[ARC5] Speaking of Tetrodes for Triodes...

[Todd, KA1KAQ]

I saw it the first time it came through a few days back, Dave.

~ Todd/KAQ

On Sat, Jul 24, 2010 at 9:45 PM,  <arc5 at ix.netcom.com> wrote:
> 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.
>
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