[Boatanchors] Embarrassing Rookie Question

[Rob Atkinson]

I am not sure what your goal is, but if it is to have nice booming
audio from that p.p. output stage, then it is hard to beat an old bass
reflex wood cabinet with a 12 inch full range speaker.  You can find
old speakers such as that at hamfests.  Look for Jensen, CTS (the made
them for a number of manufacturers such as Zenith) RCA or GE.  The
"bass" speakers in old stereo consoles were these with a simple cross
over network that sent the high frequencies on to other elements.
But, with nothing on them but the secondary of an output transformer
they work fine up to 12 kc and are perfect for ham and SWL radio use.
They can be had at hamfests for $3 each.  Bring an ohm meter to test
the coil resistance.  With a good coil and visible cone inspection you
are good to buy.
A speaker like that in an old Electrovoice Aristocrat cabinet with a
baffle port opened will sound fantastic compared to the matching metal
box speaker most manufacturers sold.  Then you can leave the
transformer in the NC200 cabinet.   You can find cabinets at hamfests
or on craigslist.   A liittle work with murphy oil soap and Old
English polish and you'll have that distressed old buzzard look that
goes great with a vintage set (in my opinion).

73

Rob
K5UJ


>
> I just picked up a beat-up NC-200 today as my latest project. I don't have the speaker, so is it OK if I work on this radio with headphones, no speaker, and the 6V6s removed?
> Once I get this set working well, I plan to fabricate a new speaker by taking a traditional speaker in a metal box, installing a push-pull output transformer in the box, and making a cable ending in a five-prong plug. I recently did that with a Patterson PR-12 and it worked out very nicely. I doubt that I'll get lucky enough to find the proper National speaker at any hamfests this year.
> As always, thank you for your help.
>