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-   -   5687 (http://www.diyaudio.com/forums/tubes-valves/30420-5687.html)

Alastair E 17th March 2004 11:29 AM

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!

fdegrove 17th March 2004 12:11 PM

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.

Cheers,;)

filippo22 17th March 2004 02:28 PM

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.

ciao
Filippo
www.audiofanatic.it

PS a 6922 version of the Supertotem is now on-line on www.audiofanatic.it

i_should_coco 17th March 2004 02:55 PM

How about 6BL7/6BX7? They're pretty good as drivers.

Cheers/
Pete

Alastair E 18th March 2004 01:57 PM

6bl7
 
looked at the 'BL7, it could be a good performer, bit hard to come by, I geuss Ill have to search harder!!

fdegrove 18th March 2004 02:02 PM

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,;)

Alastair E 18th March 2004 09:20 PM

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

fdegrove 18th March 2004 09:37 PM

Hi,

No, both are twin triodes.

Cheers,;)


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