[ARC5] Vintage LF/MF Fun with my BC-453B

[Dennis Monticelli]

Works fine.  Audio output is down.  Gain is down.  However, what matters,
the S/N, seems about the same.

Dennis AE6C

On Fri, Nov 21, 2025 at 12:15 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:

> HI Dennis --
>
> I've found that under 180V plate produces a notable drop in performance.
>  I was surprised that 72 V B+ even worked!
>
> Mark K3MSB
>
> On Wed, Nov 19, 2025 at 4:15 PM Dennis Monticelli <
> dennis.monticelli at gmail.com> wrote:
>
>> Mark,
>>
>> That is a fun thing to do.  10 yrs ago I did the same thing with a
>> rebuilt BC-453B.  One tip I will pass along is to use batteries if you can,
>> especially the B+.  I ran eight 9V batteries for B+.   Divorcing the
>> receiver from the AC line reduces noise pickup from all the crud that
>> modern electronics dump into the line.  It was a significant difference in
>> my situation.  Also if you haven't already, adjust the IF transformers for
>> looser coupling by pulling up on the tabs.  This will reduce the noise BW.
>>
>> Dennis AE6C
>>
>> On Wed, Nov 19, 2025 at 12:25 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:
>>
>>> Hi Everyone
>>>
>>> For the past 2 years I've been using my RBA receiver for vintage LF/MF
>>> fun, and have logged over 200 NDBs each year.   This year I decided to use
>>> my BC-453B receiver.   It's been recapped, and all out of tolerance
>>> resistors (sans one....) have been replaced.
>>>
>>> [image: image.png]
>>>
>>> Since early November,  I've logged 52 NDBs.   I'm hoping to log 100 this
>>> listening season (which runs through March).
>>>
>>> 73 Mark K3MSB
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>>
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