To: rsgb_lf_group@blacksheep.org Date: Fri, 25 Feb 2005 13:29:18 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.1 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 X-Virus-Scanned: ClamAV version 0.83, clamav-milter version 0.83 on helene.f3n.de X-Virus-Status: Clean X-SPF-Result: relay.thorcom.net: 212.204.115.10 is neither permitted nor denied by domain of fen-net.de X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,HTML_40_50=0.086,HTML_MESSAGE=0.001 Subject: Re: Re[2]: LF: Off Topic Ft101zd Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

Dear Pat and All,

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? :-)

73 Walter DJ2LF

-----Ursprüngliche Nachricht-----
Von: G4gvw@aol.com <G4gvw@aol.com>
An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Datum: Freitag, 25. Februar 2005 00:05
Betreff: Re: Re[2]: LF: Off Topic Ft101zd

Hi All.

John, I can remember building a Rx using three 807's in which one was strapped as a triode as RF amp. In the mid 1950's they were often for sale at less than one shilling each (I shilling = 12 pence, £1 = 240 pence brfore the UK went decimal coinage). They would run with 45VDC on anode (plate) as HT (B+). For an impoverished schoolboy they were magic! When "three-legged fuses" arrived many of us were shocked that someone had invented a destructable active device which didn't have a filament (heater), couldn't be made to glow purple and would "destruct" without a visible sign to suggest that it had ever been connected to an electrical supply !

However, my ability to construct a Rx in a Woolworth plastic lunch box which would provide test match commentary in a corner of the school yard at lunchtimes with three-legged devices identified only by the colour of a paint spot, gained me so much popularity from my fellows (I cannot now remember what the equivalent epithet to "nerd" was) that I soon stopped believing that RCA 807 = "The Holy Grail" !

73 de Pat g4gvw