Re: [Amps] 2 x 8877

[Alek Petkovic <vk6apk@eon.net.au>]

At 10:22 AM 29/02/2004 -0500, Ed Briggs wrote:
> Regarding glass windows, I've seen them in pictures, and always wanted an
> amp with one, but was always concerned about RF leakage and the possibility
> of long term exposure to VHF harmonics, particularly when I got up close to
> the window to admire the tubes.
>
> Are there practical techniques to safeguard against these issues in HF amps?
> I like the way a 4-1000a looks too..



Surely, a front door glass and screen from a microwave oven would do the trick.

Alek, VK6APK


> (The emphasis here is on safe nostalgia, not contemporary design
> techniques.)
>
> Regards to all
>
> Ed
> ----- Original Message -----
> From: "Mike McCarthy, W1NR" <w1nr@eecorp.com>
> To: "P. Coppin" <copa054@cira.it>; <Amps@contesting.com>
> Sent: Saturday, February 28, 2004 9:26 AM
> Subject: RE: [Amps] 2 x 8877
>
>
> > The Alpha SX had issues on 10M because of the capacitance of the two
> > tubes.  Also, 2x8877 is more expensive than 3x3cx800.  With the 3cx800,
> > the plate voltage is lower, required capacitance is lower, voltage
> > ratings of tank components is lower translating into a more cost
> > effective design.
> >
> > Still, nothing impresses me more, at least visually, than a pair of
> > 4-1000's built into a cabinet with windows...
> >
> > Mike, W1NR
> >
> >
> > -----Original Message-----
> > From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> > Behalf Of P. Coppin
> > Sent: Friday, February 27, 2004 8:29 AM
> > To: Amps@contesting.com
> > Subject: [Amps] 2 x 8877
> >
> >
> >
> > First of all, sorry for my poor english.
> >
> > I would like to know the reason why the amps manifacturers build linear
> > amps
> > using three 3cx800a7, 2 3cx1200a7, one 3cx3000a7 and ruskies but no one
> > build a linear amplifire with 2 3cx1500a7 (8877) such as the Alpha sx.
> > What problems they could have ?
> >
> > 73
> > Paul i8ixo
> >
> >
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> >
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