Re: Modern replacements / xref for deflection transistors

I've seen them on some boards....

Op 28 nov. 2012 om 17:52 heeft Mark Capps <catfishh@bellsouth.net> het volgende geschreven:

> Hi,
>
> Central use to stock them 4-5 years ago.
>
> Mark
>
> On 11/28/2012 08:52, Rodger Boots wrote:
>>
>> 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 12:48:27 2012