-U05, MPS-U06, MPS-U07 and
> NTE-188) and the CEN-U57 (Central Semiconductor version that replaces the
> MPS-U55, MPS-U56, MPS-U57 and NTE-189). Good news is they're less than $2
> each, bad news is you have to order 500 (because Mouser doesn't stock them
> and they come in boxes of 500 from Central).
>
> I would be willing to make the order, anyone interested? Price would be
> higher ($4-5 each in small quantities, discount for 50-100 piece lots).
> These sell on Ebay for around $10 each, very hard to find there, saw some
> the other day in a Ebay store, but a normal search doesn't work
>
> .
>
>
> On Fri, Nov 23, 2012 at 1:27 AM, Ian Eure <ieure@mac.com> wrote:
>
>> I managed to fry a G05 board pretty well. I swapped this working board
>> into a dead monitor to test, turns Q608 & Q709 had been swapped and R718
>> caught fire. Also as it happens, someone had replaced F700 on this
>> deflection board with a 10A fuse, so while F600 blew and the Y section is
>> likely fine, a bunch of stuff in the X section got fried.
>>
>> It looks to me like R718, R713, Q705, and Q706 at least are dead.
>>
>> Q705 is just a 2N3906, which I can get anywhere, but Q706 looks harder to
>> come by. While I was digging around the internet, I found this incredibly
>> great list of V2000/G05 transistors with some cross references:
>> http://westnet.com/~chris/arcade/g05_transistor_list.pdf Unfortunately,
>> this list is a good 13 years old itself, so the parts it suggests are
>> obsolete as well.
>>
>> I went looking around and MPSU57 is long discontinued, as is SK3200 and
>> the "upgrade" NTE50 part. NTE189 is the modern replacement for NTE50, but
>> seem to be extremely expensive ($30) when they can be found at all. I found
>> some folks saying they had successfully substituted MPSA56 for MPSU57, as
>> well as MPSA05 for the MPSU07 at Q607/Q707.
>>
>> Has anyone successfully substituted those parts? Looking at the
>> datasheets, it seems like the tolerances are somewhat lower, so I was
>> hoping someone could point me in the right direction. I have a few boards I
>> want to work through, so having some of these on hand will be a big help.
>>
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>
>

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Received on Wed Nov 28 08:52:35 2012