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Re: [Amps] SB-220 Re-Build

To: Jim <jimw7ry@gmail.com>, amps@contesting.com
Subject: Re: [Amps] SB-220 Re-Build
From: Joe <nss@mwt.net>
Date: Mon, 13 May 2019 19:41:02 -0500
List-post: <mailto:amps@contesting.com>
aLL SHE COULD MAKE HE HE HE i KNOW i KNOW. bUT WITH THAT ACTIVE BIAS THE TUBES BARELY CHANGED COLOR AT MOSE A DULL RED. SO THOUGHT i WAS SAFE.

oopS cAPLOCK

Anyway I did not know the weak link was the transformer.

Joe WB9SBD
Sig

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 5/13/2019 6:45 AM, Jim wrote:
What is a useful bias?

You have lowered the Q of the tank circuit by raising the plate voltage 500 volts which makes it more efficient, but lowers the harmonic suppression.

What power output level were you running in RTTY when you blew up the original transformer?


Thanks
73
Jim W7RY

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