View source for Preamp 4: 55Fe 'scope traces at lower voltage

The pictures below show oscilloscope traces for gas mixture 50/50 Ar/CO2 and 55Fe source, all are shaper output.
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Preamp 4 is described in GlueX-doc-1364, table 2, row 2; the 'old' preamp is the original one, GPC-01.
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1850V, 55Fe source, old preamp (left) and preamp4 (right)
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1850V.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1850V]]
|width="280pt"|[[Image:preamp4_55Fe_1850V.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1850V]]
|}
As above, for longer
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1850V_2.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1850V]]
|width="280pt"|[[Image:preamp4_55Fe_1850V_2.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1850V]]

|}

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1900V, 55Fe source, old preamp (left, 200 mV/div) and preamp4 (right, 100 mv/div)
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1900V.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|width="280pt"|[[Image:preamp4_55Fe_1900V.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1900V]]

|}
As above, for longer
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1900V_2.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1900V]]
|width="280pt"|[[Image:preamp4_55Fe_1900V_2.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1900V]]

|}

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1950V, 55Fe source, old preamp (left, 200 mV/div) and preamp4 (right, 100 mv/div)
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1950V.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|width="280pt"|[[Image:preamp4_55Fe_1950V.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1950V]]

|}
As above, for longer
{| border="1" cellpadding="2"
|width="280pt"|[[Image:old_preamp_55Fe_1950V_2.jpg|thumb|none|270px|old preamp, 55Fe, 50/50 Ar/CO2, 1950V]]
|width="280pt"|[[Image:preamp4_55Fe_1950V_2.jpg|thumb|none|270px|preamp 4, 55Fe, 50/50 Ar/CO2, 1950V]]

|}