[Heathkit] Heathkit SB-610 scope

[Larry Knapp]

Jim - I don't have an answer on the compactrons, but on the "2nd, the focus is
good on the leading end of the trace but deteriorates badly at the trailing
edge"...I do.

You need to look at the resistors that are connected to the scope in the HV
line.  Most of these are underrated.  They are 1/2 watt or 1 watt resistors.  A
cursory look will probably tell you some or all are "cooked".  I would replace
the several there with the same resistance value but higher wattage...double it
at least (they will fit fine).  I would also look at the HV and LV capacitors
in the power supply.  Those caps are underrated also....especially the one in
the HV.  While I'm in there, I'd replace them.  You may have to put two in
series to make up the capacitance & voltage.

These are relatively easy to work on.

73, Larry KC8JX

--- Jim Isbell <millenniumfalcon at cableone.net> wrote:

> I just got a SB-610 and I am having some problems, or maybe NOT.  But I 
> cannot find in the manual and explanation or trouble shooting for these 
> problems.
> 
> 1st, both the compactrons check bad, but they seem to be 
> working...maybe.  The PO of this scope has also found that the two 
> compactrons in HIS scope also test bad but that the scope works.  I have 
> a B&K 747 and he has a Sencore, but both give the same BAD reading on 
> two different sets of compactrons.  Can anyone shed ANY light on this???
> 
> 2nd, the focus is good on the leading end of the trace but deteriorates 
> badly at the trailing edge.  Any suggestions??
> 
> W5JAI



		
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