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Any 6085/ E80CC - Hands Down

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In Reply to: BEST 12AU7 posted by MOTO on April 03, 2001 at 22:15:34:

In many applications this can be used as a replacement.

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No way - E80CC/6085 is not a replacement for the ECC82/12AU7 - and may melt down or kill your amp. mb-de 08:39:28 04/05/01 (2)
Hi Geo!
This is _very_ bad advise you are giving. The E80CC has different heater (high current), different bias point/grid voltage, and different gm - it may work in some circuits, but will blow up in others - just compare the datasheets.
Others and myself have written about the topic - just do an archive search on AA-Tubes.
Regards
---mb---
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- I said MAY work as a replacement GEO 10:35:19 04/05/01 (1)
  I used one and have known others to use it in the driver stage of a SET amp without a problem. Your advice is correct. If you can get away with it, it is far superior to a 12AU7. Would you agree? Ask the manufacturer if you can use it is the best advice.
  - Yes - but with some caution and manufacturer's backing only... mb-de 06:36:00 04/06/01 (0)
    Hi Geo!
    I agree on what you say - _if_ it works, it is an interesting valve - but one has to verify that the circuit and power supply is appropriate - higher mu, different bias point and double heater current consumption may pose a problem for many amplifiers - therefore one must check the amp design or ask the amp manufacturer beforehand. Many a time it seems to work but destroys the expensive valves in a very short time, or worse...
    I have used the E80CC myself - it is a nice medium-mu dual triode which - if not overloaded by inappropriate operating conditions and overbias - gives a very good and long-term stable performance. I build a little SET with E80CCs (Philips Heerlen factory) as driver and 6S4Ss (Russian 6B4Gs) as output stages - works very well indeed.
    I used to have a studio record player which had a built-in preamp (modified to RIAA characteristics) with four E80CCs - when I got it, it was more than two decades old, with > 50000 hours of use on amp and bearings, and still on (1952) valves that had never been changed - on the tester they were still well inside the spec. Speaks for them, I think. The cartridge and the arm were 1970ies vintage, though - SME/Dynavector + step-up transformer.
    Regards,
    ---mb---
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Re: Any 6085/ E80CC - Hands Down robert 16:52:59 04/04/01 (0)
Not reallt - twice the current draw, different mU, completely different electrically - in regulated 12AU7 circuits the thing won't even light up properly!
The E80CC is a good tube but not in any way a 12AU7 sub. I believe that used in 12AU7 circuits, due to not even getting the filaments heated properly, it produces lots of 2nd order harmonic distortion, very big sounding and easy on the ear.

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