6n3p = ECC85 ???

[jamesjung21]

Hi guys,

Is 6n3p a Russian equivalent of ECC85??

I've got 2 beautiful PCC85 Telefunkens in unopened packages.

And I would like to use them in the following preamp:

http://members.lycos.nl/Aren/id42.htm

 

[fdegrove]

Hi,

Even though some vendors seem to say 6N3-P and ECC85 are equivalent, they aren't at all.

If anything the 6N3-P is closer to the 2C51.

Cheers,

 

[jamesjung21]

Isn't it possible to substitute the 6n3p with an ECC85, even though they are not equivalent?

I mean, just like substituting a 6SN7 with an ECC32...

Quote: " Same as Mullard ECC32, it's not equivalent to 6SN7, but all we know ECC32 is one of the hottest 6SN7 substitution in the market nowadays... "

 

[jamesjung21]

Any comment?

 

[fdegrove]

Hi,

What may somehow hold true for the ECC32 and the 6SN7 just isn't true for the 6N3-P and the ECC85.

That doesn't mean you can't build a similar circuit with an ECC85 to what's been done with the 6N3-P.

It's just that the two are NOT equivalents in any way unless one would claim all pin to pin compatible valves to be equivalents.
We all know that that's just not true.

Cheers,

 

[planet10]

I have a box full of ECC85s, be nice to find a use for them. I was thinking along the lines of something like this, or as a common cathode driver stage for a little SEP.

dave

 

[fdegrove]

Hi,

Dave, et all,

Think of the ECC85/6AQ8 as some sort of ECC81/12AT7 with different heater requirements.

So, with a little bit of math and imagination you could use it wherever a AT7 is used: driver, phase splitter, input stage...whatever.

Cheers,

 

[planet10]

Think of the ECC85/6AQ8 as some sort of ECC81/12AT7 with different heater requirements.

Thanx Frank... they do look close, at least in the basics...

ECC85

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ECC81

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dave

 

[DougL]

And I would like to use them in the following preamp:

Nice looking preamp.

No reason not to build something like it with ecc85's

Buy the Tube cad program, and use it to bias your selected tubes.
We can help.

The Link to Tube Cad


Good Luck.

Doug

 

[dhaen]

Sacrilege

I have a box full of ECC85s, be nice to find a use for them. I was thinking along the lines of something like this, or as a common cathode driver stage for a little SEP.

dave

They were meant for FM front-ends. Seems a shame to use them for AF

 

[planet10]

Re: Sacrilege

They were meant for FM front-ends. Seems a shame to use them for AF

That's where they all came from... i don't see much market for them thou...

dave

 

[jamesjung21]

 

[TRANSDUCEReng]

I have a box full of ECC85s, be nice to find a use for them. I was thinking along the lines of something like this, or as a common cathode driver stage for a little SEP.

dave

Hi Dave did ever make some amps with EcC85`s ?? i`m also looking for a nice audio amp project fro them .Regards

 

[Tubelab_com]

That's where they all came from... i don't see much market for them thou...

They are not in large availability therefore sell for $10+ each. I did use the 26AQ8 / UCC85 (cheap) in a recent low budget guitar amp build. They worked out well, although some can be rather microphonic.

 

[DF96]

Sell them to people who play with old radios, as they are used in FM front-ends and are getting expensive as nobody is ever likely to make them again. For audio use a 12AT7 - almost identical characteristics (slightly different pinout) and cheap as chips.

 

[rtsang]

Please do refrain from using them in audioband. ECC85 power most FM front ends ) in most tube FM radios and they do die pretty quickly (except in some SABA radios where they use 2 EC92). I have a few NOS East Germany made RFT ECC85 that do not seem to pull the stations. An old Mullard or Telefunken will pull many more stations.

Even though DAB maybe replacing FM, the ECC85 stock may die faster and old radio collectors like me might not be able to receive FM with tubes.

 

[DF96]

Just in case anyone asks: we can't use 12AT7 in an FM front end because it has no internal screen, which was the main advantage of the ECC85. Rewiring the heater would be messy too, as RF components should not be disturbed once aligned.

 

[DeathRex]

You can use a 6DT8 (12AT7 in 9AJ package). Just requires a little retuning. I've put in several in my German radios, because 6DT8s are cheap. Seems to be about 90% as strong as a ECC85.

 

[DF96]

I think the 6DT8 is even rarer than the ECC85/6AQ8.

 

[DeathRex]

Not so rare in the US. The 6DT8 was a common TV tube. You can find them here at AES and ESRC for about $3. While the 6AQ8/ECC85 is $15. You can even find them NOS on Ebay for $2.