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 Post subject: RCA 7-transistor set in leather case: Can't find model #
PostPosted: Nov Tue 21, 2017 10:43 pm 
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Hello,
This radio has no model number on it I can see. It has a red-leather case: Not the covering that you slide a plastic radio into to protect it, but what normally is plastic is actually leather. My Bunis guide shows a model 1-BT-48, from 1958, that fits the description except it is 6 transistors. This radio does have a schematic inside, and it shows 7 transistors. I've looked around a bit but can't find anything on it. Maybe that's a negative signal as to the quality or value of this thing, but lack of info just makes me want to keep searching even more.

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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 12:00 am 
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Location: Palos Verdes, CA
The photos of the transistor radio that you have posted is not a RCA 1-BT-48 as there is a photo of this radio on page 48 of Norm Smith's book, "Transistor Radios 1954 - 1968." There is also a photofact currently for sale on eBay for the RCA 1-BT-48 that shows a photo of the radio:

https://www.ebay.com/itm/RCA-1BT41-1BT4 ... 58fd8b65a2

The 7 transistor radio in the photos does appear to be well made. I have a DeWALD Model L-546, which is similar in appearance, but it only has 4 transistors.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 2:01 am 
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Joined: Oct Mon 26, 2009 10:02 pm
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Location: Indianapolis, IN
Think I just saw that or one like it on Ebay !

Look at schematic---Japanese transistors ! And the early round IF transformers...

Very interesting---can you read the oval "badge" under the tuning knob ???

John


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 7:32 am 
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xrhonda, this is the one on ebay. I contacted the seller, and she doesn't know any more about it than I've given.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 7:47 am 
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3Trans, this is why collecting this stuff is so much fun. We don't know what we're looking at, the info is sparse, it could be a rare gem or nothing at all.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 11:32 am 
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There is a surprising resemblance to the GE 675 series; notice the position of the tuner and VC in each...
Image
Image

Also, this set uses the same round IF cans as that model GE does.

The plot thickens... :wink:

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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 1:37 pm 
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They're obviously quoting the RCA battery information... :shock:
Image

Toshiba transistors, with duck and cover.
Image

Image

Best to purchase the radio before highlighting it here.
I might just bid on it... :)

Greg.


Edit: Who'd a thunk it?

Realistic 7
Image

Image
https://www.radiomuseum.org/r/radio_sha ... tic_7.html

Maybe I'll give it a miss this time. Lol


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 4:20 pm 
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Wow, Greg, there it is, down to the sticker under the dial! Looks like another badge-engineered set that went out to multiple brands, at a very early point in transistor history, especially if that GE set from 1956 is part of it. Now I wonder just which factory it came from.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 4:35 pm 
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Fifties, it looked like you were on to something, until I saw the reversed circuit board photo at the Radiomuseum site. And only five transistors, too. Oh well.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 5:15 pm 
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In 1963 Realistic branded transistor radios were imported into the U.S. by...
A & A Trading Co. Woodside, N.Y.

1963 Directory of importers: viewtopic.php?p=2628738#p2628738

American buyers.
Japan's early export success with transistor radios was...
https://books.google.co.uk/books?id=jJA ... STOR+RADIO
▲ Assembled in Japan: Electrical Goods and the Making of the Japanese Consumer.



This (made in Japan) Realistic-8 sold by the same seller last week includes...
a reference to→ Technical Apparatus Co. Inc. Boston 17, Mass.

Image

Image
https://www.ebay.com/sch/i.html?_from=R ... 5573.m1684

Greg.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 7:22 pm 
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Good sleuthing there, Greg!

Scott, I have half a dozen of the GE 675 series, all of which I've worked on. The have only 5 Transistors as you've noticed, a copper shield over all the IF cans, and use a trick battery to supply 13.5 and 4.5 volts, so it's definitely not the same circuit. I just noticed some similarities between the two.
The GE came out in '55, and the set you've referenced most likely came out several years later. I don't recall any "pocket" size sets with more than 6 Transistors during the earliest years of their production, although that may not be an absolute fact.

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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 9:01 pm 
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Greg, that Realistic-8 in your post that sold has a Toshiba 8TM-294 board inside?

Interesting!


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Last edited by Rocco53 on Nov Wed 22, 2017 9:13 pm, edited 1 time in total.
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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Wed 22, 2017 9:03 pm 
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Thanks, Greg and Fifties, for your interest and expertise. Looks like the early years were a real free-for-all! I might just make a bid, and at the least will watch what others do and get a feel for the price range.


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Thu 23, 2017 2:42 am 
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Joined: Oct Mon 26, 2009 10:02 pm
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Location: Indianapolis, IN
Hey Greg---another trip on the same "wavelength" ! I was thinking last night that it might be an earlier Realistic set because of the leather, but didn't post since the round IF's threw me---but did notice the transistors...

Glad the mystery is solved !

Hope you get it at a reasonable price, Scott ! Let us know...

John


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Tue 28, 2017 12:59 am 
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The Ebay auction just closed, and it went for 55bucks, having started at $20. I just watched, as I still really don't know what I'm looking at. There will always be another coming along sometime, right?...Right?


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Tue 28, 2017 3:26 am 
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Wow---$55 in that condition ??? Had no idea those were so desirable !

You never know---since that one sold at that price, others might "pop out of the woodwork"...

John


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 Post subject: Re: RCA 7-transistor set in leather case: Can't find model
PostPosted: Nov Tue 28, 2017 3:54 am 
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There is an eight transistor Realistic on a buy-it-now for $20

Image
Large image: https://i.ebayimg.com/images/g/wugAAOSw ... -l1600.jpg

unfortunately it's no Prom Queen... :shock:
https://www.ebay.com/itm/VINTAGE-Realis ... Sw5bFZYo0-

Greg.

oh... notice the old-fashioned 9-volt (separate) battery snaps.
Burgess 9-volt P6
Image

Image


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