5687

Alastair E · 17th March 2004, 11:29 AM

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

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

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,

17th March 2004, 11:29 AM	#1
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	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! __________________ Das Beste Oder Nichts

17th March 2004, 12:11 PM	#2
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	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, __________________ Frank

18th March 2004, 01:57 PM	#5
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	6bl7 looked at the 'BL7, it could be a good performer, bit hard to come by, I geuss Ill have to search harder!! __________________ Das Beste Oder Nichts

18th March 2004, 09:20 PM	#7
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	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 __________________ Das Beste Oder Nichts

18th March 2004, 09:37 PM	#8
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, No, both are twin triodes. Cheers, __________________ Frank


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17th March 2004, 02:28 PM	#3
filippo22 diyAudio Member Join Date: Jul 2001 Location: Italy	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

17th March 2004, 02:55 PM	#4
i_should_coco diyAudio Member Join Date: Dec 2003 Location: Surrey, UK	How about 6BL7/6BX7? They're pretty good as drivers. Cheers/ Pete

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