[Boatanchors] Yet another tube question

[Sandy W5TVW]

Like P.T. Barnam once said: "There's a sucker born every minute"  (I think 
that's how the quote goes)
Reminds me of a local ham many years ago.  He was a simple minded fellow. 
He used to use a "Halo" antenna on a small mast for his 6 meter AM 
operations.  Someone told him of something called "halo grease" that made 
the RF signal escape the antenna better.  This chap bought some from one of 
the perpetrators of the joke and paid someone else to apply it to the 
antenna.  He swore it helped his signal!  It was all done in this instance 
as a practical joke.  No one ever told him it was a joke and he believed it 
DID work!

73,
Sandy W5TVW

(No!  I wasn't involved!)
----- Original Message ----- 
From: "Albert LaFrance" <lafrance at att.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, February 05, 2007 8:46 PM
Subject: Re: [Boatanchors] Yet another tube question


> Here's a great example of "audiophool" products:
> http://www.audioasylum.com/audio/general/messages/104180.html
>
> Albert LaFrance
>
> ----- Original Message ----- 
> From: "Bob Young" <youngbob53 at msn.com>
> To: <boatanchors at mailman.qth.net>
> Sent: Monday, February 05, 2007 12:44 PM
> Subject: [Boatanchors] Yet another tube question
>
>
>> I'm a musician, a bass player to be exact and I use 300 WRMS Ampeg SVT's
>> with 6 6550's, 3 in parallel on each side. I didn't buy matched tubes the
>> last time although I agree they are clearer sounding, I like a little 
>> grit
>> in my sound. Also matched tubes for a guitar player not only gives him 
>> more
>> power it also makes the distortion that most guitar players use a little
>> more uniform and clean (is not a contradiction, really). Audiophool for 
>> me
>> starts when an audiophile feels that he "hears" a difference between #14
>> lamp cord speaker cable and some "magic" cable for 100 bucks with gold
>> plated connectors. I've used matched tubes in my audio stereo amps though
>> and have used matched sets in my SVT, just can't justify the added 
>> expense
>> for them when I'm playing rock n roll loudly and can't hear the 
>> difference
>> anyway. I do buy good tubes though and next time probably will buy 
>> matched
>> sextets of them, Svetlana makes good tubes for Russian, last a long time 
>> and
>> sound good,
>>
>> Bob young
>> Millbury, Ma
>> KB1OKL
>> >
>> >Message: 2
>> >Date: Mon, 5 Feb 2007 19:20:23 +1100
>> >From: "Brian A Clarke" <brianclarke01 at optusnet.com.au>
>> >Subject: Re: [Boatanchors] Yet another tube question
>> >To: <boatanchors at mailman.qth.net>
>> >Message-ID: <012f01c748fe$7c19b0e0$0202a8c0 at Belkin>
>> >Content-Type: text/plain; charset="iso-8859-1"
>> >
>> >Just a moment fellas,
>> >
>> >Selecting tubes for RF PAs doesn't need to be too accurate. What you 
>> >need
>> >to
>> >bear in mind is that if you have a set designed to deliver 400 W from 
>> >two
>> >tubes in parallel, and one of those tubes is a bit low in performance, 
>> >and
>> >the operator tries to get the full bottle, then the life of both tubes 
>> >will
>> >be shortened because of the excessive temperature rise. Balance within 
>> >20%
>> >is probably close enough.
>> >
>> >In audio applications, there is a very good reason for balancing tubes'
>> >emissions much more accurately, and that is that if there is an 
>> >imbalance,
>> >then the secondary of the output transformer will be passing some net DC
>> >that will go towards magnetising the core and thus reducing the 
>> >inductance.
>> >This will change the shape of the hysteresis curve and have two 
>> >effects -
>> >distortion on high powered peaks that wasn't there before, and loss of
>> >bass - the OPT needs inductance in order to have enough reactance at the
>> >lower frequencies. For stage musicians, balancing the output tubes 
>> >allows
>> >more power output before distortion sets in - very handy. Most musically
>> >inclined folks can hear these effects quite easily - dubbing them
>> >'audiofools' is a sign of ignorance.
>> >
>> >73 de Brian, VK2GCE.
>> >
>> >
>> >
>>
>>
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>> ** List Administrator - Duane Fischer, W8DBF/W9WZE **
>> ** For Assistance: dfischer at usol.com **
>> $$ For vintage radio info, see the HCI web site $$
>> http://www.w9wze.org
>>
>>
>
> _______________________________________________
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> ** List Administrator - Duane Fischer, W8DBF/W9WZE **
> ** For Assistance: dfischer at usol.com **
> $$ For vintage radio info, see the HCI web site $$
> http://www.w9wze.org
>
>
>
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