Hello; I have a rebuilt DENTRON MLA-2500 amp, 160 to 10 meters. With the
Swetlana single 4CX-800
tube, It works fine. I would like to sell it. Can anyone give me a estimate
of its value on the market? It has not been used since I did the mods.
Regards
Bryan VE6NA
-----Original Message-----
From: owner-amps-digest@contesting.com
[mailto:owner-amps-digest@contesting.com]
Sent: March 1, 2001 9:46 PM
To: amps-digest@contesting.com
Subject: RF Amplifier Discussion Digest V4 #70
RF Amplifier Discussion Digest Thursday, March 1 2001 Volume 04 : Number 070
In this issue:
Re: [AMPS] henry 2k-4 hv breaker
Re: [AMPS] henry 2k-4 hv breaker
See the end of the digest for information about amps-digest
----------------------------------------------------------------------
To: <amps@contesting.com>
Date: Thu, 1 Mar 2001 16:18:49 -0600
From: "MIKE KREKO" <mkreko@i-55.com>
Subject: Re: [AMPS] henry 2k-4 hv breaker
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nominal drive is 120 watts
i am using a kenwwod 440 sat @ 100 watts=20
mkreko@i-55.com
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<DIV>
<DIV><FONT face=3DArial size=3D2>nominal drive is 120 watts</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>i am using a kenwwod 440 sat @ 100 =
watts=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> <A=20
href=3D"mailto:mkreko@i-55.com";>mkreko@i-55.com</A><BR></FONT></DIV></DIV=
></BODY></HTML>
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To: <amps@contesting.com>
Date: Thu, 1 Mar 2001 16:39:08 -0600
From: "MIKE KREKO" <mkreko@i-55.com>
Subject: Re: [AMPS] henry 2k-4 hv breaker
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that explains it I was loading the amp correctly at a lower drive level =
so as not exceed the limits=20
the higher drive exceeded the limits and tripped the breaker protecting =
the amp and tubes as it should
running the amp I had no problems because I didn't exceed the limits
it seems all is well=20
DX is!
thanks to all for all the help
- ----- Original Message -----=20
From: Phil Clements=20
To: MIKE KREKO=20
Sent: Thursday, March 01, 2001 4:21 PM
Subject: Re: [AMPS] henry 2k-4 hv breaker
Subject: Re: [AMPS] henry 2k-4 hv breaker
what i am trying to say i cannot load the amp with 100 watts drive =
with out exceeding the 800 ma plate current not grid (grid is ok)=20
i dont think it should reach that that is why i suspect a bad tube
Forget the 100 watts drive...what you are looking at when tuning up
is grid current (230 ma max) and plate current (800 ma max)
Do not advance the drive from the exciter so as to exceed either one
of these limits. Tune and load for maximum power output from the amp
then check the grid and plate current. If either one is above the =
limit,
back off on the drive from the exciter. On SSB the meters should =
peak
to no more than 400 ma plate current, and 115 ma grid current when =
you
speak into the mike. If they do,back off on the mike gain until they =
don't.
Have fun!
Phil, K5PC
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<DIV>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial size=3D2>that explains it I was loading =
the amp=20
correctly at a lower drive level so as not exceed the limits =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>the higher drive exceeded the limits =
and tripped=20
the breaker protecting the amp and tubes as it should</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>running the amp I had no problems =
because I didn't=20
exceed the limits</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>it seems all is well </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>DX is!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>thanks to all for all the =
help</FONT></DIV>
<DIV> </DIV></FONT>----- Original Message ----- </DIV></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dphilk5pc@tyler.net href=3D"mailto:philk5pc@tyler.net";>Phil =
Clements</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dmkreko@i-55.com=20
href=3D"mailto:mkreko@i-55.com";>MIKE KREKO</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, March 01, 2001 =
4:21=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [AMPS] henry 2k-4 =
hv=20
breaker</DIV>
<DIV><BR></DIV>
<DIV><B>Subject:</B> Re: [AMPS] henry 2k-4 hv breaker</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>what i am trying to say i cannot =
load the=20
amp with 100 watts drive with out exceeding the 800 ma plate=20
current not grid (grid is ok) </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>i dont think it should reach that =
that is why i=20
suspect a bad tube</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" =
color=3D#0000ff></FONT> </DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>Forget the 100 =
watts=20
drive...what you are looking at when tuning up</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>is grid current =
(230 ma max)=20
and plate current (800 ma max)</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>Do not advance the =
drive from=20
the exciter so as to exceed either one</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>of these limits. =
Tune and load=20
for maximum power output from the amp</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>then check the =
grid and plate=20
current. If either one is above the limit,</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>back off on the =
drive from the=20
exciter. On SSB the meters should peak</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>to no more than =
400 ma plate=20
current, and 115 ma grid current when you</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>speak into the =
mike. If they=20
do,back off on the mike gain until they don't.</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>Have =
fun!</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS" color=3D#0000ff>Phil, =
K5PC</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3D"Comic Sans MS" =
color=3D#0000ff></FONT> </DIV>
<DIV><FONT face=3D"Comic Sans MS"=20
color=3D#0000ff></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTM=
L>
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End of RF Amplifier Discussion Digest V4 #70
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