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Date: Sat, 25 Apr 2020 00:01:25 -0700
Subject: Re: [EE] Seeking audio relay advice
Thread-Topic: [EE] Seeking audio relay advice
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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 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--
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