[Amps] input tuning

[Carey Lockhart, KC5GTT]

well that was easy. and you where right Colin. the fix was just a matter of 
moving ctk in front of cck rather than following cck. presto super match and 
gained almost 200w out. the design is the yu1aw 2m ptfe. i have built 
several of these now and they all have had some little somthing tweaky. now 
i think i want to get away from the ptfe and use doorknob caps at the end of 
the plate line. any thoughts on this guys?

Carey, lc5gtt
----- Original Message ----- 
From: "k7fm" <k7fm at teleport.com>
To: "Carey Lockhart, KC5GTT" <kc5gtt at gmail.com>
Sent: Tuesday, June 21, 2011 12:10 AM
Subject: Re: [Amps] input tuning


> Hi Carey:
>
> I am not familiar with either the amp or the tube, but it sounds like you 
> have some reactance you are tuning out with the screwdriver.  If the 
> screwdriver adjusted cap is series, then a small parallel cap to ground 
> should be able to tune out the reactance.    Or, just put a copper tab on 
> the solder joint and bend it back and forth to get the correct capacitance 
> to ground.
>
> 73,  Colin  K7FM