Ef86

[trancy]

where can I get EF86 tube or what kind of sustitute can I use?

thanks in advance

[Bas Horneman]

You can use PF86...but you would need to lower the heater voltage to 4,5v

Cheers,
Bas

[fdegrove]

Hi,

There should still be plenty EF86s around in Slovenia made by Tesla, Ei, Philips, Svetlana etc....

Substitutes are likely to be harder to find but range from the:

EF806S, E80F, EF804, EF804s and EF804S.

In the USA the 6267 is a direct substitute for the EF86.

Cheers,

[jamesjung21]

Quote: "Substitutes are likely to be harder to find but range from the:

EF806S, E80F, EF804, EF804s and EF804S."

Would it be OK to use EF80 or EF84 as well?

Are they direct ( or almost ) substitutions to EF86?

And this might be an off topic, but is UL84 a substitution of EL84? (With a different HT voltage).

[Jax]

Originally posted by jamesjung21
And this might be an off topic, but is UL84 a substitution of EL84? (With a different HT voltage).

[/B]

UL84 and PL84 are both EL86 with different heater voltage, not EL84. This is indeed confusing.

EF80 can be used for EF86 but they differ a lot, EF80 having much higher transconductance so a redesign may be needed.

[jamesjung21]

Isn't E80F a special quality version of EF80?

And what about EF84?

[Jax]

It's a confusing world. Sometimes a tube with numbers and last letters reversed indeed are longlife versions but not always.

E80F is very similar to EF86 but very different to EF80. E83F is very different to EF83.

I have no idea about EF84, never heard of it. Does it exist?

[jamesjung21]

I hate European valve coding system.

Sometimes it confuses people a lot (like UL/PL84)

The reason why I asked about EF80 is because I can find millions of TFK with <> easily

And I found that EF84 does not exsist... Oops!

Chears Jax!

[jamesjung21]

What kind of coding is this? 6DJ8 (we know that it's an ECC88)

This coding system confuses a lot as well...

e.g. : 16A8 is PCL82, but 6A8 isn't ECL82

50L6 isn't a substitution of 6L6 ( I think.... )

[dhaen]

The European valve coding system is the more logical one, though I admit it has some quirks.

AFAIK The EF86 is the only one that was specifically designed for audio use. All the other EF's were intended primarily for RF use. Some are almost useless for audio.

Even if your budget is limited, a couple of EF86's won't break the bank. If you're a poor student, maybe a kind Kiwi will take pity and post you a couple of them Since they are normally used at very low currents, they last practically for ever, even used ones.

edit: Typo's and flag recognition corrected