Unknown tube in Rohde & Schwarz HS86 Netzgerät |Radiomuseum.org

? Unknown tube in Rohde & Schwarz HS86 Netzgerät

11.May.12 14:13

129

Allan So (HK)
Articles: 15
Count of Thanks: 8

Dear Senior members,

I have a Rohde & Schwarz HS86 mains voltage stabilizer, it has one EL34 and a diode called D1.8/1.2

It looks like a high voltage diode (hochspannung diode) made by Heimann. I need to buy one or two as backup, but I could not find any from tube sellers worldwide (ebay), please advise where I could buy this diode.

Danke!

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not a high voltage diode

12.May.12 20:35

129 from 4644

Wolfgang Holtmann (NL)
Editor
Articles: 965
Count of Thanks: 8

Hallo Allan

Concerning the D1,8/1,2:

May I draw your attention to the excellent article over a tube with nearly the same function, the 2AS15.

Kind regards.

P.S.

On second thought, the Heimann D1,8/1,2 may be originally utilized as a high voltage diode in other applications?

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Thank you so much!

13.May.12 05:15

167 from 4644

Allan So (HK)
Articles: 15
Count of Thanks: 7

Dear Mr. Holtmann,

The article is really useful, and the circuit ressembles the R&S HS86 a bit(the "saturable reactor" looks like the choke with 3 coil partitions) I don't know if this circuit has anything to do with a Ferroresonant Transformer for voltage regulation. Meanwhile a friend of mine will sell me one of his D1.8/1.2 tubes, at least I have two on hand for one or two decades (I guess these tubes have long lives). I measure the voltage inside the R&S HS86, the plate cap carries 25VDC only, AC ripple is minimal, no sharp spikes etc. Current should not be high since R&S uses thin wire to connect the tube (I have not measured its current).

Anyway, I will search for 2AS15 and stock some as backup.

Thank you so much Mr. Holtmann! Keep in touch!

Kindest regards

Allan

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