572B

[Gary Schafer]

Mark,

You are absolutely correct!

73
Gary  K4FMX

Mark S Graalman wrote:

>  However, only using two will lower the load on the filament transformer
> and may cause the filament voltage to be too high which will greatly
> reduce
> the emissive life of the filaments. If only two tubes are being used, I
> would
> make sure the filament voltage remains in spec.
>
> Mark  WB8JKR
>
> On Fri, 31 Mar 2000 11:00:36 -0500 Gary Schafer <gschafer at MEDIAONE.NET>
> writes:
> > If you are running 752Bs in the 30L1 you really only need 2 of them.
> > There is no point in
> > putting 4 of them in there as the power supply is not big enough for
> > 2 kw that 4 572Bs are
> > capable of. Save your money! Although with 4 of them they should
> > last a life time. You
> > would cook the power supply before you would hurt the tubes.
> > One 572B will handle a little more power than a pair of 811As.
> >
> > 73
> > Gary  K4FMX
> >
> >
> > Carl Hyde wrote:
> >
> > > Lots of 30L-1s run 572Bs. Its no problem although
> > > quite a lot more expensive to buy 4 of them. I use the
> > > Svetlana tubes because they appear to be more rugged
> > > and have ceramic base and plate cap. I just put a set
> > > into an SB-200 and it works great.
> > >
> > > --- Bob Meyer <Rascal at UTEC.NET> wrote:
> > > > I havent had a amp here with 572B tubes yet.
> > > >
> > > > are they bigger than 811A.
> > > > The collins does not have much room.
> > > >
> > > > There is a little more room to play with on
> > > > heathkit.
> > > >
> > > > Any  one tryied 572B tubes in
> > > > Collins 30L1?
> > > >
> > > > I will look for spec sheet on 572B..
> > > >
> > > > Robert,
> > > >
> > > >
> > >
> > > =====
> > > Carl HYDE
> > > W2CSH

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