Re: [Amps] new amp race

["Carl" <km1h@jeremy.qozzy.com>]

The real problem is the layout and anode coupling to everything around it, 
it is not a tube to be put in the smallest possible enclosure unless it is 
plywood!
The added L before the the Tune cap or the normal10M coil tapped by the Tune 
cap concept has been around since the 30's for the big tubes used in SW 
Broadcasting.
The YC-156 is easy to get on 15M and requires some TLC with the input and 
output circuitry in order to get good efficiency on 10. Heck, the MRI 
machines that use it are up at 60 mHz.



----- Original Message ----- 
From: "Jeff AC0C" <keepwalking188@ac0c.com>
To: "Bill Turner" <dezrat@outlook.com>; "Amps group" <amps@contesting.com>
Sent: Tuesday, May 23, 2017 9:16 PM
Subject: Re: [Amps] new amp race


> Uh huh.  There is Cout that is manageable -- and then there is the YC156. 
> I am pretty sure that anyone who has actually been-there, done-that with 
> this tube - would use the term "easily" in conjunction with the work 
> needed to make that tube and the upper bands play together.
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message----- 
> From: Bill Turner
> Sent: Tuesday, May 23, 2017 6:53 PM
> To: Amps group
> Subject: Re: [Amps] new amp race
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Tue, 23 May 2017 16:46:59 -0500, you wrote:
>
> > The second and more serious
> > issue is the Cout on the YC156 is massive.  Getting that tube to run on 
> > 20m+
> > takes work.  It can be done but it is a challenge even if you have serious
> > skills and time.  Of course on 40m & below, the Cout is not a problem.
> >
> > 73/jeff/ac0c
> REPLY:
>
> Easily fixed with the L-network described in any recent ARRL handbook
> in the amplifiers section. Requires just one small coil in the plate
> lead and like magic, the Cout problem is gone.
>
> 73, Bill W6WRT
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