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Old 17th April 2005, 12:01 PM   #1
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Arrow Elektor ECL86 RIAA Preamp

Hi,

I am planning to build this RIAA preamp with ECL86 from the Elektor magazine, but without the input transformer. What is your opinion about the circuit? Have some of you already tried it?

Cheers,

Manuel
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Old 17th April 2005, 12:52 PM   #2
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Lots of similar and better circuits all over the net . I would rather avoid this one as the designer was clearly not into serious hifi - just have a look at the silly coulpling cap values - and elcos!

And, ha, ha, a coupling cap after the transformer. What a moron!
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Old 17th April 2005, 01:58 PM   #3
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Mmmm Yes, the input cap is weird.
I've already bought all the components. ¿any suggestion about how to re-use them?
Thanks
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Old 18th April 2005, 01:05 AM   #4
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Default ECL86 RIAA Preamp

Quote:
Originally posted by analog_sa
Lots of similar and better circuits all over the net . I would rather avoid this one as the designer was clearly not into serious hifi - just have a look at the silly coulpling cap values - and elcos!

And, ha, ha, a coupling cap after the transformer. What a moron!

Can you share some links to these ECL86 RIAA preamps.

Regards,
Gio.
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Old 18th April 2005, 05:25 PM   #5
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¿What is your opinion about this ones? They all use ECC83

Dynaco:
http://www.bonavolta.ch/hobby/en/audio/dyn_upas.htm
http://www.bonavolta.ch/hobby/en/audio/dyn_pas2.htm

RCA:
http://www.bonavolta.ch/hobby/en/audio/rca.htm

Ohashi (1-1/2 ECC83):
http://www.bonavolta.ch/hobby/en/audio/ohashi.htm

Zur Linde SRPP output (1-1/2 ECC83):
http://www.bonavolta.ch/hobby/en/audio/lindesrp.htm
(some values of the components maybe hard to find)

Cheers

Manuel
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Old 18th April 2005, 05:28 PM   #6
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Quote:
Can you share some links to these ECL86 RIAA preamps
No, i have never noticed ECL86 preamps and see little reason one should force this tube for phono.
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Old 18th April 2005, 05:38 PM   #7
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ECC83 is probably not the best sounding tube but is widely available and easy to use. I still have warm memories of Marantz 7C phono section and the link to 'Ohashi' or AR SP-3 presents a very similar circuit. Thanks to the CF and NFB output impedance is low and one can feed a pot/power amp directly.

EAR834 seems like another very good choice
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Old 18th April 2005, 06:22 PM   #8
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Quote:
Originally posted by pingfloid
¿What is your opinion about this ones? They all use ECC83

RCA:
http://www.bonavolta.ch/hobby/en/audio/rca.htm


I have the iron and tubes for the RCA preamp and plan to try it out eventually. I think there is an error in the schematic in your link. Compare the capacitors marked * in your link with the link I have posted below.

See

http://www.diyaudio.com/forums/showt...366#post526366

for a scan of the schematic from the RCA book which shows a different value for the np capacitors.

Good luck and let us know how you make out.
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Old 19th April 2005, 02:36 AM   #9
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Quote:
Originally posted by GG
the RCA preamp
The as built map for Chris' version....

dave
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Old 19th April 2005, 02:37 AM   #10
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and the power supply (severe overkill on this)
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