[ARC5] 10 meter BC-454 - yet more

[Geoff]

----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Monday, February 04, 2013 2:35 PM
Subject: Re: [ARC5] 10 meter BC-454 - yet more


> On 4 Feb 2013 at 14:23, tbs50a at aol.com wrote:
>
>> Hey Ken seems like your have a load of fun with old set!
>
> Well, it certainly has been "interesting". I had originally only wanted to 
> rebuild
> a BC-454 for 80 meters, and didn't intend to go this far. Unfortunately, I
> chose one out of my stack that had been hacked worse than I had first
> imagined it could have been.
>
> For any ham of the period to go to all this trouble to get a 10 meter 
> receiver
> seems like way too much work.
>
>>! I think the
>> tube # you where looking a while back to replace the 12SG7 was a 717A.
>> Keep us posted as to it performance, think it should be a hot
>> performer. GL Terry N3GTE
>
> Actually, re-reading an article I have here by Gordon White, he mentioned
> the 6AB7, which is a slightly different version of the 6AC7....but the 
> receiver
> he was using this with had its filament string re-wired to all parallel.

6AC7 is sharp cutoff.

>
> Mine is still set up for 24 V filaments, so I have to use a 12 volt tube.
>
> I think the 717A is a 6.3 volt tube, but will have to check on that.

Correct, there was no 12V equivalent nor was there a 12AK5. The 717A was a 
6AK5 on its side as an interim tube to satisfy existing contracts while WE 
was readying the 6AK5 for new contracts.

Carl



>
> The easiest upgrade to the RF and IF amps is the 12SG7. I have a few of
> those and may try them after I get all the present issues sorted out.
>
> Thanks, Terry.
>
> Ken W7EKB
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