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Re: [Amps] QB3-300 Amplifier

To: "Peter Frenning, OZ1PIF" <oz1pif@privat.dk>,"Alberto" <re349@yahoo.com>, <amps@contesting.com>
Subject: Re: [Amps] QB3-300 Amplifier
From: Alek Petkovic <vk6apk@eon.net.au>
Date: Thu, 28 Oct 2004 21:30:31 +0800
List-post: <mailto:amps@contesting.com>
Yep, I'll second that. I built a sinfully ugly, cheap and indestructible amp with a pair in GG. Still working as good as ever 15 years on with the original tubes.

73, Alek.
VK6APK

At 07:54 PM 28/10/2004, Peter Frenning, OZ1PIF wrote:
These tubes work very well in GG, see my FL2000 conversion on my homepage below..
(They are low power relatives of the QB3,5/750 and QB4/1100 etc)


Vy 73 de OZ1PIF, Peter

**********  OZ1PIF **************
email: oz1pif(no-spam-filler)@privat.dk
http://home24.inet.tele.dk/oz1pif/
Ph. +45 4619 3239
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************
----- Original Message ----- From: "Alberto" <re349@yahoo.com>
To: <amps@contesting.com>
Sent: Thursday, October 28, 2004 1:44 PM
Subject: [Amps] QB3-300 Amplifier


Hello!

Recently, i got some spare QB3-300 tubes (equivalent
SRS455, 6155, 4-125), so I´m planning a new SSB
amplifier using them. I've seen lots of configurations
for these tubes in PA operation. Watching tube
datasheet, it seems like grid driven class B operation
would work: Va=2500V; Vg2=350V; Vg1=-40V aprox.

Some PA builders say also g-g configuration would
work; that is grid and screen connected and grounded
together. (I don't think so)

I'd like to know the usual ratings for amateur SSB
operation. Has anybody experience using QB3-300 in PA?

Thanks!
Alberto
EA4PL



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