[Amps] SB221 Low Output

Alex Barbon dv1tbx at gmail.com
Sun Sep 11 18:57:00 PDT 2011


Hi to all,

Iam working with an SB221 amp, cantget the power output to go higher than
400watts either AM or SSB voice peak. The tube is confirm good from a
working amp.

Here is my reading

*20m, AM mode ( no modulation )

*Plate current = 680mA
Grid current = 180mA
HV= 2750V SSB
Drive = 90~100watts
Output = 450watts

*40m, AM mode ( No Modulation )
*
Plate current = 580mA
Grid current = 160mA
HV= 2750V SSB
Drive = 90 ~ 100watts
Output = 400watts

Hope to find some info what and where to troubleshootc for this problem.

Thank you,
Alex


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