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@earthlink.net>
Subject: Re: [Amps] input matching question on the YC156?
To: "craxd" <craxd1@ezwv.com>, <amps@contesting.com>
Message-ID: <001d01c49cff$db39ac40$7370b041@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@ezwv.com>
To: <amps@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
>>
>>
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>>
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