[ARC5] Crawfishing: BC-375 on 30 Meters

[Geoff]

7894 ????
Tube Lore calls it a HV regulator.

Carl


----- Original Message ----- 
From: "David Stinson" <arc5 at ix.netcom.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Thursday, October 31, 2013 6:51 AM
Subject: [ARC5] Crawfishing: BC-375 on 30 Meters


> Well, I'll have to call "hold up" on the BC-375 on 30 meters.
> After doing several other "tinkers," I've been unable to 
> replicate the success against thermal drift. 
> The drift is back on 30 and 40 meters.
> Don't yet know why.
> 
> The rig is still stable on 160 and 80.
> I'm going to focus on finding the best substitute tubes 
> for now and get back to the 30-40 drift problem later.
> 813 will not fit in the available space (socket mods not allowed).
> 811/812 will fit but requires regulating the filament voltage down.
> Will order an 8 Amp DC-DC buck module for that.
> Going to try some 7894s, which are very cheap and 
> have the right fil. rating.
> 73 DE Dave AB5S
> 
> 
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