ECC81

[paulf-2007]

What and where are they used,as I mistakenly bought a pair of British made Mullards when I should have bought ECC82. My phono stage uses a pair of 12AX7 and 12AU7 and I bought a pair of Mullard 1964 ECC83 and they have improved it no end, the ones I removed were a Marshall branded 12AX7 and a Fender ECC83. I don't know what ECC81 are used for and may just hold onto them as an investment if they sought after.

[Firebottle]

ECC81 is a mid gain valve, against the '82 low gain and '83 high gain.

Can be used as driver stage or input stage for power amp, or gain stage for a preamp.
I used one a the 2nd valve in an all valve phono stage.

[paulf-2007]

Thanks, are they commonly used and worth keeping for the future

[Arkless Electronics]

They are commonly used and are pin for pin compatible with ECC83 and 82 but different in characteristics. Higher current and greater transconductance than 83 but lower mu.
I have Mullard mil spec ECC81's available NOS.

[paulf-2007]

Thanks Jez, but I'm not looking to buy but bought a pair mistakenly when I needed ECC82 which I now have.