SB-610 Oscillator Problem

[Mark Graalman WB8JKR]

Very rarely do the PEC's go bad, they're nothing
more than a simple R-C network. I would
replace both cathode resistors with  3.3K ohm
and replace the bypass caps then I'll bet she'll
take off.

Mark  WB8JKR


On Thu, 30 Dec 2004 22:09:22 -0600 "Randall C. Iliff"
<riliff at COMMSPEED.NET> writes:
> Hi All,
>
> I'm working on an SB-610 and for some reason neither oscillator
> will
> function.  Parts are the right ones, soldering is ok, switch
> cleaned, tube
> checked.  The cathode resistors have grown from 6,800 (heath value)
> to a
> current value of 10,150 and 7,800 ohms respectively.  I can
> certainly swap
> those out, and the 10 mfd caps that bypass them, with parts on hand
> but have
> not yet done so.
>
> Anybody else ever encounter a similar problem with these seemingly
> simple
> oscillator circuits?
>
> My concern is that the PEC phase shift networks seem to be open
> between pin
> 1 and 2.  (It seems odd to me that they'd both read that way, so
> maybe I'm
> not measuring them properly.)
>
> Anybody have the component values inside that overgrown ceramic
> package?  At
> least then I could check these units or build up individual
> component
> substitutions if they are bad.
>
> Thanks, and best wishes for a wonderful new year!
>
> All the best,
>
> Randy (KE0BN)
>
>
>
>
>
>
>
>
> On 12/29/04 1:44 PM, "w0akg1" <w0akg1 at EARTHLINK.NET> wrote:
>
> > Some one has these made, I need one, thanks Guys.
> > Martin Tippin WØAKG
> > 31 Circle Dr.
> > Windsor, Mo 65360
> >
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