sb610 scope

[Paul Stump]

Bob,

In addition to Stu's excellent advice, I once had either R605 or R600
visably charred.  Replacing it cured the focus problem.

Good luck!

73,
Paul Stump
NØLRF

--- W6CUX <w6cux at EARTHLINK.NET> wrote:

> I would check the high value resistors around the FOCUS and
> INTENSITY controls. They have probably drifted off such that
> you can't get the right focussing voltage. Don't try to
> measure that voltage with your DVM. It will load it down the
> circuit too much and the voltage there will probably blow
> the input of your DVM (lessons learned).
>
> 73, Stu W6CUX
>
> BTW -- there is a perfectly useably SB-610 schematic on
> BAMA.
>
> ----- Original Message -----
> From: "bob" <rfpark at AOL.COM>
> To: <HEATH at LISTSERV.TEMPE.GOV>
> Sent: Thursday, November 04, 2004 12:19 PM
> Subject: sb610 scope
>
>
> have a sb610 scope and just put in a new ( used) crt and
> can't get the
> trace smaller than 3/16s of an inch high so can't get a nice
> sharp display
> any suggesstions on a fix?
>
> bob
> rfpark at aol.com
>
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