[AMPS] Additional Tube Brand Question

[Barry Kirkwood]

As I recall ran about 3kV with better than 5% regulation.
Cannot recall resting dissipation, but it would have been OK.
If high the way to go is to increase the value of zener bias, IMO.
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: Michael Tope <W4EF@dellroy.com>
To: <k5go@alltel.net>; Barry Kirkwood <bjk@ihug.co.nz>
Cc: Jason Cooper <jbcooper@uswest.net>; <amps@contesting.com>
Sent: Friday, 02 February, 2001 2:20 AM
Subject: Re: [AMPS] Additional Tube Brand Question


> Stan,
>
> Do you know what the resting Ep rating was for the stock L-4B? My L-7
> run around 2500V, and I am wondering how much higher I can run that
> before I start having to change tank components and the like. IOW, when
> you substituted the HB supply, how much if any did you raise the plate
> voltage?
>
> 73 de Mike, W4EF..........................................................
>
> ----- Original Message -----
> From: "Stan Stockton" <k5go@alltel.net>
> To: "Barry Kirkwood" <bjk@ihug.co.nz>
> Cc: "Jason Cooper" <jbcooper@uswest.net>; <amps@contesting.com>
> Sent: Wednesday, January 31, 2001 7:57 PM
> Subject: Re: [AMPS] Additional Tube Brand Question
>
>
> >
> > Without question, replace the power supply with something a lot heavier
> > and with more plate voltage than the original.  Remember that it was
> > designed when the legal limit was about 40% (1000W INPUT) of what it is
> > now.  However, if you run it at that level, it will probably last a long
> > time.  I had the original power supply in one catch on fire while a
> > guest operator was working the Phone Sweepstakes Contest in about 1984.
> > Now have HB supplies with about 3600V and the amplifier puts out 1500W
> > with 100W or less drive.  Good idea to put a muffin fan on the top
> > cabinet above each tube blowing up.  Otherwise, you can cook breakfast
> > on the top cabinet.
> >
> >
> >
> >
> > Barry Kirkwood wrote:
> > >
> > > I used an L-4B happily for years with the original parasitic
> > > suppressors.
> > > I added a reduction drive to the plate tune capacitor. I also built a
> > > bigger and better power supply.
> > > The L-4B was an excellent performer and I only quit it for a model
> > > that had 160m capability.
> > > 73
> > > end
> > > Barry Kirkwood PhD ZL1DD
> > > Signal Hill Homestay
> > > 66 Cory Road
> > > Palm Beach
> > > Waiheke Island 1240
> > > NEW ZEALAND
> > > www.waiheke.co.nz/signal.htm
> > >
> > >      ----- Original Message -----
> > >      From: Jason Cooper
> > >      To: amps@contesting.com
> > >      Sent: Thursday, 01 February, 2001 8:59 AM
> > >      Subject: [AMPS] Additional Tube Brand Question
> > >
> > >      Hi All,
> > >      I am about to re-tube my L-4B and have the same
> > >      question concerning the 3-500Z.   In addition, what mods
> > >      are available for the L-4?   I have read Measure's articles
> > >      on amps and agree with the soft start and the glitch
> > >      resistor.  I plan to incorporate these when I
> > >      change tubes and am also interested in other mods available
> > >      for the L-4.
> > >      Thanks in advance,
> > >      Jason KN7AZ
> >
> >
> > --
> > FAQ on WWW:               http://www.contesting.com/FAQ/amps
> > Submissions:              amps@contesting.com
> > Administrative requests:  amps-REQUEST@contesting.com
> > Problems:                 owner-amps@contesting.com
> >
> >
>
>


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