Re: WANTED: Good Source of Electronics Theory

Don Pearce wrote:

> On Sat, 19 Apr 2008 14:36:36 -0700 (PDT), EADGBE
> <hwbosshoss@[EMAIL PROTECTED]
> wrote:
>
> >On Apr 19, 5:04 pm, "DaveM" <masondg4...@[EMAIL PROTECTED]
> wrote:
> >>
> >> In your tape circuit, the big clue to the problem is lack of any
voltage at the
> >> collector of Q205.  Q205 must be turned on, at least partially, in
order for any
> >> voltage to appear at its collector (which is showing no voltage).  It
is the
> >> only path that can supply the current to Q203 is through the E-C
circuit of
> >> Q205.  If Q205's B-E is properly forward biased, current should flow
through the
> >> C-E circuit.
> >
> >Could you repeat this part, please?
> >
> >There is no Q203 in this circuit.
> >
> >Thanks for your help!
>
> Q205 is biased just fine. It has nearly 5V emitter to collector,

NO. Those are the service manual values. Q205's collector is actually
almost at ground
potential, i.e. not conducting.

Graham