Check the bleeder resistors too.
They are prone to opening up with a very small clearance and arcing can
develop across the gap.
Alex 4Z5KS
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Carl
Sent: Friday, November 23, 2012 4:43 PM
To: HeathKit_HFAmps@yahoogroups.com; amps @ COL
Subject: Re: [Amps] [HeathKit_HFAmps] Heathkit SB-1000 Arcing
If the arcing started after the caps were changed Id start in that area.
Could be a loose cap hold down screw, ground wire, etc.
Carl
KM1H
----- Original Message -----
From: Thomas F Giella NZ4O
To: amps @ COL ; a SB-1000 @ Yahoo
Sent: Friday, November 23, 2012 8:24 AM
Subject: [HeathKit_HFAmps] Heathkit SB-1000 Arcing
I have an old Heathkit SB-1000 made in 1989. It has a new 3-500Z tube and
new power supply capacitors.
The amplifier has developed and internal arc somewhere but I can't locate
visually locate it. When the arc occurs the voltage drops from
approximately
3100 to 2900 volts.
So I presume it's occurring somewhere in the power supply. When the arcing
isn't occurring power output is within the normal range.
My tech skills are not what they once were so any helpful comments would
be
much appreciated.
73 & GUD DX,
Thomas F. Giella NZ4O
Lakeland, FL, USA
nz4o@tampabay.rr.com
NZ4O Amateur Radio & SWL Autobiography: http://www.nz4o.com
NZ4O MF/HF/6M Radiowave Propagation Forecast: http://www.solarcycle24.org
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