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

[Steve Katz]

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
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