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History of the manufacturer  

Unitra DIORA - Radiowerk Dzierzoniow,

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Name: Unitra DIORA - Radiowerk Dzierzoniow,    (PL)  
Abbreviation: unitradior

Radiowerk Dzierzoniow, ul. Swidnicka 38 (former Reichenbach, Silesia), Poland. Only later this establishment received the name DIORA. See remark.

After WW2 improved "Philettas" (former Philips model produced there until 1945) were manufactured. The refinement embraced larger speakers and enlarged bakelite cases as well as reduced mains hum and later even wooden cabinets.

These Philetta successors were named "PIONIER"(mainly with U..21 loctal tubes for AC/DC) and "MAZUR"(E type tubes for AC).

Licensing agreements from AGA (Sweden) made use of AGA components possible (e.g.IF filters) for these models, and complete production of other (AGA) models as well.

Pionier and Mazur are considered the most popular radios of polish production and they used to be in high repute for their performance, being superior to their predecessors.

There might have been even another name, but after WW2 in Poland all the factories had been more or less anonymous, only identified by a code number.

Some models:
Country Year Name 1st Tube Notes
PL  51–53 Mazur-L ECH21  Typical adaption from former Philips Philetta. 
PL  48–59 Pionier U2 [bakelite] UCH21  There can be found 3 different cabinets for the Diora Pionier U2. For the "Pionier", the p... 
PL  73 Ślęża DMT-312 25612   getrennte Abstimmung für AM und FM. BC211 or 313 
PL  47 Pionier U T9 UCH21   
PL  50–58 Pionier B 1R5T  Prototyp - radio AGA, Sweden. 
PL  48 Pionier U2 [wood "old"] UCH21  There can be found 3 different cabinets for the Diora Pionier U2. For the "Pionier", the p... 
PL  61 Menuet 6204 [EM80] ECH21  Siehe auch Variante Menuet 6204 mit EM84. Phono-Chassis: Diora T4. 
PL  64 Menuet 6204 [EM84] ECH21   
PL  75 Amor [FM: CCIR] BF195  Winkelskala. Siehe auch Unitra Amor DMT-407 mit UKW-Bereich nach OIRT 66 - 73,5 MHz. 
PL  56–58 Mazur II (2) 6262 ECH21   
PL  86 HR-402   Exportmodell. 
PL  72 Lira DMT-453    


Further details for this manufacturer by the members (rmfiorg):

Logo in Lena 2 front.tbn_pl_unitradior_lena2_front_logo.jpg

Forum contributions about this manufacturer/brand
Unitra DIORA - Radiowerk Dzierzoniow,
Threads: 1 | Posts: 4
Hits: 7225     Replies: 3
Pionier ZPR - Czecoslovakia 1955
Oriol Sierra

I've recently purchased an old radio in Poland, manufactured by Z.P.R. PIONIER
in Czecoslowakia in 1955 (mod. Pionier-Czecoslovakia 1955). The photo is below.

I am currently restoring it and I am looking for information about the
history of this company (that I think was a subsidiary of Philips) and
if possible, technical information about this model. Could you maybe
help me to find out where can I find this information?


Dirk Becker
  2 I found some information by googling "Pioner U2". U2 is afaik the type name of the set. I repaired one some years ago for a friend of mine. Attached to this answer you find some alignment information which I wrote down, when I was repairing the radio. Perhaps it's a bit helpful for you, even it's in german.


P.S.: some links (the second link contains a schematic):


Henryk Fidos

Presented radio "Pionier" has been produced in Poland in Z.P.R. - Zaklady Przemyslu Radiowego (it means - Factory of Radio Industry) - later "Diora", in Dzierzoniow (Silesia). Not in Czechoslovakia. There were different models of above radio in different housings - wooden or bakelite. I have six different in my collection.The model in the same housing with power transformer was called "Mazur". 

- Henryk

Eilert Menke


please take a look here:

Regards, E.M.

Unitra DIORA - Radiowerk Dzierzoniow,
End of forum contributions about this manufacturer/brand