[HBR] "HBR-15" for sale

[Dan Merz]

Hi,  since the subject of fused plugs was brought up... An experienced radio
type pointed out to me that the double-fused plug circa 50's and 60's is
death waiting to happen.  It took me some thinking to figure out why.  The
problem is that one of the fuses in the ground leg.  If it blows for
whatever reason,  the hot side of the line is still connected to whatever is
wrong and if it's left the chassis hot then the opportunity for you to
ground the set through your body exists.  He admonished me to throw such
double-fused plugs in the garbage.  I built my 1960's 40/80 meter set with
the double-fused plug  called right out of the ARRL Handbook so there was
some nostalgia about keeping it.  I made it into a shorting jumper for one
of the light bulb sockets on my variac supply,  where it can do no harm.
Since becoming aware of this hazard,  I noted many circuits in the handbook
that used double fusing , with a fuse on each side of the line, a good idea
to protect gear but a bad idea for  personal safety without a separate,
non-fused ground to the gear.  I'm gradually putting three prong plugs with
proper grounding/ hot side fusing on most of my old sets.  For those that
don't have it,  I resort to an isolation tranformer (not a variac which
doesn't isolate).  I still like looking at the double-fused plug !  Best
regards,  Dan   

-----Original Message-----
From: hbr-bounces at mailman.qth.net [mailto:hbr-bounces at mailman.qth.net] On
Behalf Of David J Windisch
Sent: Thursday, August 11, 2005 3:25 AM
To: hbr at mailman.qth.net
Subject: [HBR] "HBR-15" for sale

Hi, all concerned:

This one was on ebay a while ago.  Bids didn't get past the reserve, and I
made an after-auction offer which was accepted.

There was no information on what is inside.

I've gotten as far as turning it on, listening on 40M, and documenting the
tube lineup.

Its general form is:

6AK5-6JH8-6JH8-6BJ6 X3-6AQ5, with l-o's, bfo, detectors, agc-amps, S-meter
circuitry.  The r-f stage has separate peaking.  The 1st-lo is tuned by a
smooooooth National PW-type drive The second i-f has provisions for 2
switched 9-pin plug-in-style mechanical filters and a "wide" position. 
 Sri -- the filters are long gone.   Power supply is internal, with a couple

of 0B2's.  Line cord has one of those fused plugs which purist-collectors 
drool over.   I don't have a pic of the bottom side; howevewr, it's nicely 
homebrewed.

Date codes on the tubes are '50s and '60s.  All but two of the shields are
those nice ones with  dissipators inside.

There are 5-pin plug-in coils for 80-10M, and extra BUD ceramic forms, in a
box.

Physically, it is H9"XW12" with tilt built in to the design, and 18" deep. 
It weighs around 30 lb.

I have the ebay jpg's, which, if I knew how to make into binaries, I could 
post on alt.binaries.pictures.radio .   They can be emailed to interested 
parties.

My original intent was to find an "HBT-XX" homebrew transmitter to go with 
it, and the intent has fallen by the wayside.   Oh, well . . .

So . . . take advantage of my indolence.  Make me an offer I can't refuse. 
Include about $40 for insured-ground shipping to conus.

73, and tks for reading.




************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and
construction notes...... via http://www.qsl.net/k5bcq/ there is also a
mirror (faster response)at http://k5bcq.edebris.com/
 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr