[ARC5] BC-946

[Leslie Smith]

  Hi Mike,
  You answer prompted me to check the three surplus conversion manuals.
  I found the article you mentioned in volume #1 - but the mods
  suggested there are not in the set I have.

  Basically the BFO is removed and that stage re-wired to be used as an
  AF pre-amp.
  In my view, that's un-necessary.  By reducing the cathode resistor
  (from the 1.5k as wired) the 12A6 will supply good volume.
    
  On the point of details in the article, a 6V6 (or similar) is used in
  place of the 12A6.
  Question:  What real advantage would the 6V6 give?  The 12A6 seems
  virtually the same.
  Both are beam tetrodes; the 12A6 is a neat 'toob" - and it's metal!

  It may be that my questions are pointless.
  A fool can ask more questions in 5 minutes than a wise man can answer
  in a day.

  73 de Les Smith
  vk2bcu at operamail.com


On Tue, Apr 29, 2014, at 2:46, Mike Everette via ARC5 wrote:
> I wonder if the "conversion" referred to, might be the infamous "BC-946
> to Hi-Fi AM Tuner" that was in either Volume 1 or Volume 2 of the Surplus
> Radio Perversion Manuals.
> 
> Hmm, years ago I was fortunate to find a NEW BC-946-B in its original
> cardboard carton, with the dynamotor and a local tuning knob which must
> have been shipped with it as-new.  And so it has remained, except briefly
> when it was plugged into a rack to be checked out (worked perfectly); and
> so it shall remain.  NFS.
> 
> 73
> 
> Mike
> WA4DLF
> 
> --------------------------------------------
> On Sun, 4/27/14, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
>  Subject: Re: [ARC5] BC-946
>  To: "WA5CAB--- via ARC5" <arc5 at mailman.qth.net>
>  Cc: "Arc5 mail list" <arc5 at mailman.qth.net>
>  Date: Sunday, April 27, 2014, 7:52 PM
>  
>  On 27 Apr 2014 at 19:32,
>  WA5CAB--- via ARC5 wrote:
>  
>  > Les,
>  > 
>  > You would probably be time and certainly
>  final results ahead (if not money) 
>  > to
>  acquire a decent condition unmodified BC-453-B with
>  nameplate mounted in 
>  > the same position
>  and of the same type finish (probably clear matte 
>  > anodize).  Get it working first.  Then
>  transplant the nameplate and tuned circuits 
>  > out of the BC-946-B into the BC-453-B. 
>  If you are careful with the wires to 
>  >
>  the BFO transformer, it would look totally original.
>  
>  Les:
>  
>  Yes! I would absolutely recommend that you
>  follow Robert's suggestion. 
>  
>  As he points out, it will be far less expensive
>  and would show far better 
>  results than
>  attempting to restore the derelict you have there now.
>  
>  As has been pointed out, other
>  than the tuned circuits, the circuitry is 
>  identical between the BC-453 and the BC-946
>  
>  You would also have to
>  transplate the dial, but that is only held to the 
>  receiver by one large nut, and is easily
>  loosened.
>  
>  Ken W7EKB
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