[ARC5] Crawfishing: BC-375 on 30 Meters

[David Stinson]

Sorry I mean 7984.

----- Original Message ----- 
From: "Geoff" <geoffrey at jeremy.mv.com>
To: "David Stinson" <arc5 at ix.netcom.com>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Thursday, October 31, 2013 10:15 AM
Subject: Re: [ARC5] Crawfishing: BC-375 on 30 Meters


> 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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