SB-650 Results

[john]

If I recall, that unit runs VERY hot, which would explain the short lifetime
of the drivers....

John K5MO



At 07:33 PM 6/27/2005, Robert Myers wrote:
>Those driver chips are always going, it seems.
>
>Same type of thing happened to me.  One driver chip went, and then the next
>one, within weeks --- after the thing had been working for 15 years or so.
>Weird...
>
>Cheers,
>--- Rob
>VE3 JQL
>
>
> > -----Original Message-----
> > From: Heathkit Owners and Collectors List
> > [mailto:HEATH at LISTSERV.TEMPE.GOV] On Behalf Of Charles Seitz
> > Sent: Monday, June 27, 2005 8:30 AM
> > To: HEATH at LISTSERV.TEMPE.GOV
> > Subject: Re: [HEATH-TEMPE] SB-650 Results
> >
> > I got my driver chips from Mouser.  Look  for NTE 7441.
> > For now, you might try one of the bad chips in the left most digit.  It
> > doesn't need to decode all of the numbers.
> >
> > My big problem is locating a replacement for the large neon bulb.
> > I'm using a less than adequate NE-2 for now.
> >
> > My pet peeves for the SB-650 are:
> >
> >   a) The power switch that isn't flush with the panel
> >   b) The cheap plastic bezel with the mold marks and the simulated
> >       chrome trim that gets gooy and disolves off.
> >
> > Those were probably engineered by 'management'.
> >
> > ----- Original Message -----
> > From: "TChesek at Epix.Net" <tchesek at EPIX.NET>
> > To: <HEATH at LISTSERV.TEMPE.GOV>
> > Sent: Saturday, June 25, 2005 15 06
> > Subject: [HEATH-TEMPE] SB-650 Results
> >
> >
> > Thanks to all that offered information. I found 3 bad driver chips. I
> > "borrowed" three from my bench frequency counter which uses the same
> > nixies
> > and drivers. I had issues locking onto the correct display values above 40
> > meters. I decided to go back to the basics. It had been a few years since
> > giving my HW-100 a going over, so I cleaned all switch contacts, tested
> > all
> > tubes ( found only 1 weak) and cleaned tube pins/sockets. My SB-650 is now
> > working like a champ. All I need now is a source for the three 7441 driver
> > chips..
> >
> > 73,
> > Tom K3TVC
> >
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