MPSU07 and MPSU57 Alternates (WAS Electrohome B/W monitor transistors)

At 06:46 PM 4/7/98 -0600, you wrote:
>At 03:23 PM 4/6/98 -0500, Joe wrote:
>>
>>On Mon, 6 Apr 1998, David D Humphrey wrote:
>>
>>> Anybody know of a good source for the deflection transistors on the B/W
>>> Electrohome Monitors? I'm looking for the MPS-U05 and the MPS-U57's in
>>> this case (not the 3716's et. al.)
>>>
>>
>> Your best bet is to get the NTE replacements. I tried
>>(unsuccessfully) to track down the MPS-U07s. Circuit Specialists lists
>>them in their catalog, but when I ordered some, they told me that they
>>were discontinued and they couldn't get any more.
>>
>> Of course, if anyone knows some other source.....
>>
>>Joe
>
>These are the same transistors that the WG Color deflection board uses. Has
>anyone tried using TIP transistors? I know the pin outs are not identical,
>the MPSs are EBC, and the TIPs are BEC (or CEB). But if you just bent and
>twisted the leads...?
>One can get TIPs very easily and they are easy to find in high enought
>ratings, and they should be fast enough.
>Any thoughts...? I might just "try" it and see what happens...
>
>-Anders.

Most TIP transistors aren't going to work well. fT is typically 1-3 MHz and
the output capacitance (Cob) is huge (200+ pF). Try MJE182 and MJE172 as
replacements for MPSU07 and MPSU57. They cost about 0.50 ea. from Mouser.
The pinout is different, but they'er a lot cheaper than the NTE stuff.
Also, If you can find them... 2SC3298B and 2SA1306B are ideal replacements
for the '07 and '57.

BTW I have be able to find MPSU10s locally. They're an acceptable, lower
current, replacement for the MPSU07. (i.e. in the Ampliphone deflection
board the '07 is used as a 70ma current mirror, which is much less than the
500ma max Ic current). Gateway electronics in San Diego has lots of them
for $.50

-Scott
Scott Swazey QUALCOMM Incorporated Work: (619) 657-2419
mailto:sswazey@qualcomm.com V-209H Pager:(619) 683-5210
Received on Wed Apr 8 12:29:56 1998