B9A valve base size - UK Vintage Radio Repair and Restoration Discussion Forum

John10b · 19th Jun 2019, 7:07 pm

Just thought I would mention this topic, for all of you that are already aware I apologise.
I just purchased a new valve base (ECC83) for the Blackbox that I’m restoring.
I removed the original faulty McMurdo base but could not insert the new one.
The Original base has a diameter of about 18mm, the new one about 22mm.
So just be aware of this if you intend to do any restoration.
There is information on this site giving full details of valve base dimensions which I found rather late in the day.
Cheers
John
PS. I have posted a request in the Wanted Section

ionburn · 20th Jun 2019, 8:23 pm

I have seen a difference in ones I have used, dependant on whether the base is fixed from below or above the chassis (ie the base has smaller diameter at the bottom). I don't repair/ refurbish much to have experience in this for such purposes.

Nuvistor · 20th Jun 2019, 9:06 pm

Will these do the job, they have plenty in stock.
https://www.langrex.co.uk/products/b...mounting-base/

John10b · 20th Jun 2019, 10:02 pm

Thank you for the link Frank. You have probably read the discussion on the two different sizes, I note that Langres don’t give dimensions but they look right. I’ve been lucky as a Forum member is sending me a suitable one. Thanks again Frank.
Cheers
John

John10b · 30th Jun 2019, 7:51 pm

Valve base received with thanks to Mickm3for.
This thread can be closed.
Cheers
John

19th Jun 2019, 7:07 pm	#1
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	B9A valve base size Just thought I would mention this topic, for all of you that are already aware I apologise. I just purchased a new valve base (ECC83) for the Blackbox that I’m restoring. I removed the original faulty McMurdo base but could not insert the new one. The Original base has a diameter of about 18mm, the new one about 22mm. So just be aware of this if you intend to do any restoration. There is information on this site giving full details of valve base dimensions which I found rather late in the day. Cheers John PS. I have posted a request in the Wanted Section

20th Jun 2019, 8:23 pm	#2
ionburn Heptode Join Date: Dec 2014 Location: Lincoln, Lincolnshire, UK. Posts: 583	Re: B9A valve base size I have seen a difference in ones I have used, dependant on whether the base is fixed from below or above the chassis (ie the base has smaller diameter at the bottom). I don't repair/ refurbish much to have experience in this for such purposes.

20th Jun 2019, 9:06 pm	#3
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: B9A valve base size Will these do the job, they have plenty in stock. https://www.langrex.co.uk/products/b...mounting-base/ __________________ Frank

20th Jun 2019, 10:02 pm	#4
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: B9A valve base size Thank you for the link Frank. You have probably read the discussion on the two different sizes, I note that Langres don’t give dimensions but they look right. I’ve been lucky as a Forum member is sending me a suitable one. Thanks again Frank. Cheers John

30th Jun 2019, 7:51 pm	#5
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: B9A valve base size Valve base received with thanks to Mickm3for. This thread can be closed. Cheers John