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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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21st Jun 2017, 4:15 pm | #1 |
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Another Sweetheart?
One of my colleagues Steve at work (knowing my interest) brought in this rather lovely set
Outwardly the case is similar in shape to the 31/1 inside however it looks a little bit more complicated. I don't have my Wireless for the Warrior to hand (Vol 4) so I thought I would ask for some help here. Some small modifications have been made so I would like to be able to identify original and mod as well. Cheers Mike T
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21st Jun 2017, 4:17 pm | #2 |
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Re: Another Sweetheart?
The set is 4 valves and here are some pictures of the battery box.
I didn't close the battery box completely as its a real tight fit and I didn't want to cause any damage. Cheers Mike T
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21st Jun 2017, 4:24 pm | #3 |
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Re: Another Sweetheart?
It's Polish OP 3 (Type 30/1).
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21st Jun 2017, 4:32 pm | #4 |
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Re: Another Sweetheart?
Thanks Graham
Cheers Mike T
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21st Jun 2017, 4:57 pm | #5 |
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Re: Another Sweetheart?
http://www.radiomuseum.org/r/mil_gb_op_3_type_301.html
I've only ever seen one of these (when I took the photos on RM) but I'd dearly like to possess one! They're a joy to behold, inside. The nearest I can manage at the moment is a Marconi P17B which squeezes the electronics into a similar space but is only MW coverage.
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21st Jun 2017, 6:56 pm | #6 |
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Re: Another Sweetheart?
Hi Herald I am with you on this its a real solid lump in your hands and it's hard to believe its from 1943.
I have made sure its owner is aware of its monetary and historic value. To be fair I think he was already aware its a special item. I always appreciate it when people show me these things. I hope he keeps it for his family so generations to come will enjoy it. He's a fellow engineer and his Father had it working not too long ago so I feel it will shortly be receiving once again. Cheers Mike T
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21st Jun 2017, 7:03 pm | #7 |
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Re: Another Sweetheart?
That's interesting looking at the pictures in Heralds link the battery box is quite different.
The holes for a speaker look at least in part to have been drilled "freehand" But the design suggests a speaker was designed to be fitted? The batteries have been reloacated to leave space. Very interesting Cheers Mike T
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21st Jun 2017, 7:08 pm | #8 |
Hexode
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Re: Another Sweetheart?
There were 2 versions one had the speaker in the battery box and the other was for phones only. I believe that the speaker version was known as OP-3G.
I have started building a copy of Sweetheart type 31-1 but one day may get around to building a copy of OP-3 (type 30-1). Dave GW7ONS |
21st Jun 2017, 7:11 pm | #9 |
Hexode
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Re: Another Sweetheart?
Just checked this site: http://www.cryptomuseum.com/spy/op3/ and discovered that there are 3 versions, I am not sure what the differences are between OP-3 and OP-3A.
Dave GW7ONS |
21st Jun 2017, 7:13 pm | #10 |
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Re: Another Sweetheart?
Having seen a real OP3 thats quite a task.
Really like to see the results. As Gerry always used to say though, It was built by people so I can recreate it and you know what he always did. Are there any pictures of the OP-3G ? Cheers Mike T
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21st Jun 2017, 7:17 pm | #11 |
Hexode
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Re: Another Sweetheart?
There are pictures here:
http://www.wftw.nl/24%20OP3-G%20v1%2000.pdf and a schematic here: https://www.vintage-radio.net/forum/...d.php?t=130210 I don't think I will be able to replicate the OP-3 particularly accurately and it is a project for the future. Dave GW7ONS |
21st Jun 2017, 7:22 pm | #12 |
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Re: Another Sweetheart?
Thanks Dave
I will show this to Steve tomorrow. Cheers Mike T
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