From: Mike Rigby-Jones <pic.developer@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Sat, 25 Apr 2020 00:52:17 -0700
Subject: Re: [EE] Seeking audio relay advice
Thread-Topic: [EE] Seeking audio relay advice
Thread-Index: AdYa175BoIN4x/lKRLaPpmXgnjVe2A==
Message-ID:
 <CAJQfOjuMK=tR-GyHoEGXLQL6vu=6A3TSTrhK-V4+yLFtSqPt2A@mail.gmail.com>
References:
 <BYAPR02MB40557004C1D52433FE3C71DDDCD10@BYAPR02MB4055.namprd02.prod.outlook.com>
In-Reply-To:
 <BYAPR02MB40557004C1D52433FE3C71DDDCD10@BYAPR02MB4055.namprd02.prod.outlook.com>
Reply-To: Microcontroller discussion list - Public. <piclist@mit.edu>
Accept-Language: en-US
X-MS-Exchange-Organization-SenderIdResult: Pass
X-MS-Exchange-Organization-PRD: mit.edu
X-MS-TNEF-Correlator:
received-spf: Pass (protection.outlook.com: domain of gmail.com designates
	209.85.210.48 as permitted sender) receiver=protection.outlook.com;
	client-ip=209.85.210.48; helo=mail-ot1-f48.google.com;
dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com;
 s=20161025;
	h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
 	bh=cWAgtzyHPrbHOCiOuMTJPtsTfCg53Bfj7rO7gwtdCg0=;
	b=ZIxaAbRObTfmTNhoELZYJz/ixtn54CaPX+hpn4mspB2fk+udXpkkXCBOpoypEsJSyl
	ZxtN9d1TLZRYVg0ZqwsDPXF0/cyb/oXiUgu8Bjw+bgmNVGwUvX9hz78NLgDB5ZtqGYcR
	kRjKBvz/KaK+zRlJW1pRvupjEi7lUy1AIBevHCHlVosSv+f0hZgNZnIsCyMjJfk9BOFN
	m9fUGGlCz1u95rYK64k/E4lckcRI1XXOdp+oCB/UYHqlgnIVx6bfGFUzmjw6CdCf6Yn3
	C5xs4NC4V2I8L1Jtpvyf6keJnIwbgjRfP2G85YxVEtxdxvXnP85vRpXp7tnYKYJj8UOJ	mfzQ==
authentication-results: spf=pass (sender IP is 209.85.210.48)
	smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified)
	header.d=gmail.com;mit.edu; dmarc=pass action=none
	header.from=gmail.com;compauth=pass reason=100
errors-to: piclist-bounces@mit.edu
list-id: "Microcontroller discussion list - Public." <piclist.mit.edu>
list-post: <mailto:piclist@mit.edu>
x-beenthere: piclist@mit.edu
x-mailman-version: 2.1.6
x-received: by 2002:aca:fd93:: with SMTP id
 b141mr9936158oii.177.1587801149785;	Sat, 25 Apr 2020 00:52:29 -0700 (PDT)
x-topics: [EE]
x-content-filtered-by: Mailman/MimeDel 2.1.6
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

Look for signal relays designed for "high contact stability" e.g. Axicom
5-1462039-5. These will have gold plated contacts, often bifurcated, which
are optimised for reliably switching very small voltages and currents.

 Mike

On Sat, 25 Apr 2020, 03:32 Bob Blick, <bobblick@outlook.com> wrote:

> Backstory: ten years ago I was given a Phase Linear 3000 Series 2
> preamplifier. The friend who gave it to me said it had relay problems.
> Recently I acquired a matching power amplifier, and I'd like to get them
> both running, because they look awesome together.
>
> The preamp has no audio switches. All audio switching is done with 13
> relays, DPDT, 24VDC, in DIP package.  The relays it has were made by OMRO=
N,
> with clear plastic lids. Evidently there were a lot of problems, because =
I
> have a factory service bulletin that says to replace them with Aromat
> HB2E-DC24V relays, which are nitrogen filled and hermetically sealed.
> Unfortunately after Aromat was absorbed by Panasonic they were discontinu=
ed
> shortly afterward. And the pinout is not standard.
>
> Looking at various forums, evidently the Aromat/Panasonic relays were
> better, but not perfect either. There are people on eBay that have the
> Panasonic branded relays for sale. They appear to be new old stock, about
> $15 each.
>
> So my choice appears to be either put in $200 worth of NOS relays that ma=
y
> not be perfect, or make a bunch of adapter PC boards to adapt a different
> set of relays to fit.
>
> My question for y'all is this: Is there a 24VDC DPDT DIP relay that
> actually works well for audio? If so, it might be worth the trouble to
> adapt them to fit. Otherwise, I'll just bite the bullet and take the chan=
ce
> on some 20-year old new relays that might give me problems in just a few
> years(or immediately).
>
> Not interested in analog switches, I'd like this preamplifier to retain
> its original sonic character.
>
> Thanks in advance! Bob--
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.