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That is exactly my experience wirth QB5/1750 or the russian aquivalent.
12-13db of gain are quite normal with 4,5 to 5 KV on the Plates in
GG zero bias configuration.
With higher voltages you need a very good bandswitch to prevent arcing.
73, Peter
>
> My 4-1000A amp will get 1800W key down output with 4400V full load
> on the plate and 100W drive. At 5000V things start to arc all over
> the place. It is very happy with 70W drive for 1500W output and 4400V
> full load plate voltage. Tube is "new old stock", not a BC pull.
>
> Mike, W1NR
>
>
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<HTML><FONT FACE=arial,helvetica><FONT SIZE=2>That is exactly my experience
wirth QB5/1750 or the russian aquivalent.
<BR>12-13db of gain are quite normal with 4,5 to 5 KV on the Plates in
<BR>GG zero bias configuration.
<BR>With higher voltages you need a very good bandswitch to prevent arcing.
<BR></FONT><FONT COLOR="#000000" SIZE=3 FAMILY="SANSSERIF" FACE="Arial"
LANG="2">
<BR>73, Peter
<BR></FONT><FONT COLOR="#000000" SIZE=2 FAMILY="SANSSERIF" FACE="Arial"
LANG="2">
<BR>
<BR></FONT><FONT COLOR="#000000" SIZE=3 FAMILY="SANSSERIF" FACE="Arial"
LANG="2">
<BR></FONT><FONT COLOR="#000000" SIZE=2 FAMILY="SANSSERIF" FACE="Arial"
LANG="2"><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid;
MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<BR>My 4-1000A amp will get 1800W key down output with 4400V full load
<BR>on the plate and 100W drive. At 5000V things start to arc all over
<BR>the place. It is very happy with 70W drive for 1500W output and 4400V
<BR>full load plate voltage. Tube is "new old stock", not a BC pull.
<BR>
<BR>Mike, W1NR
<BR>
<BR></BLOCKQUOTE>
<BR>
<BR></FONT></HTML>
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