SB-650 Results

[Robert Myers]

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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