OBC3
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Forum contributions about this tube
OBC3
Threads: 1 | Posts: 3
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Hits: 7381 Replies: 2
Mysterious P-, O- and U- tube-series:
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Jacob Roschy
07.Oct.07 |
1
By doing research in the "Brans Tube Vademecum 1947", as well as in the "Röhren-Codex", I found 3 mysterious tube- series:
- an O - series with 0.15 A heater current, consisting of OBC3, OBF2, OCH4, OH4, OF1, OF5, OF9 and OM5.
By further investigating I found out, many of them are similar or equal to other better known tube types, some others differ only in heater data.
Here are the results as follows:
Equivalent types:
Types with equal characteristics, but different heater voltage ( heater current = 0.15 A ) :
- Next I found a P - series with 0.3 A heater current, consisting of PAB1, PBF2, PF9, PH4 and PM5.
Equivalent to other tube types are:
Types with equal characteristics, but different base diagram or heater data ( heater current = 0.3 A, voltage = 6.3 V ) :
- At last I found an U - series with 0.1 A heater current, consisting of UBC1, UBF2, UF8 and UL1:
Types with equal characteristics, but different heater voltage ( heater current = 0.1 A ) :
By investigating in the internet about these tubes, I found as follows:
- On this site: http://rt00117m.eresmas.net/radios-v.htm
a Radio type AL4112H, made by PHILIPS INDUSTRIA ARGENTINA is shown, which has the tube lineup: OH4 OF5 OBC1 50L6GT 35Z5GT.
The use of these O- types together with 50L6GT and 35Z5GT clearly profes the 0.15 A heater current of the O- tube series, unlike as in the polish "Universal Vademecum", as mentined in
«Anybody knows this tuning indicator?» post 3 - (see also there).
- A further site: http://radioantigo.com.br/philips.htm
shows another Philips set, Mod. AL552-H-61 ( 1942 ), also from Philips-Argentina,
tube lineup is: PH4 PF9 PF9 PBF2 PM5 25L6 25Z6.
The use of these P- types together with 25L6GT and 25Z5GT clearly profes the 0.3 A heater current of these P- tube series, also unlike as told in the polish "Universal Vademecum".
These interesting internet finds also shows to the South American market of the Philips company as the origin of these elsewhere mysterious tubes.
By now, I don't know, whether Philips produced these tubes in their mother company in the Netherlands especially for the South American market, or if PHILIPS INDUSTRIA ARGENTINA had an own tube production line there.
Best Regards,
Jacob Roschy
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Juan Carlos FRANCO
30.Oct.09 |
2
Hi Jacob !
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Jacob Roschy
31.Oct.09 |
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Hi Juan Carlos, many thanks for this interesting contribution ! This tubes series released by Philips Argentina is still most unknown to the rest of the world, so any information about them is very welcome ! We tube collectors would be very delighted if you could post pictures of these tubes OH4, OF5 and OBC1 into their pages here in the RM. Tanks in advance and best Regards, Jacob |
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OBC3
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