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Old 23rd February 2005, 04:43 AM   #11
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A good thing is that the driving voltage swing requirements are low despite the low mu. Other than possibly the input capacitance issue, it should be easier to drive than a 300B!
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Old 23rd February 2005, 05:10 AM   #12
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How about a parallel feed arrangement? The DC would then be dealt with by the choke. Although the bandwidth would be poor, a couple of big power supply chokes would get you started. With this you might be able to use a big mains toroid as the output transformer. You'd just have to figure out the proper turns ratio.

Fun!
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Old 11th May 2012, 05:25 AM   #13
Pyka is offline Pyka  China
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7241 data:
http://www.mif.pg.gda.pl/homepages/f...127/7/7241.pdf
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Old 11th May 2012, 07:05 PM   #14
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Quote:
Originally Posted by audiousername View Post
Agreed that the OPT will be a lot of work, and perhaps I should add that current sharing between the three cathodes within the envelope might be a concern - so individual cathode resistors would be preferable if cathode bias is used.

But not agreed that valves should be referred to John before proper disposal!
Actually both John and audiousername are quite incorrect- such tubes should be sent to me for proper and safe disposal.

This tube is capable of 60 watts (8 ohms) in push-pull arrangement in an OTL with only one pair! This has the benefit of not having to engineer an OPT that otherwise does not exist. You can run plate voltages of only 150V and do rather well. You put a 5 ohm resistor in series with each cathode connection and that will help a lot to prevent current hogging (and will actually lower the output Z as a result). See What tubes for a tube amp? for suitable schematic.
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Old 13th May 2012, 06:02 PM   #15
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I would guess you could use it for audio, its really a fancy regulator tube though. Kinda like four 6080 or 6AS7 with 3 cathodes. the 3 grids and plates are tied internally.
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Old 14th May 2012, 01:35 AM   #16
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Quote:
Originally Posted by DavesNotHere View Post
I would guess you could use it for audio, its really a fancy regulator tube though. Kinda like four 6080 or 6AS7 with 3 cathodes. the 3 grids and plates are tied internally.
I know people that have used them in OTLs for years. Its quite linear, as that is a desirable characteristic in regulator tubes.
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