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

[Wakefield Turntables]

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

2259122592

Thanks

Andy

[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-Str-85-10-85A2-0G3-STV85-10-Voltage-Reference-Tube-NEW-SAME-CODE/263014886994?epid=168095732&hash=item3d3ce8ae52:g:l3EAAOSwxu5ZMC1F

[User211]

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

[Wakefield Turntables]

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-Str-85-10-85A2-0G3-STV85-10-Voltage-Reference-Tube-NEW-SAME-CODE/263014886994?epid=168095732&hash=item3d3ce8ae52:g:l3EAAOSwxu5ZMC1F

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


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

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

[Marco]

Yes ;)

Marco.

[Wakefield Turntables]

Yes ;)

Marco.

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