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To: rsgb_lf_group@blacksheep.org
Date: 26 Feb 2005 18:29 GMT
Message-ID: <1D56h9-25OsvA0@fwd03.sul.t-online.com>
Subject: Re: LF: Re: Re: 807s
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If someone is in need of these tubes: I still have two of them


    Heinz, DM2BHG


"Walter Staubach" <walter.staubach@fen-net.de> schrieb:
> Thanks, Peter, for more infomation. We talk about the same 807, hi.
> 73   Walter
> 
> -----Ursprüngliche Nachricht-----
> Von: g3ldo <g3ldo@ukonline.co.uk>
> An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
> Datum: Samstag, 26. Februar 2005 00:35
> Betreff: LF: Re: 807s
> 
> 
> >From: "Walter Staubach"
> >       is "your" 807 the same tube as I remember: PA-tube, 6V heater, anode
> >loss 25W, anode voltage 400 to 700V, penthode.
> >It was used for homebrew transmitters, often with the GELOSO-VFO ( CW and
> AM
> >only ). One connection ontop of the glass, I think that was anode. A rather
> >big tube. If it is the same - why building a receiver with it?   :-)
> >
> >The 807 was the most popular PA tube for HB in the 50s and 60s. They were
> >plentiful and reasonably cheap and could handle a lot of misuse. They were
> >tetrodes with an anode (plate) topcap.With a maximum PA voltage of around
> >750v and a current of 100mA they could put out around 40 or 50w.
> >I used a couple of 1625s (12.6v heater equivalent of the 807) in a zero
> bias
> >pushpull high level modulator.
> >The Geloso VFO was my first ever commercial ham radio purchase. I modified
> >it by replacing the 6V6 driver with a QVO-47.
> >I think the reason these high power tubes were used in receiver
> distribution
> >amplifiers is that they operated in the linear portion of the curve no
> >matter what large signal strength signals appeared in the passband.
> >
> >Nostalgia aint what it used to be!
> >
> >Peter G3LDO
> >
> >
> 
> 
>