[Boatanchors] Fwd: Re: [regenrx] "Tube Number" ethics & another "Trial run"

Wed Jul 29 12:07:05 EDT 2015

See my reply on the regen list - or - just read it here:

-------- Forwarded Message --------
Subject: 	Re: [regenrx] "Tube Number" ethics & another "Trial run"
Date: 	Wed, 29 Jul 2015 12:05:03 -0400
From: 	Bill Cromwell <wrcromwell at gmail.com>
To: 	regenrx at yahoogroups.com

Hi Phil,

Some hams only count tube sockets/envelopes. Some, including me, count
functional structures. The former would say five tubes (misleading
others about the complexity of the radio) and the rest of us would
counter that there are seven tubes (valves) in there - plus the
rectifier. The latter gives a more accurate picture of the functional
blocks built into the radio.

Of course, this isn't going to change anybody's mind about how to count
them. But now you have my two cents (which in 2015 pennies is about $48.07).

73,

Bill  KU8H

On 07/29/2015 11:49 AM, Phil ko6bb1 at gmail.com [regenrx] wrote:
>
> Just a quick (maybe tongue in cheek) question on tube counts.
>
> First, who remembers back in the early days of transistor radios when
> manufacturers would "bloat" their transistor count on the front of the
> radio by putting 'extra' transistors in diode positions, and sometimes
> even transistors that did absolutely nothing at all?
>
> OK, now to the present. As most of you can see, I keep an "equipment
> tally" in my signature line, mainly because on a couple DX lists I've
> been frequently asked (often in private emails) what equipment I use,
> and it's become a practice of some of us longtime members to put a "brag
> sheet" at the bottom (particularly on the NDB beacon list).
>
> The regen set that I built has 5 tubes, 6AK5, 12AU7, 12AT7, 6AK5 & 0B2.
> BUT two of the tubes are dual triodes, and if all separate tubes were
> used would be 7 tubes + rectifier. ONLY ONE of those tubes (1/2 12AU7)
> doesn't actually add to the performance of the set but is in there as a
> convenience feature, to provide a output for a frequency counter during
> calibration.
>
> QUESTION: Would it be misleading of me to call this a "7 Tube +
> rectifier" set in general correspondence about it, signature block etc?
> It's not like I'm trying to market a radio and some buyer got one and
> said "HEY, I've been shortchanged two tubes"!
>
> Last night I again listened to it to see what beacons could be heard. I
> heard another 6 beacons last night, all Canadians, ALL after midnight,
> making the total about 32. The T-storm noise has been horrendous
> (typical summertime) and my ears are pretty well beat to death by the
> time the band opens up (listened until 1:00AM last night).
>
> I think that I'm going to have top build an "noise clipper" in the set
> with a pair of germanium diodes. I was trying to stay away from ALL
> Sand-state devices and use ONLY technology available in the '30s. I
> KNEW I should have punched a tube socket hole for a 6AL5 dual diode!
>
> --
> 73 de Phil, KO6BB
> http://www.qsl.net/ko6bb/ (Web Page)
>
> PRESENT RADIOS:
> Grundigs: S-350 (~2006), G6 (2011) & S450DLX (2014).
> HOMEBREW: 7 Tube+Rect Regenerative RX for LF (built 2015)
> Icom: R-75 With Cascaded 250 & 125Hz CW Filters. (~2005)
> Icom: IC-7200 Transceiver (~2015).
> Radio Shack: DX-380 digital portable (~1990).
> Zenith: Royal-7000 Transoceanic Portable (~1968).
>
> ACCESSORIES: HOMEBREW LF-MF Pre-Amp, MFJ-993B HF Auto-Tuner.
> HOMEBREW 8 Hz Audio Filter.
>
> ANTENNAS: 88 foot Long Ladder-line fed dipole at 35 feet AGL.
> HOMEBREW Active Mini-Whip at 36 Feet AGL for LF/MW.
> HOMEBREW 37 foot "Low Noise Vertical" at 11 feet AGL for LF/MW/SW.
>
> Merced, Central California, 37, 18, 37N 120, 30, 6W CM97rh
>
> __._,_.___
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> Posted by: Phil <ko6bb1 at gmail.com>
> ------------------------------------------------------------------------
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