[NJARC] Hallicrafters SX-16, Hammarlund HQ-100C & More!

[joseph cro]

Hello Scott,
                  Regarding operating your BC-348 w/o headphones, all you 
need is a center tapped 6.3V filament transformer to do the job. Connect the 
two leads from the primary of the transformer to audio output of the BC-348 
via the second audio jack on front of your BC-348. Please bear in mind that 
the audio output device (speaker or headphones) sits within the plate circut 
of the receiver and therefore has B+ on it at all times! It's better to make 
your connections with the receiver in the OFF position. When that is safely 
connected, take your 4 or 8 ohm speaker and connect the center lead of the 3 
leads of the xfmr to one side of your 4 or 8 ohm speaker, and any one of the 
two existing leads to the other side of your speaker. That's all there is to 
it. At this time. turn your radio on and listen through the newly hooked up 
speaker.

You may want to try to hook up your speaker to the other lead left 
unconnected to see if your audio is better. Sometimes it is and others it is 
not.

Let me know if you need a filament transformer I can have one in the mail to 
you.

Happy Monitoring!
                            Joe Cro N3IBX





----- Original Message ----- 
From: "Scott Roberts" <ng19delta at yahoo.com>
To: "NJARC Radio Club" <njarc at mailman.qth.net>
Sent: Saturday, June 13, 2009 3:38 AM
Subject: [NJARC] Hallicrafters SX-16, Hammarlund HQ-100C & More!


> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
>
> For those who were following the recent saga of the Hallicrafters SX-16, I 
> am proud to report all seems operational, as of last week. BFO, though 
> quiet, is operating. Wish it was louder, but it is better than nothing- I 
> at least can "Zero-beat" now.
>
> The BC-348 which I also took to Info Age the other week, is quite happily 
> operational. Just have to build a proper speaker setup for it to operate 
> without headphones.
>
> The HT-37 is at the same point as when I left- the transformer is about 
> 1/2 way installed, and I have to install a few new electrolytics I got 
> from John.
>
> As a side note, I have repaired the Hammarlund HQ-100 (John D.- I was 
> looking for you at the meeting tonight! I am hoping you will be at Info 
> Age Swapmeet in July, and we can get squared up!) The problem was, as soon 
> as I hooked it up to the new antenna a few months back, the squirrelly 
> volume issue I'd been having went terminal. Not to say the antenna was the 
> cause, however. I did some deductive(inductive?) reasoning trouble 
> shooting, and determined that I was getting nice signal indications on the 
> S-mater, varying as required with different control input alterations, so 
> I decided it had to be in the output end of the house. So I went the easy 
> route, and started tracking the tubes. I pulled and tested the Audio Power 
> Output, tube V8, a 6AQ5. Testing came back DEAD... So I figured I had a 
> lead- now to find one! After digging through several badly packed boxes of 
> tubes, and finding many useless(for this job) ones, The God of Crap saw 
> fit to bless my
> endeavors(for which I thank him) with a somewhat used 6AQ5-  the only one 
> I managed to find! And it tested fine! So I installed it. I shoulda known 
> something was positive when I plugged it into its socket- I got a little 
> crackle from the speaker: and the unit was unplugged! I figure that was a 
> little capacitance discharge, although I do not know the whole circuit.
>
> Long story less so: The unit now operates with booming volume!
>
> Yay!
>
> My next few projects will be getting the HT-37 on line, finishing a 
> bastardized job of a BC-348 for the CAF, and getting the P-26 power supply 
> on line. Once those are out of the way, back to the Heathkit stuff- HR, HX 
> & HP-20 Receiver, Transmitter & Power Supply.
>
> Then, one day, I will rest...
>
> Scott
>
>
>
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