Thanks, Peter, for more infomation. We talk about the same 807, hi.
73 Walter
-----Ursprüngliche Nachricht-----
Von: g3ldo <[email protected]>
An: [email protected] <[email protected]>
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
>
>
