From: Richard Prosser <rhprosser@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sat, 25 Apr 2020 00:07:46 -0700
Subject: Re: [EE] Seeking audio relay advice
Thread-Topic: [EE] Seeking audio relay advice
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Reed Relays?
RP

On Sat, 25 Apr 2020 at 19:03, David VanHorn <microbrix@gmail.com> wrote:

> My first thought is mercury wetted relays, but I don't know where you'd
> find them these days.  Anything else could suffer from lack of sufficient
> wetting current.
>
> On Fri, Apr 24, 2020 at 8:32 PM 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 the=
m
> > 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
> OMRON,
> > with clear plastic lids. Evidently there were a lot of problems, becaus=
e
> 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
> discontinued
> > 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, abo=
ut
> > $15 each.
> >
> > So my choice appears to be either put in $200 worth of NOS relays that
> may
> > not be perfect, or make a bunch of adapter PC boards to adapt a differe=
nt
> > 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
> chance
> > on some 20-year old new relays that might give me problems in just a fe=
w
> > years(or immediately).
> >
> > Not interested in analog switches, I'd like this preamplifier to retain
> > its original sonic character.
> >
> > Thanks in advance! Bob--
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> >
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