Re: [Amps] QB3-300 Amplifier

["Peter Frenning, OZ1PIF" <oz1pif@privat.dk>]

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
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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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