Re: tube TC (fwd)
---------- Forwarded message ----------
Date: Mon, 27 Apr 1998 06:01:45 EDT
From: Mark S Graalman <wb8jkr-at-juno-dot-com>
Subject: Re: tube TC (fwd)
In the 813 I would tie the three grids together and run it
as a triode, the grid structures are balanced well enough
so the grid current will distribute evenly and the higher
Mu as a triode will allow the coil to be run with less
feedback. John Freau has alot of experience with
tube coils, I don't know if he has used a 813 but I'm sure
he'd have some input.
On Sun, 26 Apr 1998 21:54:22 -0600 (MDT) Tesla List <tesla-at-pupman-dot-com>
>---------- Forwarded message ----------
>Date: Sun, 26 Apr 1998 12:14:20 +0200
>From: Mazzilli Vladimiro <mazvla-at-iol.it>
>Subject: tube TC
>I've a pair of 813 with graphite plate and i've built some tube tc
>with smaller tube type: 2X807 ,3X807,1XPL504, 2XPL504, 2X6KD6, 2X6DQ6B
>In all case it was a plate tuned oscillator powered by a
>transformer+ballast for plate and (because is tethrode tube) a screen
>grid xformer, with a power resistor to set the working point.
>All the tc work in half wave mode due to the less dissipated power.
>I've also used mow xformer with a variac to control the plate power.
>Is there anyone to give me suggestions for 813 use?
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