Min 9-pin or 7-pin sockets to fit octal-sized holes?

ray_moth · 31st December 2007, 08:01 AM

If I have to use B9A or B7G tubes but my chassis already has holes and screw-centers for octals, does anyone know where I can get suitable bases to fit the holes? I've tried Googling but without knowing what search parameters to use it's like looking for a needle in a haystack.

Svein_B · 31st December 2007, 08:56 AM

These guys in HK have some beautiful tube socket plates and other nice metal parts:
wt4c.com

SveinB.

Eli Duttman · 31st December 2007, 10:38 AM

Ray,

Bottlehead sells Octal to Noval "hole shrinkers".

mikecj · 31st December 2007, 03:46 PM

Weber, of "weber speakers" and guitar amp kits also has plate adapters for octal to 9pin.

ray_moth · 31st December 2007, 10:42 PM

Thanks everyone, that's great!

SHiFTY · 31st December 2007, 11:35 PM

You could also put in some spacers and long screws and mount the small noval tubes well below the chassis, like this random google link:

http://www.indiespinzone.com/stylin.html

Poindexter · 1st January 2008, 03:04 AM

Ray,

You come up dry, talk to me. I can take care of this.

Hau'oli Makahiki Hou,

Poinz

ray_moth · 1st January 2008, 04:59 AM

Hi Poinz,

I haven't any specific use in mind right now but there are some 9-pin and 7-pin tubes that interest me, and the tube holes I've drilled in my chassis are for octal bases, with a couple B7G.

Right now, I'm using 6SL7, 6SN7, 6D22S and EL34 types, plus a pair of 6AU6s as CCSs. The results with these tubes are good enough but I love to experiment. The types I'm interested in trying one day include EF86 (or EF40), ECC40, EC91, 6DJ8/E88CC.

Poindexter · 1st January 2008, 05:15 PM

I'm with you, Ray,

I've been searching the manuals and datasheet sites for neglected gems and have come up with a couple real winners, both 7-pin. 6GK5 is a mongo driver tube that can do away with input tubes; rp=8K, gm=8.5S. 6T4 I'm using as a line amp tube; rp=1.8K, gm=5.6S. No sections-in-a-bottle matching difficulties, they're both teevee tubes, so when I asked my vendors, they said, 'We got millions, how many hundred you want?'.

There are some cool devices out there in the dusty bins, we just got to do our homework.

Aloha,

Poinz

31st December 2007, 08:01 AM	#1
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Min 9-pin or 7-pin sockets to fit octal-sized holes? If I have to use B9A or B7G tubes but my chassis already has holes and screw-centers for octals, does anyone know where I can get suitable bases to fit the holes? I've tried Googling but without knowing what search parameters to use it's like looking for a needle in a haystack.

31st December 2007, 10:38 AM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Ray, Bottlehead sells Octal to Noval "hole shrinkers". __________________ Eli D.

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31st December 2007, 08:56 AM	#2
Svein_B diyAudio Member Join Date: Oct 2005	These guys in HK have some beautiful tube socket plates and other nice metal parts: wt4c.com SveinB.

31st December 2007, 03:46 PM	#4
mikecj diyAudio Member Join Date: Dec 2007	Weber, of "weber speakers" and guitar amp kits also has plate adapters for octal to 9pin.

31st December 2007, 10:42 PM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Thanks everyone, that's great!

31st December 2007, 11:35 PM	#6
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	You could also put in some spacers and long screws and mount the small noval tubes well below the chassis, like this random google link: http://www.indiespinzone.com/stylin.html

1st January 2008, 03:04 AM	#7
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Ray, You come up dry, talk to me. I can take care of this. Hau'oli Makahiki Hou, Poinz

1st January 2008, 04:59 AM	#8
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Hi Poinz, I haven't any specific use in mind right now but there are some 9-pin and 7-pin tubes that interest me, and the tube holes I've drilled in my chassis are for octal bases, with a couple B7G. Right now, I'm using 6SL7, 6SN7, 6D22S and EL34 types, plus a pair of 6AU6s as CCSs. The results with these tubes are good enough but I love to experiment. The types I'm interested in trying one day include EF86 (or EF40), ECC40, EC91, 6DJ8/E88CC.

1st January 2008, 05:15 PM	#9
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	I'm with you, Ray, I've been searching the manuals and datasheet sites for neglected gems and have come up with a couple real winners, both 7-pin. 6GK5 is a mongo driver tube that can do away with input tubes; rp=8K, gm=8.5S. 6T4 I'm using as a line amp tube; rp=1.8K, gm=5.6S. No sections-in-a-bottle matching difficulties, they're both teevee tubes, so when I asked my vendors, they said, 'We got millions, how many hundred you want?'. There are some cool devices out there in the dusty bins, we just got to do our homework. Aloha, Poinz

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