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Old 26th October 2009, 09:04 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default Best Audio Relays

Any views on the BEST audio relays for line level signal switching?

Switches are not an option (some may say unfortunately)

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Old 26th October 2009, 10:33 AM   #2
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Hi,

I've had good luck with telecom signal relays as they're designed for low levels of AC (including audio) and lots of on/off cycling.

Anything higher quality I think would have to go in the mercury wetted category.

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Old 26th October 2009, 11:41 AM   #3
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Hi.

These work very well, almost not there sound wise, but are not cheap.

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Old 26th October 2009, 03:19 PM   #4
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A decade ago there was a listening test in Klang&Ton, as far as I remember they favored the mercury wetted stuff.
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Old 26th October 2009, 03:48 PM   #5
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Hi.

Mercury wetted relays are a non-starter for europeen comercial electronics as they are not ROHS complient.

Chris
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Old 26th October 2009, 04:10 PM   #6
Tolu is offline Tolu  Germany
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@Bonsai

Try it by yourself will be the best way! Don't give too much on tests if you don't know the testing person! I know the K&T listening test. This test is stone age (1993) and most parts aren't available anymore.

I would propose that you buy two types of gold plated signal relays (e.g. Takamisawa, Omron) and one or two reed relays (e.g. Meder or Coto) and then try it out!

Perhaps if you have golden ears you can test it in active and passive mode and hear if there is any difference.

And... tell us your results!
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Old 26th October 2009, 04:11 PM   #7
EUVL is offline EUVL  Europe
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> Mercury wetted relays are a non-starter for europeen comercial electronics as they are not ROHS complient.

I have had no problems imported them from USA for my own use in small quantities (50 pieces).
http://www.electronicsurplus.com/ccp...11p02-7596.htm

They were then 6USD per piece.

The EU is just pushing people to use energy saving light bulbs which, guess what, contains mercury; more than you can find in the relay.


Patrick


PS There are good scientific reasons why mercury wetted relays are good for low voltage high impedance connections.
Ask some eletro-mechanical engineer about contact resistance of dry relays at currents below 50µA.
Check out who use them in industrial measurement equipment products.

Last edited by EUVL; 26th October 2009 at 04:20 PM.
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Old 26th October 2009, 04:16 PM   #8
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Quote:
Originally Posted by Bonsai View Post
Any views on the BEST audio relays for line level signal switching?

Switches are not an option (some may say unfortunately)

I have heard about this one: 50GB5N

Photo (scoll down):
Eingangsstufe zum Verstärker mit der 6C33C-B
Supplier:
Parts Demo Step 2 - AirParts.com

But I haven't tested
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Old 26th October 2009, 04:51 PM   #9
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Quote:
Originally Posted by Tolu View Post

you can test it in active and passive mode and hear if there is any difference.


I have tested this and the difference was surprisingly large. Ended up using a micro so the signal passes only through non-active relays. Using latching relays will probably have the same result.
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Old 26th October 2009, 04:55 PM   #10
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Quote:
Originally Posted by tiefbassuebertr View Post
http://www.jogis-roehrenbude.de/Verstaerker/6C33C-VV.htm
Those are C.P. Clare mercury wetted reed relays, used to be manufactured in Tongeren, Belgium.
C.P. Clare reed relays were used in the top of the range NAIM preamp.
The currently hot steam debated Densen also had 4-leg relays by C.P. Clare in their preamps.
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