[HBR] Caution

[W6ph at aol.com]

Actually, no story other than looking at the schematic.  I sent this 
caution to Jay Helms to
include in his "Recollections" CD but I'm not sure if it made it in.
 
I think you only have to touch 300 VDC one time to give you a life long 
respect for HV.  My
experience was as a 13 year old with an AT-1 in 1955.  I was thrown across 
the room.
 
My rules:
 
1)  If I'm working on it, I check that the power cord is disconnected and 
short the HV to ground.
 
2)  If I'm testing it, I use insulated probes.
 
3)  If I leave the area and the piece is open, I refer to rule 1.  (At my 
current age, I get distracted
     very easily.)
                                                Kurt, W6PH
 
 
In a message dated 6/11/2010 9:01:42 AM Pacific Daylight Time, 
hbr-request at mailman.qth.net writes:

There probably is a story as to how you found this out?
7 3 
Lorne
ve7box  (HBR 13, HBR 12)

----- Original Message ----- 
From: <W6ph at aol.com>
To: <hbr at mailman.qth.net>
Sent: Thursday, June 10, 2010 9:45 AM
Subject: [HBR] Caution when changing coils


>I have never seen this caution printed anywhere.  If you are going to 
> change the
> plug in coils in the HBR, be sure that the B plus is turned to standby.  
> The L2
> coil has 250 VDC on the primary winding going to the first stage RF 
> amplifier.
> It is probably pretty obvious but sometimes obvious things slip by us.
> 
>                                     Kurt, W6PH  (HBR-13C)