[R-390] 3TF7 Failed in service

[Roy Morgan]

At 12:06 PM 5/10/02 -0400, you wrote:
>Folks,
>Is the STANDBY position of the function switch the same as BREAK IN?


No not at all.

The standby position of the Function switch removes B+ from a number of 
tubes, including the RF and IF amplifier stages and operates the antenna 
relay to disconnect the antenna from the radio and ground it.

The Standby function shorts out the audio signal at the first audio 
amplifier.   I don't know if it operates the antenna relay also.  The 
standby relay is operated by having the Standby switch on and connecting 
the two terminals (tags) at the rear of the set. The relay operates on 6.3 
volts AC filament current supplied from the radio at a current of about 40 mA.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
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