I have never been able to make an 807 work in GG for that reason.
73
Gary K4FMX
Bill Fuqua wrote:
> An 807 would probably oscillate cathode driven due to the fact that the
> suppressor (beam forming plates) are
> connected to the cathode internally thus providing a lot of plate to
> cathode capacitance. The choice of going
> to grid driven is not bad at all.
>
> 73
> Bill wa4lav
>
>
>
> At 10:29 PM 3/16/2003 -0500, you wrote:
>
>> ----- Original Message -----
>> From: "Bill L. Fuqua" <wlfuqu00@uky.edu>
>> To: <garyschafer@attbi.com>
>> Cc: <amps@contesting.com>; <n1rj@pivot.net>
>> Sent: Sunday, March 16, 2003 6:45 PM
>> Subject: Re: Re: [Amps] Membership
>>
>>
>> > Unfortunately there are a number of hams that came up thru the CB ranks
>>
>> Yes, I'll confess to that...some 30 years ago. All my CB buddies,
>> building
>> GG sweep tube amps, told me that anything grid driven would be unstable,
>> oscillate, and just be unusable. That was just the motivation I needed
>> to go
>> ahead with building a four 807 amp. They were right, it was quite the
>> oscillator. Then I learned about neutralization and parasitic
>> suppressors.
>> Soon those 807's were running smooth as silk. At the time I was
>> working on
>> my ham ticket, but CB was there and it was a place to experiment with RF.
>> Once I got my ticket I traded the amp for a 50' tower, but I sometimes
>> wonder what ever became of that amp. It was a beauty...there is something
>> about 807's...a romantic type something...
>>
>> Jeff - K1LE - CT ><>
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>
>
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