HELP! What's this valve from my Croft Preamp?

I'm in the process of tube rolling everything in my Croft Pre-amp. Can someone please tell me the name of this valve?

Attachment 22591Attachment 22592

Thanks

Andy

Hi Andy,
It's exactly what it appears, it is an 85A2. It is a voltage reference tube similar to this

https://www.ebay.co.uk/itm/QUAD-RFT-...EAAOSwxu5ZMC1F

My 211 power amps use them and I have a box full of NOS Amperex spares.

Quote:

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Originally Posted by Firebottle

Hi Andy,
It's exactly what it appears, it is an 85A2. It is a voltage reference tube similar to this

https://www.ebay.co.uk/itm/QUAD-RFT-...EAAOSwxu5ZMC1F

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Alan, I wasn't 100% sure as some of the writing has worn away, but thanks for taking time to reply.

Quote:

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Originally Posted by User211

My 211 power amps use them and I have a box full of NOS Amperex spares.

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Ahhhh! Have you ever tried rolling them to assess the effects?

Yes ;)

Marco.

Quote:

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Originally Posted by Marco

Yes ;)

Marco.

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Hmmmm, according to some they shouldn't have any effect other than work as a voltage regulator.