[BULK] - Re: [Amps] sb-221 blowing house fuses

[Mark - AA6DX]

My bet is that the steatite (?) insulator bolted in the high voltage cage to 
hold off the HV safety shorting bar has come "unscrewed" in shipment, and 
the shorting bar is "doing its thing" .. .. ..
BTW .. my opine, it is perfectly OK to ship that series of amps with the 
3-5ØØ tubes in their sockets -- by taking off the top of the HV cage, and 
"stuffing" the cage with packing material.  I use wadded up butcher paper 
myself, it is more resilient than newspaper, etc --- and does not leave ink 
smudges on the equipment.  I have shipped several SB-22Øs (and other radios 
with hollow state devices) that way, never a problem with the tubes.
73  Mark    AA6DX    Eureka, Far Northern California


----- Original Message ----- 
From: "Steve Katz" <stevek at jmr.com>
To: "'Will Matney'" <craxd1 at ezwv.com>; <Amps at contesting.com>
Sent: Thursday, February 03, 2005 4:30 PM
Subject: RE: [BULK] - Re: [Amps] sb-221 blowing house fuses


> Was the SB-220 shipped with the tubes installed in their sockets? 
> (Usually
> a really bad idea...)
>
> If so, did you open up the amp to see if the tubes are still intact, still
> seated in their sockets, without parts dangling?  My first thought is a
> plate cooler cap floating around inside, still connected to the B+ via the
> parasitic suppressor...
>
> -WB2WIK/6
>
> -----Original Message-----
> From: Will Matney [mailto:craxd1 at ezwv.com]
> Sent: Thursday, February 03, 2005 4:14 PM
> To: Amps at contesting.com
> Subject: [BULK] - Re: [Amps] sb-221 blowing house fuses
>
>
> Well, there's a short somewhere. I'd say it's most likely in the HV power
> supply. Could be a rectifier or capacitor, or both. Could also be a
> shorted tube if it's got the old Eimac 3-500Z in it. I think the anode
> welds would break and it would fall into the grid and short out if I
> remember.
>
> Will
>
>
> On Thu, 3 Feb 2005 23:59:05 -0000, KO1H <KO1H at cox.net> wrote:
>
>> Hi all. I just received my SB-221. Its looks as advertized, but I
>> connected it to AC and threw the swtich and well lets say instant
>> darkness.  Where do I start looking?  Regretfully I dont have the
>> manual.  Hopeing to aquire one soon.  de John ko1h