----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Sent: Sunday, April 12, 2015 9:10 AM
Subject: Re: [Amps] AL-1200 Glitch Resistor
Carl,
Any idea when it went into production? I see it in the on-line parts
list as P/N 10-10154 for $19.11 but I don’t see it on the current PDF
schematic.
** No I dont Paul, time flies at my age but Id say at least 5-6 years.
In this particular AL-1200, the only HV fault current limit is though the
filament choke, plate choke, PCB traces, and wiring post HV filter cap
board.
** As its been since the 80's when it came out.
A single 1N5408 does exist between B- and chassis ground.
** Thats an upgrade as it used to be a 1N4007 which was considered
sufficient by its "designer" but the slightest little burp would short it.
Their schematics need a thorough clean-up. I noticed several parts,
off-sheet connect points, and module numbers that don't match-up. Some of
this may be due to evolutionary changes.
** Good luck with that, their latest schematics are harder to read than ever
so it takes longer to find errors which werent changed.
Pretty soon they will equal TenTec for schematic confusion.
Carl
KM1H
Paul, W9AC
-----Original Message-----
From: Carl
Sent: Sunday, April 12, 2015 8:45 AM
To: Paul Christensen ; amps@contesting.com
Subject: Re: [Amps] AL-1200 Glitch Resistor
See the photos of the current big Ameritron series. They use a big carbon
resistor that is in the parts list, sort of pricey however.
Carl
KM1H
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Sent: Sunday, April 12, 2015 8:25 AM
Subject: [Amps] AL-1200 Glitch Resistor
I'm working on an AL-1200 for a friend. While finding the problem in the
PS, I noticed that a glitch resistor is absent in the design that would
otherwise limit HV fault current. I verified this on both the schematic
and by tracing actual amp wiring. I was expecting a resistor (e.g.,
50/50W) in the B- lead, or in the alternative, in the B+ lead with
appropriate isolation. While the 3CX1200 may be statistically immune to
flashover, it seems a good idea to include one to ensure that HV fault
current is limited under all conditions.
Has anyone here added one to their AL-1200?
Paul, W9AC
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5863 / Virus Database: 4328/9519 - Release Date: 04/12/15
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5863 / Virus Database: 4328/9519 - Release Date: 04/12/15
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|