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BP-10 Personal

BP-10 Personal; RCA RCA Victor Co. (ID = 1050749) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 1050750) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 1050754) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 583109) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 583110) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 153549) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 153585) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 153586) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 153587) Radio
 
BP-10 Personal; RCA RCA Victor Co. (ID = 153588) Radio
BP-10 Personal; RCA RCA Victor Co. (ID = 47373) Radio BP-10 Personal; RCA RCA Victor Co. (ID = 57322) Radio
BP-10 Personal; RCA RCA Victor Co. (ID = 243816) Radio BP-10 Personal; RCA RCA Victor Co. (ID = 243811) Radio
BP-10 Personal; RCA RCA Victor Co. (ID = 243813) Radio BP-10 Personal; RCA RCA Victor Co. (ID = 243815) Radio
BP-10 Personal; RCA RCA Victor Co. (ID = 279546) Radio BP-10 Personal; RCA RCA Victor Co. (ID = 279547) Radio
BP-10 Personal; RCA RCA Victor Co. (ID = 279548) Radio BP-10 Personal; RCA RCA Victor Co. (ID = 447066) Radio
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BP-10 Personal; RCA RCA Victor Co. (ID = 47373) Radio
RCA RCA Victor Co.: BP-10 Personal [Radio] ID = 47373 400x309
Select picture or schematic to display from thumbnails on the right and click for download.
For model BP-10 Personal, RCA (RCA Victor Co. Inc.); New York (NY)
 
Country:  United States of America (USA)
Manufacturer / Brand:  RCA (RCA Victor Co. Inc.); New York (NY)
alternative name
 
RCA Manufacturing || Victor Talking Machine
Year: 1940/1941 Type: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: 1R5 1T4 1S5 1S4
Principle Super-Heterodyne (Super in general); ZF/IF 455 kHz
Wave bands Broadcast only (MW).
Details
Power type and voltage Dry Batteries / 67,5+1,5 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3 inch = 7.6 cm
Power out 0.12 W (unknown quality)
from Radiomuseum.org Model: BP-10 Personal - RCA RCA Victor Co. Inc.; New
Material Leather / canvas / plastic - over other material
Shape Very small Portable or Pocket-Set (Handheld) < 8 inch.
Dimensions (WHD) 230 x 80 x 93 mm / 9.1 x 3.1 x 3.7 inch
Notes First flip top lid (coat pocket size) model. On-off by lid action. Battery #467. Together with Sonora Candid the first models using miniature (7 pin) tubes.
Net weight (2.2 lb = 1 kg) 4.25 lb (4 lb 4 oz) / 1.930 kg
Collectors' prices  
External source of data Ernst Erb
Source of data The Radio CollectorGrinder, 1995
Circuit diagram reference Rider's Perpetual, Volume 12 = ca. 1941 and before
Mentioned in Collector's Guide to AR4.Ed.,Bunis, tube
Literature/Schematics (1) The Portable Radio in American Life, M.B. Schiffer
Literature/Schematics (2) Radio Retailing (R & Television R.) (July 1941.)
Literature/Schematics (3) RCA Victor Service Notes "Red Book" Series


All listed radios etc. from RCA (RCA Victor Co. Inc.); New York (NY)
Here you find 4315 models, 2399 with images and 3530 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
RCA RCA Victor Co.: BP-10 Personal
Threads: 4 | Posts: 23
Hits: 9103     Replies: 9
rca: BP-10 article
Tom Warnagiris
03.Aug.11
  1

I've written an article regarding the history of the RCA BP-10 radio.  I have it available in both .PDF and Microsodt Word form.  It's about 1.5 Meg in size.  What's the most convenient method of forwarding in to the model administrator for review and eventual posting?  

Thanks,

Joe Sousa
06.Aug.11
  2

Hello Tom:

I look forward to your article. 

These instructions about mulipage pdf uploading may be of help.

Regards,

-Joe

Michael Watterson
16.Oct.11
  3

Did this article ever get uploaded?  I don't see it here: List of PDFs

RCA BP10: Earliest Compact Portable?

I think the BP10 was one of first B7G based Miniature valve radio sets. So compact for 1941 compared to the "boxes" in UK of 1950s. Though was the Marconi or Marconiphone P17b (1947) a design  via HMV / RCA connection? It's a very similar outer shape though different chassis layout and single B114 combo 67V/1.5V battery pack (later called a 70V/1.5V). One version has used MOV X17 W17 ZD17 N17 and other DK91, DF91, DAF91 and DL91 (both essentially the RCA 1940 1R5 1T4 1S5 1S4 series used in the BP10). Marconi appears to have made the Ever Ready Personal B, or perhaps supplied the chassis with DK91, DF91, DAF91 and DL91 and box fitted by Ever Ready as the internal front panel is different. The 3S4 is a centre tapped 1S4, thus the later European equivalent is the DL92.

There may be no connection at all apart from similar "form factor" and  tube line up between the 1941 RCA BP10 and 1947  Marconi/Ever Ready P17B/Personal B. As LW was important in UK and not in US, the Ever Ready B2 in 1948 used higher inductance oscillator coil and frame aerial for LW and the "wave band" switch for MW simply adds two parallel inductors on the aerial coil and oscillator coil to give approximately the B model MW tuning range.

Similar form factor 1941 radios with the RCA 1R5 1T4 1S5 1S4 design were the Crosley Commuter and Emerson mini portable.

"Communications for April 1941"

The Personal Radio Receiver

This is a six page article discussing with drawings or photos with schematics of:

GE LS-412

GE (a 2nd similar set pictured)

RCA BP10

Zenith 4K600

Philco

Emerson FF series (FF411 includes "economiser" switch). The Emerson mini-portable is illustrated (are these the same or different models? The text does discuss Emerson "models" differences )

Farnsworth CT59

Farnsworth KD57

Fada mentioned?

Admiral (Continental) 29-G5

Crosley Commuter

Garod BP20

Motorola A1

Dewald 564

Dewald 410

Air Castle (45V)

Case Materials used listed: Wood, Plastic, Bakelite, Polystyrene, Aluminium, Tenite, Acetate, "metal", "cloth"

Most of the mains / battery sets use filaments parallel on battery and series on mains (7.5V). The Motorola series on Battery. The 7.5V versions (mains or battery) need to use the 3S4 (later in 1947 the DL92) centre tapped version of IS4

Some models in the text or schematics are not those illustrated.

10 photos/illustrations of radios, 10 schematics. All 1941!

 

Did the WWII kill these off or was performance and battery life too poor in such small packages?

Then during WWII we had the Miniature Receiver Type 31/1 (from 1943) aka "Sweetheart three tube IT4 regenerative radio designed by a Norwegian in UK, dropped behind German lines. It used 2 x 15V hearing aid batteries like the B121 in AVO meter and a 4.5V "flat" torch battery (still only just available for cycle lamps. Short and long "brass" strips on top) and the miniature 1943 Polish designed (in UK) Miniature Receiver OP-3 Type 30/1 a dual band superhet presumably using the RCA 1R5 1T4 1S5 1S4 design (battery arrangement unknown to me).

After WWII RCA an attractive Aluminium style model RCA 8BX6 globetrotter and the  1954 RCA Victor 6BX6A.  The 1951 Braun Piccolo is slightly  similar style to the 8BX6. Many attractive German and Philips portable tube sets, often with LW, MW, SW and later many with VHF too. Yet most UK models for entire 1950s are large Rexine (leatherette cloth) covered wooden boxes. Even after the 1/2 LT current DK96, DF96, DAF96 and DL96 introduced. Ever Ready, Vidor, Pye/PAM/Invicta, Marconi, Ferranti, Bush etc.

Personal Radio Receiver 1

Click each part of page separately for full size (jpg for "photos" to fit < 200k)

 

 

(click on above for full size)

 

Konrad Birkner † 12.08.2014
18.Oct.11
  4

Just a humble addition to the amazing article above:

According to M.B.Schiffer "The Portable Radio in American Life" The first radios which made use of the new "miniature" tubes are the RCA BP-10 and the Sonora Candid (so called "camera style", slightly bigger than the "coat pocket radios")

In Germany only one "coat pocket" model of the flip top style was produced: the 1950 Metz "Baby".

 

Michael Watterson
18.Oct.11
  5

Thanks for the confirmation on the RCA BP10. There is also model above there (labelled "E" a Philco) deliberately designed to look just like camera (with the two knobs on top).

However while they are small, few of the radios in the article would win a beauty contest. Germany and (Philips Colette 1956, Annette etc)  made many beautiful styled portables in the 1950s where "koffer" (suitcase) is unfair. The UK mostly made small "suitcase" (briefcase, hat box, valise, "jewel box" and attaché case) wooden boxes with Rexine in the period.  Example Braun Piccolo 1951 Also models from Akkord, Grundig and others. I'm no expert on German 1950s portables though.

As mentioned earlier there are only a very few  well styled very portable UK models (the Marconi/Ever Ready mentioned earlier is the only "pocket" model.  The "Romac Portable" of 1946 is an exception (I see you remark it is even the first UK model apart from Wartime Covert Radio with B7G valves in UK). The Romac is very like the Philco "camera" styled model "E" above. What happened to case design in UK? The perspex Pye "sunrise" portable was recalled (because the case broke easily or because of "rising sun" motif?). One theory is that the British Public wanted "Wooden boxes" and was not concerned with a more miniature design. Wood for cases in late 1950s and early 1950s was in short supply which is why many Bakelite table models produced, even Bakelite TV sets as in the late 1940s the Makers did not even reach production quota allowed by Government in UK due to shortage of wood for cabinets!

 

Not featured in the Communications April 1941 Article:

Candid
KG-80
(1940)
1R5 1T4 1S5 1S4
Marconiphone
P17B (1947)
X17 W17 ZD17 N17
 

Marconiphone
P17B (1948)
DK91 DF91 DAF91 DL92

Ever Ready
Personal B
(1947)
(Marconi P17B)
DK91 DF91 DAF91 DL92
Ever Ready B2
(adds LW)
(1950?)
DK91 DF91 DAF91 DL92
Metz Baby4
(1950)
DK91 DF91 DAF91 DL92

 

 

Tom Warnagiris
18.Nov.11
  6

I apologize for the delay in getting back to you.  I’ve recently learned that the article that I was intending to send to you will be available on the Internet next year.  Antique Radio Classified (ACR) published it in their February 2011 issue.  I had planned to revise the article for you so as not to conflict with what was published by ACR.  But, since it will be online as part of ACRs 2011 archived articles, I will not ask that the Radio Museum host it.

Michael Watterson
29.Oct.12
  7

The Roberts R77 is 1957, maybe a little larger, strange as there were transistor "personal sets" by 1957.

4: DK96 DF96 DAF96 DL96 So total 125mA LT rather than 250mA

MW and LW

 

The Vidor CN353 is 1947 so contemporary with the Marconiphone/Ever Ready Personal (both probably made by Plessey).

4: DK91 DF91 DAF91 DL92 (1R5, 1T4, 1S5, 3S4) 250mA LT

Very similar to BP10 concept, but MW & LW

 

The Championette from 1949

4: 1R5 1T4 1S5 3S4

Again similar to the RCA BP10 Personal concept. 67V HT

250mA 1.5V LT, MW only

 

Marconiphone P20BX and also K12 P20B 1948

Again HT is 67.5 or 69V to reduce HT size

4: X17 W17 ZD17 N17 (1R5, 1T4, 1S5, 3S4)

A bit fatter than the earlier P17B / Ever Ready B but LW & MW

 

Stromberg-Carlson 4P17 from 1947 in Australia

4: 1R5 1T4 1S5 3S4

Same reciepe, MW only of course

 

It's puzzling that the "Personal" set didn't have a reappearance with 25mA Dx96 series and ferritte rod from 1953 to 1956/1958  (First Transistor sets 1955, common by 1958) without the awkward flip lid aerial. The cheap supermarket DAB sets have only 4hours to 5 hours battery life compared to 25 to 60 hours possible with a "Personal" tube radio!

 

 

Michael Watterson
04.Nov.12
  8
 

 

 
This isn't a comprehensive list. Some are listed as >8 " portables and some as smaller portables.
 
All are 1T4, 1R5, 1S5, but may vary in output tube. Some manage to fit in a mains supply too. 67V and 1.5V D cell (or two in parallel!) is common rather than 90V HT to reduce battery size.
 

Candid 1940
KG-80

 

 

 

RCA 1940

BP-10 Personal

 
 
 

Westinghouse 1940

WR-682A

(yes, identical to BP10)
 

Allied-radio Corp 1940?  

Knight B-10506

45V HT

 

Lafayette 1940  

 

Lafayette 1940 ?
 
 
 
 
 
 

 Admiral 1941 ?

28-G5  

67V HT and 110V AC mains

 

Dewald 1941

564

 
 

 

Montgomery 1941

14WG-438

 
 
 
 

Zenith Radio 1941

"Poketradio" 4K600P

"Poketradio" 4K600R

"Poketradio" 4K600W

 

Zenith Radio 1941

"Poketradio" 4K600 Ch=4B01

 
 
 

Detrola 1941

378

 
 
 
 

Emerson 1941

432 Power-Mite

 

 

 

General Motors Radio  1941  

Pocket Portable 985775

 
 
 

Admiral Radio 1941  

Bantam 29-G5 

 
 
 

Admiral 1941  

29 Ch = G5

 
 

Admiral 1941  

27-G4

 
 

 

Emerson 1941

379 Personal Radio Ch= DU

 

 

Emerson  1941

380 Personal Radio Ch= DU

 

 

Farnsworth 1941
 
 

 

Firestone 1941

S7397-1 Air Chief Ch= E442


 

 

 

Fada 1941?  

Series 33 L33

 
 
 
 

Fada 1941

C34

 

 

 

USA motorola
Radio 1941 S $ 

3A5

 

 

 

Sentinel 1941
 
 
 
 
 
 

General Electric 1942

LB-502

(also a 1941 model LB-642, but no clear photo)
 
 

Crosley 1942?

45 Commuter Ch= 45

 

 

Lafayette 1942  


 

 

 

RCA 1946  (many versions)

54B1

54B2

54B3

 

Emerson 1946

508

 

 

RCA  1947

54B5 "The Solitaire"

 

 

Airking 1948  

494

 
 

Airking 1948

A-410

 
 
 
 

Automatic Radio Co.  1948/49

B44 Tom-Thumb Bike Radio

67V HT

 

Automatic Radio Co. 1948

TomThumb Camera

 

 

Automatic Radio Co.  1949

TomThumb Buddy

Konrad Birkner † 12.08.2014
04.Nov.12
  9

here is another one:

 Signal 141   1947/48

Michael Watterson
08.Jan.13
  10

Braun Exporter 2 1956 to 1959

Only 175 x 120 x 50 mm @ 0.9kg
Using only 50V HT to save space.

There is also the Braun Exporter (listed as 1.1kg, but same size)

 
Hits: 986     Replies: 2
rca: Personal; BP10: How to remove chassis?:
Michele Denber
06.Mar.09
  1

Hello again dear Radio Collectors.  I managed to get a new B battery for my BP-10 from Antique Electronics Supply.  Now I need to know how to remove the chassis from the case.  It's not at all obvious how this must come out.  If anyone can give me a hint, I would most appreciate it.  Thanks / danke sehr!

Bill Morris
07.Mar.09
  2

Okay, I'm going by memory on this, so pls bear with me:

First thing that needs to be removed is the main body of the receiver.  There are three screws to remove--one near the tuning cap, one by the volume control and the last near the speaker and A battery holder.  You may have to undo the A battery holder to reach this last screw.  Once those are undone, the middle jacket can be lifted off. 

The antenna straps will need to be unsoldered from their leads.  You can then remove the four nuts that fasten the chassis to the chrome fascia panel.  Lift the chassis up from the speaker side, slide it enough away so that the thumbweels clear the panel and lift away.

Michele Denber
07.Mar.09
  3

Hi Bill, thanks for the information.  You were exactly correct.  All I needed to do was remove the three screws and the case sleeve came right off.  I cleaned off the corrosion caused long ago by leaky batteries (the old B battery had a 1948 date stamp on it!)  I cleaned the tube pins and the glass envelopes.  All four tubes appear to be original RCA's.  Note to anyone else with these - the ink on the tubes is very fragile and will come off even with gentle rubbing.  I only cleaned the parts without writing.

Then just for the heck of it, I connected new batteries and turned it on.  And it worked!  It sounds great, even with almost 70 year old paper capacitors still in it.

 
Hits: 3550     Replies: 8
rca: Personal; RCA BP10: A and B batteries?
Michele Denber
27.Feb.09
  1

Hello dear Collectors.  I just got an RCA BP-10.  This radio uses one A and one B battery.  I suppose I can substitue a C or D cell for the A battery, but the B battery has me stumped.  The B battery is 67.5 V.  I've checked the web and Ebay and found nothing.  At worst I could empty out the guts of the dead battery and replace it with something new - but what?  Has anyone done this before?  What did you use?  Thanks.

Und auf Deutsch: Ich suche ein B batterie fur ein RCA BP-10 aber kann das nicht finden.  Wissen jemand wo man das kaufen konnen?  Oder ist es basteln etwas moeglich?  Danke sehr.

Bernhard Nagel
27.Feb.09
  2

Dear Michele,

there are two ways in replacing the no longer produced high voltage batteries for (portable) tube radios like your RCA BP10. The easiest way is: empty out the dead battery and refill it with the correct number of 9 Volts batteries (MN1604). These are connected simply in series, for 67.5 volts you need 7-8 batteries. Since radios such as the RCA BP10 has no more than 10-12 mA total power consumption, it can thus operate 20-40 hours. But you should be aware with the new high voltage battery B! You can easily submit some amperes of current if it is accidentally shorted. A fuse of 100 mA should be inserted between the battery and radio to avoid a fire hazard or explosion.

The second option is a voltage converter to use. It runs with 2 C cells and generates 67.5 or 75 Volts. These replacement batteries are also sometimes offered on ebay, item number 360133485153 shows some nice examples, it comes from Austria. Also, the self-build of a voltage converter is possible, there are some interesting articles in the RMorg forum regarding this, unfortunately only in German language. Using the terms Anodenbatterie Ersatz in SEARCH shows some hits, like this and that.

Hope, this will help a little!

Bernhard

Roy Johnson
27.Feb.09
  3

Hello Michele,

Most folks use the 9v PP9 style batteries connected in series. 

My preference is for the circular Lithium cells that last even longer with a shelf life of perhaps 10+ years. I put these in a plastic tube such as that used for drainage.  It is sufficient to add plastic foam pieces at the end and tape over to maintain contacts between the cells and wires for the connections.   Like a voltaic pile!

Happy building!

Regards,

Roy

Thomas Albrecht
27.Feb.09
  4

Hi Michele,

You have a few different options here:

1.  Replace the 67.5 volt B battery with eight 9-volt batteries in series.  This is commonly done today and is the easiest option.  Don't worry about the voltage being a little higher than 67.5 volts; it will work fine.

2.  Fancier version of the above:  Build the eight 9 volt batteries into the shell of an old 67.5 volt battery.  Takes a bit of mechanical innovation, but you will likely figure out a way to do that.  If you don't have an old battery available, with an internet search you will likely find a scan of the cardboard shell of an old B battery (for example, Eveready type 467) that you can print out and wrap around a new battery pack you make in a cardboad or wooden enclosure of the right physical size.  You might also find that you can fit sixteen 9 volt batteries inside, with series-parallel wiring, which will give you twice the battery life.

3.  Build an AC-powered external power supply to serve as a battery eliminator.  I've done some designs for power supplies to work with typical battery tube radios and can post if desired.

Best regards,

Tom

Bill Morris
28.Feb.09
  5

Michelle, feel free to contact me at batterymaker at gmail dot com.  I'm reworking a solution for the battery you need--it's called a 467.

 

Bill

 

Michele Denber
28.Feb.09
  6

Wow, thank you so much to everyone for the prompt replies.  Fortunately, the radio came with a B battery in it, although it is obviously long since dead.  Fortunately, it did not leak and the carton looks great.  (It is a Burgess battery).  I certainly thought of emptying this battery and putting 9 V. batteries in series inside, but I didn't know if there might be some reason why that would not work.

Thanks to Bernhard for suggesting using a DC-DC converter.  I like that idea and had not thought of it.  Thanks to Roy for suggesting lithium cells.  That's a great idea since I don't really plan to be running this radio often once I restore it.  Thanks also to Thomas for suggesting a series-parallel arrangement.  If they'll fit, I might just do that.  And thanks to Bill for the contact.  It looks like I now have a plan to proceed.

Konrad Birkner † 12.08.2014
28.Feb.09
  7

a #467 battery  is correct. Available from Antique Electronic Supply (AES) in Tempe,  AZ.

see tubesandmore.com.

Good luck
KoBi

Michele Denber
28.Feb.09
  8

Yes, when you add up the cost of individual 9 v. cells and the time and effort involved, I might as well just buy one from AES.  I have dealt with them often and can highly recommend them.  They have lots of tubes and capacitors we need all the time, and their shipping is super fast.  I don't know why I didn't think of that.  Thanks!

Michael Watterson
16.Oct.11
  9

The lithium CR2032 coin cells are not great above 1mA or 2mA discharge current so for a 90V pack I used 6 x stacks in parallel via 6 x 1N4148 diodes in cardboard tubes. Total  about 1200 mAH compared to 180mAH for a stack of Alkaline PP3 9V cells.

Since voltage is 3.2V down to 2.75V you don't need as many as you think (Carbon Zinc is 1.6V down to 0.9V per cell).

So though "90V" might suggest 30 coins per stack and 67V  a stack of 22 coins, actually 25 is fine for a 90V set (though I used 26 x 6 coins). no more than 30

67V set 18 per stack/tube will work, no more than 22

For a 48V set 13 or 14  coins per stack is fine, no more than 16.

The 48V, 67 and 90V are very much nominal voltages and even if we take 1.1V rather than the industry spec of today of 0.9V for exhusted cell

90V -> 66V (60x Zinc Carbon cells)

67 -> 49.5V (45x Zinc Carbon cells)

48 -> 35.2 (32x Zinc Carbon cells).

I bought CR2032 at SEVEN Euro cents each including postage from Hong Kong.

(20mm diameter, 3.2mm thick, 200mAH to 270mAH depending on maker/quality)

 

 
Hits: 1166     Replies: 0
rca: ; BP10
Konrad Birkner † 12.08.2014
07.Mar.04
  1 Superhet; Mittelwelle; Maße: 230 / 80 / 95 ; 4 Röhren: 1R5 / 1T4 / 1S5 / 1S4 ; eines der beiden ersten Geräte mit Miniaturröhren (das andere ist Sonora Candid); das erste Gerät im Querformat das durch Öffnen des Deckels einschaltet. Rahmenantenne im Deckel;
 
RCA RCA Victor Co.: BP-10 Personal
End of forum contributions about this model

  
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