[AMPS] Output power 8877

[km1h@juno.com]

On Sun, 14 Mar 1999 13:59:38 -0600 "Roy Koeppe" <royanjoy@ncn.net>
writes:
>
>From everything I've ever read, ferrite is inappropriate for a tank 
>inductor
>core. Powdered iron is appropriate. The toroid core's dimensions for
>legal-limit power level is that of Amidon's T-400-A, which is 4-inches 
>by
>1-inch. I have used this core on 160M, 80M and 40M with no heating in 
>my
>3-500Z (2) amp. 

I should think not!

B&W used a 3 stack of T225-2A in the PT-2500A ( 2x 3-500's at 3500V) for
160M and a seperate 2 high stack for 80/40M Pi coils.  Never had any
drift problems even during a full bore contest. The L coil was airwound
Pi-Dux.
There was an arc over problem to the toroid cores until they switched to
a double wrap of Scotch 27 glass tape plus changing the Pi-L parameters a
bit. This goes back to 1986.

73  Carl  KM1H

(3-KV) Q=12, PI-L. I use two T-200 cores (stacked) in 
>the L2
>inductor. Windings are spaced so that about a 2-inch gap exists in the 
>L1
>inductor. This was a single-bander amp, so no taps were ever tried--my 
>point
>being the core was fully wound in each case up to the 2-inch gap on 
>each
>band. Glass tape is used to insulate the core from the winding.
>
>Luck!   Roy   K6XK
>
>
>
>
>-----Original Message-----
>From: NI4L <ni4l@bellsouth.net>
>To: amps@contesting.com <amps@contesting.com>
>Date: Sunday, March 14, 1999 11:51 AM
>Subject: [AMPS] Output power 8877
>
>
>>
>>Tube 8877
>>3750 v drop back to 3450v
>>6 mills current at 65 watts
>>I seem to be getting about 1200 watts out on a two tone oscillator
>>I have a Ferrite toroid tank circuit . 10/15 meters are on a reg 
>copper
>>coil,
>>20/40/80 meters are on the toroid.
>>it seems to work pretty smooth. The question is ; Because of the 
>toroid
>>tank circuit would that make it so that it doesn't produce anymore
>>wattage than it does? the tube is good tried another one same 
>output.
>>any input on this would be greatly appreciated.
>>
>>
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>
>
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>

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