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

ray_moth 31st December 2007 09:01 AM

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.

Svein_B 31st December 2007 09:56 AM

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


Eli Duttman 31st December 2007 11:38 AM


Bottlehead sells Octal to Noval "hole shrinkers".

mikecj 31st December 2007 04:46 PM

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

ray_moth 31st December 2007 11:42 PM

Thanks everyone, that's great!

SHiFTY 1st January 2008 12:35 AM

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:

Poindexter 1st January 2008 04:04 AM


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

Hau'oli Makahiki Hou,


ray_moth 1st January 2008 05:59 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 06:15 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.



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