[Amps] High C out

[Will Matney]

Well, I wasn't for sure as I cant decipher what he wants. He mentioned  
wanting to know how to increase the inductance by 300 nH, which squeezing  
the coil would raise it. In a Pi-L, the load C is in between the two coils  
and tune C at the coupling capacitor off the anode. In other words, the  
added coil is between load C and the load. Without knowing what he wants  
to do for sure, about the only thing I could advise is answer his question  
about how to raise inductance by 300 nH. With a circuit description in  
detail, what he's wanting to accomplish, and at what frequency, I dont  
know what else to tell him.

Will



On Fri, 21 Jan 2005 13:22:02 EST, <Dennis12Amplify at aol.com> wrote:

> Will,
> I believe Chris is talking about converting from a PI network to  a Pi-L
> network. The Pi-L having two levels of impedance matching, and a little   
> more
> harmonic suppression, than the original Pi network.
>  Thus the original Tune C becomes the middle capacitor of the Pi-L,   
> allowing
> for a larger value of C, and the plate C is now the new Tune C.
>  Also, If his tune cap is already backed all the way out, he needs  LESS
> inductance in the tank to tune it, not more... Therefore he would be   
> SPREADING
> the coil turns apart, or removing a turn, or moving the tap towards   
> less turns,
> any of which would result in less inductance in the tank  circuit....
> Regards,
> Dennis O.
> In a message dated 1/21/05 11:49:21 AM Central Standard Time,
> craxd1 at ezwv.com writes:
>
> A 300 nH  coil (0.3 uH) is not very much. Assuming this would be the tank
> coil, the 10 meter end being the largest in size, one might just  squeeze
> the coils together to raise the inductance enough to bring  it in tune.  
> If
> not, adding 1 to 2 turns of the same size wire, and  same diameter would
> most likely do it. A dip meter would be easier  to use to find the exact
> placing of the tap on the coil if it has  taps. According to the way the
> tube is ran and tube type, some at a  higher frequencies dont need a  
> tune C
> in order to tune correctly  because the tubes output C is high enough and
> takes care of it. In  the amps I've seen this way, a load C was all that
> was  used.
>
> Will
>
>
> On Fri, 21 Jan 2005 09:00:56 -0800, Chris  <rfcrazy at cox.net> wrote:
>
>> Can anyone tell me what size wire  and dimensions to use for a 300 nH
>> coil? I don't have an inductance  calculator.  I am having a problem  
>> with
>> a 3cpx5000 that has high  C Out.  The tune vacuum cap is a backed all  
>> the
>> way out in order  to tune. I read on web site that you can use a 300 nH
>> coil from anode  to C1 to rectify this.
>> Thanks for the help,
>>  Chris
>
>
>
>
>
>
> __________ NOD32 1.880 (20040928) Information __________
>
> This message was checked by NOD32 antivirus system.
> http://www.nod32.com
>



-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/