#47 DH pentode operated in triode - diyAudio
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Old 17th May 2003, 03:32 PM   #1
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Unhappy #47 DH pentode operated in triode

Hi All,

I am looking for information for #47 operated in triode mode, anyone have tried it before? what is the V/I characteristic? and what is the best operation point?

Alan
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Old 17th May 2003, 11:34 PM   #2
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Default 47 pentode

Hi Allan

you can go to this

http://frank.pocnet.net/sheets/021/4/47.pdf

Good luck!
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Old 18th May 2003, 04:15 AM   #3
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Hi Dedessus,

Thanks for information. It seems that the URL cannot be access.

Besides, i've take a look on RCA databook RC-13, it does not show #47 triode mode operation curve, pls advise.

Alan
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Old 18th May 2003, 09:05 AM   #4
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Default 47 pentode

Sory Allan try with this url

http://frank.pocnet.net/sheets

And put in the case search (47),after you can download the pdf files and view some graphics.

I just scan two schematic of 47 (single-end and push-pull),
both of the 30's.

If you are interested, tell me

Good luck
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Old 18th May 2003, 10:10 AM   #5
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Hi Dedessus,

Yep, pls send me the schematic.
IN fact, i just want to use #47 to drive my 300B with using interstage trf, pls comment!

Alan
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Old 19th May 2003, 10:02 AM   #6
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Hi allan ,i remember now where i see something about the 47
and the nearly same tube 42 except for the heater (6.3 volts,direct heating)
After all you can find in the last url the pdf file of the 42 from
General electric but it's in french .
they talk about the replacement from the 47 by a 42
and tell about uses in triode with 42 in interstage,in triode
If you have 1 of those you can see is the same construction of valve,strange now!
Pearhaps with the value of the 42,you can find solution to your project.
I try to compress the schematics and send to you
Good luck
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Old 19th May 2003, 10:04 AM   #7
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Sorry is not GE but Sylvania PDF
GOOD LUCK
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