[ARC5] Speaking of Tetrodes for Triodes...

[WA5CAB at cs.com]

It came through here several hours ago.

In a message dated 7/24/2010 8:46:05 PM Central Daylight Time, 
arc5 at ix.netcom.com writes: 
> Trying again to send this... wonder what's going on??
> 
> ----- Original Message ----- 
> From: "Henry Mei'l's" <meils at get2net.dk>
> Subject: [ARC5] Reducing BC-459A chirp: 12A6 replacement for 1626
> 
> >Screen grid voltage derives (from osc. anode voltage?) via a 20k series
> >resistor,
> >bypassed witrh a 0.001uF cap....
> 
> I have been testing inexpensive substitutes for the "audiophool" tubes
> used in SCR-183.  Triode-connected 6AQ5 or that jumped-up
> version, 58summthin-summthin, seem to be the best so far,
> and their sockets mount easily in 4-pin bases.
> I've been thinking of tapping-off B+ at the cold end of the tank circuit 
> and
> running screen voltage to them through an approriate resistor to see
> if I can get more "umph."  I'm certain it will change the neutralization,
> but I'll deal with that later.  Any comments on this?
> 73 Dave S. 

Robert & Susan Downs - Houston
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MVPA 9480