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@ezwv.com]
Sent: Thursday, February 03, 2005 4:14 PM
To: Amps@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@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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