HP-13 transistors

[Garey Barrell]

At 10:10 PM 7/16/98 -0400, Multi-Volti Devices wrote:
>Hello:
>
>Here's the 'alleged data'. I got it from a computer printout that was
>dumpstered. I don't trust everything I read in the Heath parts lists from
>their computer because they were probably sometimes keyed in by staff
>without technical knowledge, and thus errors could get thru. I have found
>errors like mA and A interchanged, and ac and dc voltages not stated due
>to lack of room.
>
>417-60 SP838 Ge PNP 45 V 25 A 100 W b = 60-300
>
>There was no 2N number, apparently, with SP838 being the original number.
>
>Someone ought to try FET's. I'm guessing the circuit was a so-called
>Royer inverter, which incidentally, was revived for laptop PC backlight
>inverters! They just use ferrite at much higher freqs instead of iron.
>
>Murray
>
>Michael Tallent wrote:
>
>> Hello:
>>
>> Anyone know what the 2N number for the power transistors in the HP-13
>> power supply is.  Heath part number 417-60.
>>
>> Thanks
>>
>> Mike W6MXV  in KY
>>

Murray -

The "SP838" number also references the ECG 179, so probably all right.
Your suggestion of FET's is a good one, but might require juggling some
resistor values.

73,

Garey - K4OAH
k4oah at mindspring.com
Atlanta

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