[ARC5] [ARC-5radio] Troubleshooting a BC 455

[AKLDGUY .]

> The good news is no more smoke and AM reception is just fine.
However, there is no CW reception,
> as if the oscillator is not functioning. No carrrier wave audible while
listening to an AM station in the cw mode.

The oscillator may be functioning, but it may be off-frequency.
You could use a nearby receiver to tune around the IF frequency and listen
for it.

73 de Neil ZL1ANM


On Sat, Jul 12, 2014 at 7:01 AM, skeller53 at gmail.com [ARC-5radio] <
ARC-5radio at yahoogroups.com> wrote:

>
>
> Gentlemen,
>
>
>
> I found (XYL not so happy) the time to recap and restuff my 455B
> capacitors. More work than iimagined.
>
>
>
> I turned the radio on and only partial joy in Mudville.
>
>
>
> The good news is no more smoke and AM reception is just fine.
> However, there is no CW reception, as if the oscillator is not functioning.
> No carrrier wave audible while listening to an AM station in the cw mode.
>
>
>
> I measured the tube to chasis resistance as suggested in Table 11 of the
> manual. The only values out of the normal range are on pins 3&5 of tubes V3
> and V5 (the cathode to grid connections). Normal 300,000 ohms. I measure
> 427,000 ohms.  The measured voltages are within what I would consider the
> normal range for my power supply. Pin 4 of J3 reads 140,000 ohms, so it is
> not shorted to ground turning off the oscillator.
>
>
>
> I imagine the problem is in the CW oscillator circuit or the second i.f.
> transformer.
>
>
>
> Any suggestions befor I begin replacing the capacitors in the oscillator
> circuit?
>
>
>
> In the way of test equipment, I have a frequency counter and a VOM. I may
> be able to get hold of a scope.
>
>
>
> I have attached a Table with the resistance measurements.
>
>
>
>
>
> Thanks again.
>
>
>
> Steve
>
> K2DKT
>
>
>
>
>
>  __._,_.___
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