[Amps] Panasonic tube radio

[lncarman]

I have to agree with you Rob. Seems to me that a lot of your modern SS stuff 
is
RF prong.  Almost all the computer audio systems are affected when subject
to strong RF. There's lots of the cheaper AM/FM stereo equipment as well as 
some mid-range
to high price gear that like to rebroadcast unintelligible garble
from their speakers when subjected to a clean HAM RF transmissions. My 
neighbor's
TV and computer speakers are like that. They told me so "IN BOLD LETTERS".
I offered to fix my neighbors problem but they haven't accepted my generous 
offer yet.
But ......!  It's ok that their dogs bark all day and night. Dogs are dogs 
you know.
They are supposed to bark. It's ok if they keep you awake on a crisp night 
when
you sleep with your window open.
Didn't mean to get off the dog thing ..... sorry.
I had one neighbor accuse me of blowing up his AM/FM boom box he used in his
garage.
To fix my computer speaker problem, I had to completely enclose the audio 
amp section
in metal to stop the RFI.  All other previous attempts using ferrite, etc... 
failed.

Larry N5BIP


----- Original Message ----- 
From: "Rob Atkinson, K5UJ" <k5uj at hotmail.com>
To: <amps at contesting.com>
Sent: Saturday, September 11, 2004 1:23 PM
Subject: [Amps] Panasonic tube radio


> My dad would be getting a laugh about this if he were alive as he would 
> recall the days when all car radios were tube radios, hi.
>
> I have to admit I employ a tube mic preamp on phone and to my ears it 
> really does sound better.  The hybrid audio gear defeats the purpose of 
> tubes not only because some of the components are SS but also because 
> usually the plate voltage on the tube(s) is too low to get the tubey 
> sounding benefits.  Now that tubes have this cachet among audiophiles, 
> regular humdrum tube circuits are costing 10 or 20 times more than they 
> ought to.  I have a couple of old all-tube mw bc receivers I picked up at 
> a flea-market for about 5 bucks each.  If they were modern they would 
> probably sell for $200.
>
> I wonder about another benefit of audio tube gear in a high RF 
> location--the avoidance of RFI from SS diode type rectification.  I have a 
> pair of computer speakers in the shack that are unuseable when I transmit 
> because they are in cheap plastic unshielded enclosures and one cabinet 
> contains a 10 w. ss amp to boost the sound card audio and drive the 
> speakers.  This thing rectifies RF and goes crazy when I transmit.  I have 
> thought about buying a small all tube guitar amp to use in its place on 
> the theory that the diode rectification prob. would go away.  Does this 
> seem like a good idea? I've tried ferrite cores and shielding--all no gud.
> tnx
> rob/k5uj
>
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