ECC85

stenak · 4th July 2011, 11:54 AM

Why are there not so many (any?) projects, preamp or riaa with the ECC85 tube?

gk7 · 4th July 2011, 12:22 PM

Probably because it´s a VHF tube for use in b/w TV sets.

SY · 4th July 2011, 12:29 PM

Being a VHF tube is no bar (ECC88, for example, has been used in many successful designs). But the ECC85 doesn't bring anything special to the audio table. An ECC81, for example, will have similar mu and gm, but has better linearity in voltage amplifiers and is readily available (still in production).

With some effort, one could use the ECC85 in a reasonably good preamp, but why bother?

toprepairman · 4th July 2011, 12:34 PM

The ECC88 also makes a great concertina phase splitter.

DF96 · 4th July 2011, 01:10 PM

ECC85 is essentially an ECC81 on an ECC88-like base. NOS is more expensive than many ECC81, and I don't think anyone is still making it. Best to leave ECC85 for all the 1950s FM radios which use it, unless you really need an inter-section screen.

K.A.B · 4th July 2011, 02:11 PM

Good continue to tell how bad ECC85 is then I get them for myself. If you want one tube that is more linear instead of ECC85, you can use the 6N1P.

Anders

rtsang · 4th July 2011, 02:26 PM

Please don't waste the ECC85 for any line level use. All my valve FM radios need them. Later productions from the Eastern Bloc sometime do not work and these AM/FM sets eats them quite fast.

Ray

the_manta · 4th July 2011, 02:30 PM

Quote:

Originally Posted by toprepairman

The ECC88 also makes a great concertina phase splitter.

It makes an even more better Cascode stage !

Quote:

Originally Posted by DF96

NOS is more expensive than many ECC81, and I don't think anyone is still making it. Best to leave ECC85 for all the 1950s FM radios which use it, unless you really need an inter-section screen.

Yep, nothing further to add to ! From time to time I'm restoring old radios and the ECC85 is essential in most FM Tuners. Please use ECC81, it's basically the same valve ! The same counts for ECC84, ECC804, ECC807 etc. which are rare and needed as spares for existing commercial products. There are soooo many other double triodes you could use, please do so.

llwhtt · 4th July 2011, 03:21 PM

I don't know if there are any Luxman fans out there but look at just about any Luxman power amp you'll find at least one ECC85/6AQ8 in the circuit.

Craig

mississippi · 4th July 2011, 05:48 PM

In some Philips amplifiers the ECC85 is used as the fasesplitter for the power end tubes EL36.

4th July 2011, 11:54 AM	#1
stenak diyAudio Member Join Date: Nov 2009	ECC85 Why are there not so many (any?) projects, preamp or riaa with the ECC85 tube?

4th July 2011, 12:22 PM	#2
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	Probably because it´s a VHF tube for use in b/w TV sets. __________________ Regards, Georg

4th July 2011, 12:29 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Being a VHF tube is no bar (ECC88, for example, has been used in many successful designs). But the ECC85 doesn't bring anything special to the audio table. An ECC81, for example, will have similar mu and gm, but has better linearity in voltage amplifiers and is readily available (still in production). With some effort, one could use the ECC85 in a reasonably good preamp, but why bother? __________________ If there's a sucker born every minute, where do the rest of them come from?

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4th July 2011, 12:34 PM	#4
toprepairman diyAudio Member Join Date: Nov 2010	The ECC88 also makes a great concertina phase splitter.

4th July 2011, 01:10 PM	#5
DF96 diyAudio Member Join Date: May 2007	ECC85 is essentially an ECC81 on an ECC88-like base. NOS is more expensive than many ECC81, and I don't think anyone is still making it. Best to leave ECC85 for all the 1950s FM radios which use it, unless you really need an inter-section screen.

4th July 2011, 02:11 PM	#6
K.A.B diyAudio Member Join Date: Nov 2005 Location: Sweden	Good continue to tell how bad ECC85 is then I get them for myself. If you want one tube that is more linear instead of ECC85, you can use the 6N1P. Anders

4th July 2011, 02:26 PM	#7
rtsang diyAudio Member Join Date: Aug 2005	Please don't waste the ECC85 for any line level use. All my valve FM radios need them. Later productions from the Eastern Bloc sometime do not work and these AM/FM sets eats them quite fast. Ray

4th July 2011, 03:21 PM	#9
llwhtt diyAudio Member Join Date: Jun 2008	I don't know if there are any Luxman fans out there but look at just about any Luxman power amp you'll find at least one ECC85/6AQ8 in the circuit. Craig

4th July 2011, 05:48 PM	#10
mississippi diyAudio Member Join Date: Apr 2006 Location: holland	In some Philips amplifiers the ECC85 is used as the fasesplitter for the power end tubes EL36.

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