SB-303 Audio Amp board

[al winfrey]

Tim,

My SB-303 manual and schematic clearly shows a matched pair of transistors in the final
audio amp.  Q511 and Q512 are Motorola MJE-371 and MJE-512 respectively.  You should also
check the 100 uf electrolytic for possible failure as well. The driver transistor Q509 is
an RCA 2N3053.

73's and good luck,

al winfrey - wa9hsl
....

Tim WB4BAH wrote:

> Trying to get my old rigs up and running after several inactive years.
>
> Have a SB-303 in which the audio amplifier transistor fried.  The manual
> gives no real information on the diode except the Heathkit part number
> which means nothing in any substitution books I have found. I need
> suggestions on an easy to find transistor to replace it with.  Anything
> from "Ripoff Shack"?  A diode and some resistors also fried, but they
> will be easy enough to figure out.
> --
>
> Tim Kemp WB4BAH      | Homepage http://www.mindspring.com/~tkemp/
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