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Old 5th September 2005, 09:13 AM   #1
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Default ecc808 what to do

I have 4 Valvo & two Telefunken ECC808 NOS tubes. Any shematic`s around (preamp)? Any ideas? I searched Google - nothing.
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Old 5th September 2005, 10:38 AM   #2
Yvesm is offline Yvesm  France
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Hi,

Here:
http://www.mif.pg.gda.pl/homepages/f...4/e/ECC808.pdf

Looks like an ECC83 withe réduced plate dissipation ... and different pinout.

Yves.
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Old 5th September 2005, 11:52 AM   #3
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Yves wrote the important stuff already.

Might be interesting to sell them on Ebay, at least over here in Germany they give very good prices since they have been used in several commercial Klein & Hummel brand amps, lots of them still in use.

They are so scarce that Klein & Hummel gear often gets rewired to use ECC83/12AX7 instead.

Tom
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Old 5th September 2005, 12:19 PM   #4
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Yes, I did find data sheet , and I thought to use it as an replacement in my EAR-834P phono preamp (revireing required unfortunatly). But I wanted to try them in some preamp design. Didn`t found any shematic. Dusan Klimo used those tubes in his preamp I heard. Only stuf I found was this.

Thanks for info.

P.S.
What kind of prices does this tube achive on the market?
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Old 6th September 2005, 06:10 AM   #5
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They were used extensively by Rogers for many of their integrated amps and preamps so a search on Rogers might be worth while. These tubes were pretty unique in that they have a mu of 150 and so there simply is'nt anything that can be substituted for them (well not easily). They were often used in phono preamps with active RIAA for that reason. This means that once your current set of tubes wear out there is really nothing to use in their place

When I was searching for some, for a Rogers Cadet III restoration 3 years ago I found that they were "rare as rocking horse manure" and worth a LOT of money. I eventually tracked down 3 ONLY in the UK and paid 20 UK pounds each for them.

For a new design, may I suggest that you sell the ECC808 to restorers of vintage equipment and thereby raise cash enough to buy parts which WILL still be available in 5 to 10 years. It is my view that this would be doing yourself and others (who are desparate for ECC808 for restoration jobs) a favour.

The little "stashes" of ECC808 like your own are all the ECC808 that are still available, anywhere.

I know EC8010 was doing a Rogers restoration recently and he would echo my sentiments.

Regardless of above, they are your tubes and they ARE something special so feel free to disregard this advise.

Cheers,
Ian
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Old 6th September 2005, 06:31 AM   #6
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Quote:
they have a mu of 150 and so there simply is'nt anything that can be substituted for them (well not easily)
Really? The data sheet above says mu=100, gm=1.6mA/V at 1.2mA. Sounds pretty close to a 12AX7 to me! Clearly, these are not the same tubes, but with minor accommodations to pin out and heater supply, a 12AX7 and an ECC808 could probably be reasonable substitutes for one another. What am I missing?

But I agree with the advice to sell them and use the proceeds to buy mainstream tubes, and then to take the wife out to a nice dinner on what’s left over.
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Old 6th September 2005, 06:38 AM   #7
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Brian,
You are correct - the Telefunken data sheet does say mu of 100. The Brimar datasheet however does say mu of 150. So designs using the Telefunken tubes could be converted to 12AX7 with a socket rewire as you say. Some of the Rogers stuff may be more problematical as they would have used Brimar tubes for sure.
Cheers,
Ian
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Old 6th September 2005, 07:29 AM   #8
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Gingertube what you are talking about is the ECC807, not ECC808. The ECC808 is a low-noise version of the ECC83, but with a different pin-out ; the ECC807 is a different beast with its own characteristics (a mu of 150, as you say) and very hard to find. Brimar did make it and also called it the 13D7.
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Old 6th September 2005, 07:38 AM   #9
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G'day "barretter",

Duh,
Is my face RED?
You are absolutely correct - well spotted, I was talking about the ECC807. So my advise above is irrelevant to the discussion.

Maybe I should stick to talking about the cricket - on 2nd thoughts maybe NOT!!!

Cheers from Oz,
Ian
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Old 6th September 2005, 08:17 AM   #10
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Easy mistake to make, Gingertube. I'm looking forward to Thursday : the last three Test matches are the best cricket I've ever watched.
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