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 Post subject: Radiomarine AR-8506-B
PostPosted: Oct Sun 21, 2007 1:23 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2744
Location: Monterey California USA
I picked up a cosmetically challenged Radiomarine AR-8506-B receiver (as used in liberty ships) last weekend and am working on refurbishing it while the documentation is enroute.

There should be an odd lamp bulb on the chassis which shines through a clear lens on the front panel. In my situation, the lamp is missing. It's a two pin bayonet base and from photos on the web of other sets, it is a rather large globe shaped bulb similar to what an old camera flashbulb looks like.

I am guessing it may be a ballast lamp for the AC-DC filament design, or possibly a neon for oscillator B+ regulation (RCA was fond of that idea in the 1930's.)

Does anyone else have one of these receivers and/or know the number of that lamp?

Geoff
WB6NVH


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 Post subject:
PostPosted: Oct Sun 21, 2007 3:26 am 
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Joined: May Tue 30, 2006 7:28 am
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Location: Southern Ga.
Can you post an picture of this ship receiver?

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 Post subject:
PostPosted: Oct Sun 21, 2007 4:24 am 
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Location: Monterey California USA
Mine is apart but you can see photos of one in its natural habitat here, # 3 in the lower photo:

http://jproc.ca/ve3fab/jbradrm.html


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 Post subject:
PostPosted: Oct Tue 23, 2007 1:26 am 
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Location: Monterey California USA
Well, lo and behold, the latest issue of the AWA Journal was in my mailbox today, with an article about this receiver.

Seems the missing bulb should be a G-10 neon used as a voltage regulator. Also doubles as a pilot lamp...


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 Post subject:
PostPosted: Oct Tue 23, 2007 3:36 am 
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Location: Southern Ga.
Can you find the bulb and keep it original? I need a spare ballast tube 6-8B for my RBC receiver.

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 Post subject:
PostPosted: Oct Tue 23, 2007 7:30 am 
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Location: Monterey California USA
Upon further thought, I realized the AWA article is in error. G-10 is a lamp designer's bulb and base style type, not the actual lamp number. The actual lamp number is an NE-32, which is available for a price. I do want to keep it original (even though a cheap zener diode would work better.)

I don't have any 6-8B ballasts but I will keep an eye out for you. Might be worth trying a classified ad here...

Geoff


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 Post subject:
PostPosted: Oct Tue 23, 2007 4:52 pm 
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Location: California
Having operated the AR 8506-B receiver aboard the Jeremia O'Brien, I can tell you that they do perform VERY well! At least, the HF version does. And, the radio is operating on all its original parts. You can get away with that when running it on DC apparently... Of course, the drawback is unless they are burning some oil and boiling water, you can't play with the radio. I played with it while we were underway, so there was plenty of boiling water that day.

Moral of the story- When boarding any kind of ship, introduce yourself to the radio man first! I got to 'man' the radio room while the radio man was outside enjoying the deck activities. I just wasn't allowed to play with the transmitters!

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DISCLAIMER: The above post is the opinion of the poster and is not intended as a political, religious, racial or gender slur. The information included in the above post was provided free of charge and without warranty. Read at your own risk.


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 Post subject:
PostPosted: Oct Wed 24, 2007 1:42 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Monterey California USA
Also, the Maritime Radio Historical Society has a complete and functional 4U Console from one of the liberty ships in the San Francisco Maritime Museum, which they fire up once a month or so, BUT, I understand the museum is closed for renovations for an extended period... :(


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Jun Wed 20, 2012 8:25 pm 
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Joined: Jun Fri 25, 2010 7:28 am
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Location: Camino, CA
That Radiomarine 4U in the SF Maritime Museum actually came from a Victory Ship, the SS Rider Victory. I had the pleasure of seeing a number of Victory Ship radio rooms while these poor old ships were languishing out in the Suisun Bay Reserve Fleet, waiting to die. Let me know if you'd like to see some shots...be forewarned, they're graphic...lots of water got into these ships during their last 20 years of life, and most of the radio rooms were utterly destroyed. The Rider Victory's shack fared much better than most, and they pulled her Radiomarine 4U for the museum. My buddy Tom Horsfall, WA6OPE, along with Dick Dillman, W6AWO were responsible for restoring the set and getting it running at the museum, as well as doing docent duty during the weekends. They'd actually operate the gear, and have QSOs. Very informative and an excellent interpretive exhibit for the museum. Unfortunately, they didn't see it quite the same way, and from what I understand the SF Maritime Museum has mothballed the 4U and are no longer using it in their exhibits. Very sad. The vast majority of Victory ships used the Radiomarine 4U, but a few, like the SS Red Oak Victory, a museum ship in Richmond, CA, used the Federal/Mackay FT-106. Oh, by the way, I know this thread is old, but Playthings of the Past had NE-32 globe bulbs for these radios...I had to order one for mine about a year ago, and they were very reasonably priced...a fraction of the price of the ones listed on ePay.


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 2:50 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I just noticed this very old thread.
I just got a AR-8506-B this past Saturday.
I was really glad to get it back since I'm pretty sure
this is the same one I owned about 20 years ago
that I sold in a weak moment of poverty :)
The guy I sold it to sold it a few years ago in the Charlotte
conference auction and I missed it. I don't know how many
hands it went through before one of my best friends bought
it a couple months ago. He brought it out for our radio display
at the Charlotte Ham Fest this past weekend and knowing that
he doesn't hold on to anything very long I told him to put my
name on it for when he got ready to sell it.
He told me just to go ahead and take it home with me.

It's in pretty good shape, the main problem is the paint on
the table top cabinet is discolored.
I wonder what exact color it should be, it now appears to be
a lighter gray than the medium gray of the front panel with
a slight green tint to it.
Should it be the light gray like most other 50s era Navy gear?

This was a great radioing weekend.

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http://radioheaven.homestead.com/menu.html
http://antiqueradiocharlotte.homestead.com


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 3:07 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
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Ron,

It is nice your old radio found its way home again, I love happy endings :)

The 8506 is a model I have not seen before and it does look interesting.

I have been debugging a B&W 5100B transmitter for another ham and since it is now ready to leave the bench my Radiomarine 8516 receiver will be the next project. I need to do some research because as I recall the preference is to feed 110 volts DC to this AC/DC receiver. I guess it is a later descendant of your 8506.

Rodger WQ9E


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 3:29 pm 
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Location: Beaver Falls, PA. USA
My 8516 is running on 120 VAC with an isolation transformer; it just needed the selenium rectifier and cord replaced, a good cleaning of switches and controls, and alignment to be operational. I may try it on a DC supply someday, to see if that makes any difference in its operation.

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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 4:33 pm 
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Joined: Jan Fri 11, 2013 3:47 pm
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Location: Camino, California
Does anybody have theirs mounted in a cabinet? My AR-8506 and AR-8510 were pulled out of the console of a Victory Ship radio room, and are "naked".
As for color, I am pretty sure the original color would have been the lighter gray. The front panel of the AR-8506 is wrinkle-finished, too. The wrinkles are pretty fine, so it may be obscured by previous re-coats, as was mine, but believe me, it has a wrinkle-finish. My example had been painted a darker gray in service, and when I was doing the restoration on it, I scratched away some of this darker grey, and revealed the original light gray and the wrinkle. Couldn't believe it! I'll try to remember to take a picture and post this later tonight.

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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 8:06 pm 
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Location: Lehighton, PA.
Here's a link to a PDF about the Army R-203/SR version showing the shock mount.

http://jptronics.org/radios/Military/JANAP161/an.s/an.srr-type.r-203.sr.pdf

Larry

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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 8:13 pm 
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Joined: Jan Fri 11, 2013 3:47 pm
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Location: Camino, California
Not exactly what you'd call an attractive radio, is it? I had to make a wavetrap for mine, due to a local station interfering with the I.F. Decent performer, which makes up for its frumpy looks.

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Radios = more than 1 radio
Radio's = belongs to a radio


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 9:44 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I took some fotos of my 8506-B, see below.
I wish it would warm up so I could get some
light gray paint and redo the cabinet.


Attachments:
W4RON Radiomarine 01.jpg
W4RON Radiomarine 01.jpg [ 128.17 KiB | Viewed 1533 times ]
W4RON Radiomarine 02.jpg
W4RON Radiomarine 02.jpg [ 126.08 KiB | Viewed 1533 times ]
W4RON Radiomarine 03.jpg
W4RON Radiomarine 03.jpg [ 161.64 KiB | Viewed 1533 times ]
W4RON Radiomarine 04.jpg
W4RON Radiomarine 04.jpg [ 140.82 KiB | Viewed 1533 times ]

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http://radioheaven.homestead.com/menu.html
http://antiqueradiocharlotte.homestead.com
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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 10:00 pm 
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Joined: Jan Fri 11, 2013 3:47 pm
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Location: Camino, California
Ok Ron, interesting. Your cabinet looks to be the correct color for the WWII vintage sets, but I see yours is a later production, most likely made for civilian use. That kind of changes things. Yours may not have been originally wrinkle-finished. That might be its original color. Interesting indeed. How does your set function? Do you have interference issues with broadcast band stations in the I.F.? Are new filter capacitors mounted under the chassis? I installed mine in old dead tubes. Will send pics tonight after work.

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Radios = more than 1 radio
Radio's = belongs to a radio


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Mon 11, 2013 10:12 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I'm sure this one was never wrinkle paint.
It works great except it has a lot of trouble
with florescent lights.
I tried to listen to it last night in my display
room. I spent an hour turning off all the florescent
lights in the room. I think with enough antenna
it should work great.
The caps are under the chassis top, I sure would like
to find a couple caps to plug in so it looks complete.

I think when it gets warm I'll repaint the cabinet
light gray, should look good.

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73, Ron w4ron
http://radioheaven.homestead.com/menu.html
http://antiqueradiocharlotte.homestead.com


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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Tue 12, 2013 3:46 am 
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Joined: Jan Fri 11, 2013 3:47 pm
Posts: 756
Location: Camino, California
It does look really nice, Ron. On the other end of the spectrum, here's a couple shots of mine. Quite rough. Like I said, it was pulled out of a Victory Ship that had sat in the mothball fleet for 40+ years. I'm saving up to have the front powder coated in black-wrinkle, which I'll then top coat the correct shade of gray. It works quite nicely, once I installed the trap filter to


Filter capacitors under glass....mmm, delicious!
Image

Areas of the dark gray paint that has chipped away, revealing the original radiomarine gray beneath.
Image


Image

Another closeup of the grey wrinkle.
Image

More microfarads under glass.
Image

The trap filter I made to filter out the interfering stations on 1700kc.
Image

Here's what it looked like before I started chipping away the top layer of gray....
Image

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Radio = 1 radio
Radios = more than 1 radio
Radio's = belongs to a radio


Last edited by N6MKC on Mar Tue 12, 2013 4:02 am, edited 1 time in total.

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 Post subject: Re: Radiomarine AR-8506-B
PostPosted: Mar Tue 12, 2013 3:54 am 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
It doesn't have to be wrinkle, just paint it with
Rustoleum Smoke Grey or Dark Machine Grey and use white
dry transfer letters to relengend it.

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73, Ron w4ron
http://radioheaven.homestead.com/menu.html
http://antiqueradiocharlotte.homestead.com


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