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What's the question, how feeding power (where and how apply drive) or =
how biasing ?
I bet my friend Fabio aready biased the tube. (avoiding the DAF method, =
hopefully)
Isn't it Fabio ?
73,
Mauri I4JMY
-----Messaggio Originale-----=20
Da: Lars Harlin=20
A: Fabio Grisafi (IT9GSF) ; amps@contesting.com=20
Data invio: marted=EC 19 ottobre 1999 3.10
Oggetto: SV: [AMPS] QBL 5-3500 - How to feed it ?
There are a couple of ways. Conventional AB1 with regulated =
screensupply and passive input (control grid shunted to ground with 50 =
ohms) or as I use the tube; in G2DAF configuration, with floating point =
of operation. (Hope this wont start a new dabate, as we have been thru =
it a couple of times before....) Either way, it makes a very sturdy amp =
with abt 15 - 20dB gain and from my experience the
only thing that can take the life out of that tube (in Ham-use), is if =
you use a hammer....!
73 GL de Lars/SM3BDZ
----- Ursprungligt meddelande -----=20
Fr=E5n: Fabio Grisafi (IT9GSF)=20
Till: amps@contesting.com=20
Skickat: den 18 oktober 1999 23:32
=C4mne: [AMPS] QBL 5-3500 - How to feed it ?
Ho wto feed the power thetrode QBL5-3500 by Philips ? Anyone uses =
that external anode
old TV Band I and FM tube ? I wish to use it on HF...
73 !
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<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>What's the question, how feeding power (where and =
how apply=20
drive) or how biasing ?</FONT></DIV>
<DIV><FONT size=3D2>I bet my friend Fabio aready biased the tube. =
(avoiding the=20
DAF method, hopefully)</FONT></DIV>
<DIV><FONT size=3D2>Isn't it Fabio ?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>73,</FONT></DIV>
<DIV><FONT size=3D2>Mauri I4JMY</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">-----Messaggio Originale----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>Da:</B> <A=20
href=3D"mailto:harlins@swipnet.se"; title=3Dharlins@swipnet.se>Lars =
Harlin</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>A:</B> <A =
href=3D"mailto:fgrisafi@tin.it"=20
title=3Dfgrisafi@tin.it>Fabio Grisafi (IT9GSF)</A> ; <A=20
href=3D"mailto:amps@contesting.com"=20
title=3Damps@contesting.com>amps@contesting.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Data invio:</B> marted=EC 19 =
ottobre 1999=20
3.10</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Oggetto:</B> SV: [AMPS] QBL 5-3500 =
- How to=20
feed it ?</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>There are a couple of ways. Conventional AB1 with =
regulated=20
screensupply and passive input (control grid shunted to ground with 50 =
ohms)=20
or as I use the tube; in G2DAF configuration, with floating point of=20
operation. (Hope this wont start a new dabate, as we have been thru it =
a=20
couple of times before....) Either way, it makes a very sturdy amp =
with abt 15=20
- 20dB gain and from my experience the</FONT></DIV>
<DIV><FONT size=3D2>only thing that can take the life out of that tube =
(in=20
Ham-use), is if you use a hammer....!</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>73 GL de Lars/SM3BDZ</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Ursprungligt meddelande ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>Fr=E5n:</B>=20
<A href=3D"mailto:fgrisafi@tin.it"; title=3Dfgrisafi@tin.it>Fabio =
Grisafi=20
(IT9GSF)</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Till:</B> <A=20
href=3D"mailto:amps@contesting.com"=20
title=3Damps@contesting.com>amps@contesting.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Skickat:</B> den 18 oktober 1999=20
23:32</DIV>
<DIV style=3D"FONT: 10pt arial"><B>=C4mne:</B> [AMPS] QBL 5-3500 - =
How to feed=20
it ?</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>Ho wto feed the power thetrode QBL5-3500 by =
Philips ?=20
Anyone uses that external anode</FONT></DIV>
<DIV><FONT size=3D2>old TV Band I and FM tube ? I wish to use it on=20
HF...</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>73 !</FONT></DIV>
<DIV> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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