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Old 17th March 2004, 11:29 AM   #1
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Default 5687

Can anyone recommend an Octal upgrade / equivalent for the ever popular 5687, maybe with a higher Ia
It will be used for the dirver stage in an OTL, running 8xEL509
I would like to use an octal bottle rather than the B9a

Thanks!
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Old 17th March 2004, 12:11 PM   #2
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Hi,

ECC99, 12BH7A for noval types.

As far as octals go, I don't know of any twin triode of the top of my head but the dissimilar triodes may be a good idea; 6EA7, 6EM7 etc.

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Old 17th March 2004, 02:28 PM   #3
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search for some twin triode computer grade like the 6414 or 6350, the new ECC99 is also a good choice, but they are all 9pin base. If you need an octal base maybe you can use both triode of the old 6SN7GTA or the twin dissimilar triode mentioned above. Maybe also the 6BM8 in triode mode with a choke load is good for drive an OTL.

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Filippo
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PS a 6922 version of the Supertotem is now on-line on www.audiofanatic.it
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Old 17th March 2004, 02:55 PM   #4
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How about 6BL7/6BX7? They're pretty good as drivers.

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Pete
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Old 18th March 2004, 01:57 PM   #5
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Default 6bl7

looked at the 'BL7, it could be a good performer, bit hard to come by, I geuss Ill have to search harder!!
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Old 18th March 2004, 02:02 PM   #6
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Hi,

Quote:
looked at the 'BL7, it could be a good performer, bit hard to come by, I geuss Ill have to search harder!!
The BX7 is much better and will probably cost just as much anyway.

Cheers,
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Old 18th March 2004, 09:20 PM   #7
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Default BX or BL

I read somewhere the BX has different specs for each triode section, I was hoping to use one for each set of o/p valves, or even strap them together for lower impedance

Thanks

Al
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Old 18th March 2004, 09:37 PM   #8
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Hi,

No, both are twin triodes.

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