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e80cc = 12au7?

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Danielle Holden

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Apr 6, 2000, 3:00:00 AM4/6/00
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Someone is selling e80cc's on ebay and claiming they are can be used in
place of a 12au7. Is this true? I cant confirm the equivalence
anywhere.

John

Darryl

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Apr 6, 2000, 3:00:00 AM4/6/00
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Hi Danielle Holden,

You were saying......


Pinout is the same, and this whole family is pretty much interchangeable (with
varying gains).

Ecc83 is a 12AX7
Ecc81 is a 12AT7

The fact that it is E80CC rather than ECC80 means it is a better quality tube
I'm told.

But I can't verify equivalence, although it'll probably work.

Darryl

Jasiu Barczynski

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Apr 6, 2000, 3:00:00 AM4/6/00
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Hi,

Darryl wrote:
> Ecc83 is a 12AX7
> Ecc81 is a 12AT7

E80CC is a 6085

> The fact that it is E80CC rather than ECC80 means it is a better quality tube

Usually, but not always...
For instance E80F differs a lot from EF80 (while premium EF80 is EF800).

I have never seen ECC80. Anybody?...

Similar situation with heaters:
PCC85 is relative to ECC85 but
PL86 = EL84 (excl. heater...) while
EL86 = PL84


Jasiu

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Ryszard Jan Barczynski; Physics Dept.; Techn. Univ. of Gdansk; Poland
http://www.mif.pg.gda.pl/homepages/jasiu tel.(+4858)3471832
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per_ho...@my-deja.com

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Apr 6, 2000, 3:00:00 AM4/6/00
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In article <38EC3802...@mif.pg.gda.pl>,

Jasiu Barczynski <ja...@mif.pg.gda.pl> wrote:
> Hi,
>
> Darryl wrote:
> > Ecc83 is a 12AX7
> > Ecc81 is a 12AT7
> E80CC is a 6085
An really not the best sub for 12AU7, though 'S' is quite alike (but
current consubtion, both cathode and heater, differs).

> I have never seen ECC80. Anybody?...
When you bring it up, no...

> Similar situation with heaters:
> PCC85 is relative to ECC85 but
> PL86 = EL84 (excl. heater...) while
> EL86 = PL84
Well, one should be careful to think UCC,PCC,ECC (a.s.o.) with the same
number is equal (except for heater). THe denomination is
heater, type, socket, running number (with odd being development on
previous odd, and even on even (for "small" pentodes(F) odds are sharp
cu off)). So if there already are a PL84 and a EL82 (same or different),
the next power pentode developed would be PL86 and EL84 (same or
different).
> Jasiu
Thanks for the 'P' evivalent on EL86.
Besides: Many are conserned about the "noice" fron 6.3V AC (E-series),
but hov about the 300mA (P-series). ECC83 and PCC83 would be as noicy
(6V both), but PL84 would be 16V compared to EL86 6V (UL84 is 45V while
EL84 is 6V). Fortunate that small signal tubes use little heater power
and so low voltages on P and U series.
/Pär


Sent via Deja.com http://www.deja.com/
Before you buy.

Russ Sadd

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Apr 6, 2000, 3:00:00 AM4/6/00
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"Danielle Holden" <jd...@one.net.au> wrote in message
news:38EC21...@one.net.au...

> Someone is selling e80cc's on ebay and claiming they are can be used in
> place of a 12au7. Is this true? I cant confirm the equivalence
> anywhere.

The E80CC is equivalent to an American 6085. This isn't, however, a 12AU7 /
ECC82. We're talking about a small double-triode, but one with very
different properties (i.e. mu of 37 instead of 17, using 6mA plate current
on average instead of 11ma). In conventional R-C stages, it may be possible
to directly substitute the two without anything going drastically wrong, but
you'll probably end up with more gain than you need and a good bit of extra
distortion. An E80CC won't be able to give the same 'kick' as an ECC82 when
used as a driver - it'll be putting out less power and with a higher anode
impedance.

My advice is always to take an eBay "substitution" with more than a pinch of
salt. I've seen too many 12E1 sweep tubes sold as "KT88 equivalents", not to
mention Mullard ECC32s sold as "premium 6SN7s"! This kind of sale is
guaranteed to (1) make the seller a lot of money and (2) gives the buyer a
good chance of burning out the valves along with his or her amplifier.

Thankfully, this "equivalence" is relatively harmless, and may only result
in decreased performance.

Best regards,

Russ Sadd
Birmingham, UK

--
E-mail: gri...@dircon.co.uk
WWW: http://www.griffon.dircon.co.uk

P. de R. L.

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Apr 6, 2000, 3:00:00 AM4/6/00
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Yes, I've played with 12E1s, and it is not an equivalent for KT88. On the
other hand it is a very good valve. I am certain it would run as a triode
at at least 400V - probably more - despite the screen grid limit of 300V.
(cf 6146 G2 max = 250V but there are factory triode curves for 400V).

12E1 as a triode with decent current gives ra of 700 ohms and given the fact
that there are thousands about and cheap - it's quite a good bet.

paul
Russ Sadd <gri...@dircon.co.uk> wrote in message
news:IW1H4.900$VZ6.1...@news.dircon.co.uk...

per_ho...@my-deja.com

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Apr 7, 2000, 3:00:00 AM4/7/00
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In article <8ciukl$gcs$1...@gxsn.com>,

"P. de R. L." <tri...@bow-tie.org.uk> wrote:
> I am certain it would run as a triode at at least 400V - probably
> more - despite the screen grid limit of 300V.
> (cf 6146 G2 max = 250V but there are factory triode curves for 400V).
--- cute cut ---
The limit in screen voltage is that it would attract to much current in
pentode mode when the plate current drops to - say - 100-150V (see
screen current curves). Many tubes - as 807, EL84, 6L6 and even EL34 -
can TO MY KNOWLEDGE run with the anode max value on the screen as well
when connected as trodes (coz the problem of current rush is out when
the screen drops with the plate).
Please correct me if I'm wrong, though it worked nice so far ;-)

konrad...@gmx.at

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Jul 6, 2015, 10:17:00 AM7/6/15
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Am Donnerstag, 6. April 2000 09:00:00 UTC+2 schrieb Danielle Holden:
> Someone is selling e80cc's on ebay and claiming they are can be used in
> place of a 12au7. Is this true? I cant confirm the equivalence
> anywhere.
>
> John

I use a Chinese Sonicgear amplifier for my PC. It actually uses one ECC82 / 12AU7 tube for preamp. I replaced it with a NOS Tungsram E80CC and never regretted that. The improvement in sound is unbelieveable.
But be cautious: may be the E80CC can replace an ECC82 only for audio but not for driver.

Peter Wieck

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Jul 6, 2015, 2:26:35 PM7/6/15
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On Thursday, April 6, 2000 at 3:00:00 AM UTC-4, Danielle Holden wrote:
> Someone is selling e80cc's on ebay and claiming they are can be used in
> place of a 12au7. Is this true? I cant confirm the equivalence
> anywhere.
>
> John

Don't.

90% of the time, for pure audio signal processing, it will be fine, with perhaps a bit less gain and a bit more bass. If used as a drive, you _will_ be unhappy.

10% of the time, it will be a disaster in any case.

There are MANY better substitutes in the 12XX7 family such that you need not needlessly enrich an eBay seller making a dubious claim.

Peter Wieck
Melrose Park, PA

John L Stewart

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Jul 8, 2015, 7:37:04 AM7/8/15
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konrad...@gmx.at;988400 Wrote:
> Am Donnerstag, 6. April 2000 09:00:00 UTC+2 schrieb Danielle Holden:-
> > Someone is selling e80cc's on ebay and claiming they are can be used
> in
> > place of a 12au7. Is this true? I cant confirm the equivalence
> > anywhere.
> >
> > John-
>
> I use a Chinese Sonicgear amplifier for my PC. It actually uses one
> ECC82 / 12AU7 tube for preamp. I replaced it with a NOS Tungsram E80CC
> and never regretted that. The improvement in sound is unbelieveable.
> But be cautious: may be the E80CC can replace an ECC82 only for audio
> but not for driver.

The e80cc is neither a 12AU7 or 12AX7. See it here-

http://frank.pocnet.net/sheets/190/e/E80CC.pdf

& here-

http://frank.pocnet.net/sheets/009/e/E80CC.pdf

It is spec’d for digital applications, specifically cathode interface
caused by long ‘OFF’ periods. Should be AOK for audio!

Cheers to all, John L Stewart


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John L Stewart

jh

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Jul 8, 2015, 5:56:42 PM7/8/15
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...it is a wonderfull tube for audio - pristine

regards

Jochen

Peter Wieck

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Jul 10, 2015, 8:55:52 AM7/10/15
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Sure it is! But it is NOT always a valid substitute for a 12AU7, nor does it equal a 12AU7. That would be the point. And representing it as such is simply wrong.

jh

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Jul 12, 2015, 10:26:34 AM7/12/15
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Did I?

I don't think so.

The E800CC is still a wonderful tube for audio

;-)

regards

Jochen

Big Bad Bob

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Sep 10, 2015, 1:17:25 AM9/10/15
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On 07/12/15 07:26, jh so wittily quipped:
I don't think anyone disputes that. but applications requiring a 12AU7
[let's say a reverb drive or AB2 drive] might not work the same. I
think *that* was the point.

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