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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 13th Sep 2020, 8:39 pm   #1
Valvepower
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Default B7G base with 28.5mm (B9A) fixing centres

Hello,

Does anyone know of a supplier where I can get four large diameter B7G valve bases with the same 28.5mm mounting centres as used on the standard B9A base?

I have attached a photo of said base I found in the toy box, but I need four more of the critters!

Iím in throes of building a pair of amplifiers with bits lying around the workshop and in the toy box and these bases will save me making an adaptor plate or similar for the chassis I have here.

This is to sort of stuff I'd have fond at Swapmeets, Audiojumble and Fairs etc.

Terry
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Old 14th Sep 2020, 1:15 pm   #2
ColinTheAmpMan1
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Have you taken a look at and maybe an enquiry to, "Ask Jan First"?

http://www.fragjanzuerst.de/eindex.htm

He certainly has some phenolic B7G bases.

Colin.
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Old 14th Sep 2020, 3:45 pm   #3
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Hi Terry would the outputs be EL95 by any chance. Mick.
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Old 15th Sep 2020, 9:18 am   #4
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Hi Mick,

Thanks for the replies.

Mick, Yep, two of those kiddies in push-pull.

I'm pressing into service a pair of Radiospares Hygrade multi ratio transformers I've picked-up at Swapmeets over the years for the output transformer.

I can go into a bit more detail, however, I feel that would warrant its own thread though.

Terry
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Old 15th Sep 2020, 9:53 am   #5
vinrads
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Without looking I think Ra single ended is 10k, what would be Raa push pull? Regarding the cut out for the valve bases, just a thought what about a new aluminium top, then you can use the B7G valve bases. Mick.
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Old 16th Sep 2020, 10:02 am   #6
Valvepower
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Hi Mick,

Started a new thread EL95 bitís this and bitís Ďa that amp (from Wanted section) in "Home brew equipment"

https://www.vintage-radio.net/forum/...12#post1289812

Terry
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Old 16th Sep 2020, 11:58 am   #7
Radio Wrangler
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Think laterally or upside down or something like that!

If you've got B9A size holes in the chassis, why not fit B9A holders. Easier to find and bog standard. Change the valves to something like 6BW6 or 5763 and enjoy a cooler running, longer-lived bottle.

David
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Old 16th Sep 2020, 3:26 pm   #8
Diabolical Artificer
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Had a look at my base stash Terry and the only thing that fits are B7G skirted, see pics. I only have two and am not sure I'd be after flogging them but you may find some on Ebay. Had a look, can't see any.

I have a few scrap chassis like the one in the pic, I might be able to make some blanking plates up for you if you can't find a solution.



Andy.
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Old 17th Sep 2020, 10:48 am   #9
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Default Re: B7G base with 28.5mm (B9A) fixing centres

Hi Andy,

Thanks for the reply, yes, none on eBay, although I think I maybe on the scent of a supply. Thanks for the offer of making some plates, but with a fair wind behind me I may not have to resort to that - we'll see.

Hi David,

Yes, the 6BW6 is a good contender and a cracking valve, however I was looking to use what I have in the spares/toy box. I came by some EL95's valves in pile of valves I was given a good while back. The other constraint was the 7 watt and 60mA rating of the Hygrade transformer and the EL95 in PP with a Va of 250V fits the bill. As I said there will be some artistic licence using bits from the spares/toy box

Regards
Terry
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