[Fwd: [HeathKit] Heathkit SB-620]

[charles w. morehouse]

Kim,
Increased the variac to 90v and it went into meltdown so guess it's time
to talk to Peter.
Wayne;
W4GBW

charles w. morehouse wrote:
>
> Hi Kim,
> You may be right. Did as you suggested and xformer is running cool.
> Good HV and B+. Being a purist, hate to add a little 6.3vac extra.
> May still talk to Peter Dahl. Many thanks and 73.
> Wayne;
> W4GBW
>
>   ------------------------------------------------------------------------
>
> Subject: Re: [HeathKit] Heathkit SB-620
> Date: Sun, 07 Nov 1999 17:05:19 -0500
> From: Kim Herron <kherron at voyager.net>
> To: "charles w. morehouse" <cwmorehouse at worldnet.att.net>
>
> hi Wayne,
>
> >Restoring an SB-101 type station. Trying to nurse the SB-620 Scanalyzer
> >back to life but am afraid the power transformer is kaput. Heathkit
> >#54-182. Help! Does anyone out there have one? Talk soon.
>
>    Before you completely condemn the power transformer, disconnect the
> filament winding to the CRT and see if the old girl doesn't come back to
> life.  If it does, then what you do is buy a separate filament transformer
> for the CRT and abandon the filament winding in the power transformer.
> It's quite common for the transformer to fail this way and it's also quite
> acceptable to do the outboard replacement.  Heath's vendor didn't use a
> heavy enough winding insulation on the filament for the CRT and it breaks
> down causing the HV to short out.
>
> Kim

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