[Milsurplus] BC-348-Q restoration

[Mark K3MSB]

Hi Dennis

Check the audio plate bypass cap (24-2) so you dont take out the audio
transformer primary if it's bad.

Check both filament dropping resistors (85, 85).  Mine were way off.

73 Mark K3MSB

On Mon, Jun 15, 2020, 11:01 AM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> Hi guys,
>
> I am beginning my first BC-348 restoration. Luckily the Q model is the
> simpler of the two basic types. It appears to have decent caps, not
> micamol. Not badly hacked either.
>
> First order of business has been to remove unwanted mods. That means all
> other than the AC supply, which fortunately was well executed.  A 1uF
> bypass cap on the cathode of the 2nd IF has been added.  The stock 0.1uF
> bypass is still there.  Was this a published mod to change AVC action?
>
> Regarding the tuning gearing.  It was stiff and I found dried grease.  Was
> any grease used on stock units?  I note the use of brass on steel gear
> design choices which I recall is naturally lubricating.  What do you
> recommend regarding cleaning and possible lube of the gears?  I am using
> WD-40 on Q-tips to clean off the old lube.
>
> Any other restoration hints would be appreciated.
>
> Dennis AE6C
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