[Amps] input matching question on the YC156?

[craxd]

Jim,
Your correct, it will work also. Just limits the cathode current down on 
idle.

Will


Message: 2
Date: Fri, 17 Sep 2004 14:46:56 -0700
From: "K7RDX" <k7rdx at earthlink.net>
Subject: Re: [Amps] input matching question on the YC156?
To: "craxd" <craxd1 at ezwv.com>, <amps at contesting.com>
Message-ID: <001d01c49cff$db39ac40$7370b041 at k6u5b8>
Content-Type: text/plain;    charset="iso-8859-1"

It`s my common practice to have a 50k (Or so) resistor in the negative lead
shorted by a relay during transmit...I find this to be less tramatic to tube
stability in my amps as opposed to totaly opening up neg on standby....Works
for me...Jim.
----- Original Message -----
From: "craxd" <craxd1 at ezwv.com>
To: <amps at contesting.com>
Sent: Friday, September 17, 2004 9:32 AM
Subject: Re: [Amps] input matching question on the YC156?



 >> Bill,
 >> In any amps I've made, I did kill the B- lead for the HV until the
 >> antenna relay pulled in even though it was biased to cutoff on idle. The
 >> reason being is that if the bias ever failed while the amp was at idle,
 >> you'd have a run-away situation that would happen fast. On tetrode amps,
 >> the screen has to be killed with the B+ plate. This is an extra I always
 >> did but the cost keeps the manufacturers from adding it. This will also
 >> kill an amp that might be prone to self oscillation on idle. I'm not
 >> saying that what they do is a design flaw but I'd like to see all of
 >> them include it.
 >>
 >> Will Matney
 >>
 >>
 >> Is this true even when the tube is biased into cutoff?  I've owned
 >> four commercially-made amps and all of them apply HV as soon as the
 >> power switch is turned on, but all four have the tube biased into
 >> cutoff.  Are you saying that is a design error?
 >>
 >> --
 >> Bill W6WRT
 >>
 >>
 >> _______________________________________________
 >> Amps mailing list
 >> Amps at contesting.com
 >> http://lists.contesting.com/mailman/listinfo/amps
 >>





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