I've another question on this subject.
A ham I've been talking to is aware of a mod that switches out the pa 
tubes and only uses the driver for output. he apparently accomplishes 
this by the flip of a switch. actually he uses a magnetic reed switch 
and can switch his finals in and out when he wants. it's apparently an 
old novice mod but I can't find any info on the net about it.

Shaun
web sites:
http://www.myspace.com/blindmanshaunoliver
http://blindman.homelinux.org/~blindman/
skype: brailledude


On 17/05/2008 7:07 AM, the old scribe known as Keith Barrett was able to 
impart this pearl of wisdom:
> Well said, you will be well on your way to passing that exam.
> 
> 
> On 16 May 2008 at 9:30, Shaun Oliver wrote:
> 
>> well,, firstly, I'm waiting for vision australia to transcribe the 
>> manual into daisy format, so don't know if the 201 has a processor on board.
>> and I too, would have thought that running your tubes at a lower voltage 
>> would have some kind of effect on them. I'm just not sure it's a good 
>> one. because I suspect that the tuning procedure is as much matching the 
>> radio's impedance to that of your feed line as it is to get the maximum 
>> efficiency out of your tubes.
>>
>> Shaun
>> web sites:
>> http://www.myspace.com/blindmanshaunoliver
>> http://blindman.homelinux.org/~blindman/
>> skype: brailledude
>>
>>
>> On 16/05/2008 1:48 AM, the old scribe known as Colin McDonald was able 
>> to impart this pearl of wisdom:
>>> hmmm, you should be able to adjust your plate control to reduce power
>>> without drastically effecting the tubes longevity.
>>> Also, does the 201 not have a processer onboard?  If so, you can use the
>>> mike gain to reduce power, and the processer to insure maximum output at
>>> that level without having the inherent problems that low mic gain will
>>> cause.
>>> If no processer, then some sort of combination between lowered mike gain and
>>> adjusting the plate or load controls should help to get your power down to
>>> the "legal" limit for your license class.
>>> Of course, the load and plate also effect the receiver so you'll have to
>>> figure some workable combination out there.
>>> Also I can't quite understand how running tubes at a fraction of their
>>> output capability could actually reduce their longevity.
>>> in the audio world, running tubes at lower voltages and reduced output
>>> actually makes them last longer.
>>> regards
>>> Colin
>>> ----- Original Message ----- 
>>> From: "Shaun Oliver" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Thursday, May 15, 2008 7:33 AM
>>> Subject: power mods for tube rigs.
>>>
>>>
>>>> Hi guys, I'm just that much closer to gaining my license. sent away for
>>>> my foundation license manual today. now. the issue is, I wanna run my
>>>> radio at 10w and simply backing the mic gain off won't cut it.
>>>> is there a mod I could have a qualified tech do to reduce the output on
>>>> my old yaesu ft-201? if so, what's involved?
>>>> thanks in advance guys.
>>>>
>>>> -- 
>>>> Shaun
>>>> web sites:
>>>> http://www.myspace.com/blindmanshaunoliver
>>>> http://blindman.homelinux.org/~blindman/
>>>> skype: brailledude
>>>>
>>>>
>>>>
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> 
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