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 Post subject: NOS Selenium Rectifiers
PostPosted: Jun Mon 14, 2021 7:11 pm 
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Came across two or 3 boxes --- that is 24"x18"x8" boxes, of NIB Seleniums. All makes and types. Single to quad section. 1/2 to 3”.

I cannot for the life of me come up with a justification to keep them. Can anyone? Maybe group them into piles of 10 different ones and offer them as collectibles? Make e the Guinness record book for tallest pile? What to do….

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Last edited by Barry H Bennett on Jun Mon 14, 2021 10:36 pm, edited 1 time in total.

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Mon 14, 2021 10:01 pm 
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If they haven't been used you could save then and use them in an old radio that has one that's going bad to look original.

Freeman


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Mon 14, 2021 10:14 pm 
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Sell them to one of these guys:


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Mon 14, 2021 10:38 pm 
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I edited my initial post... these boxes are 24x18x6 .... full

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 12:44 am 
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Holy Moly! Just sell on PTOTP for a dollar each. They might fly away at that price. I know I would buy five, at least.

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 12:56 am 
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Mr. Highlander wrote:
Holy Moly! Just sell on PTOTP for a dollar each. They might fly away at that price. I know I would buy five, at least.

10 minimum lol

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 2:07 am 
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I would be interested in some of the smaller ones (radio size). Will send a PM tonight.

DM


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 3:08 am 
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You could mount a few on octal bases for tube substitutes. With the right sales pitch, they would sell.
I suggest you name them Soul-anyum Memphis Mojo makrers. :D

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 11:28 am 
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westcoastjohn wrote:
You could mount a few on octal bases for tube substitutes. With the right sales pitch, they would sell.
I suggest you name them Soul-anyum Memphis Mojo makrers. :D

Excellent idea. Name that part contest:

Sell-Anyofem-Rectifiers

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 2:31 pm 
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Could you imagine buying a radio and find a selenium sitting in top of the chassis? That would be a first.

Freeman


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 2:52 pm 
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Location: Santa Rosa, CA
Quote:
If they haven't been used you could save then and use them in an old radio that has one that's going bad to look original.


Unfortunately, selenium rectifiers age whether you use them or not. Actually, running them in a radio probably drives off moisture. These devices were not well sealed; usually they were sealed with varnish or paint. You might get lucky, but I would test them before using them.

Rich


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 4:01 pm 
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Quote:
but I would test them before using them.

::::::::packing them all up to send to Rich for testing.................... :mrgreen:

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 4:34 pm 
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If you pay the postage....

I use the Curt Reed (and others) method. Toss the rectifier into a metal trash can. If you hear a loud "clunk!" sound... the rectifier is bad.

Do not leave the selenium rectifier in the trash can as most communities would regard this as hazardous waste.

Rich

https://worldradiohistory.com/BOOKSHELF-ARH/Technology/Federal-Selenium-Rectifier-2nd-1953.pdf

See pg. 7 about Cadmium content. See pg. 74 about encapsulating selenium rectifiers to protect against "...condensation... fungus... and other destructive elements..."

If you like them and they work... enjoy them!


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Tue 15, 2021 9:04 pm 
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Freeman wrote:
Could you imagine buying a radio and find a selenium sitting in top of the chassis? That would be a first.

Freeman
Zenith C845 and H845 have them outboard of the chassis, but have the power cord interlock on the back. This one dates from 1959, is good.

I am half serious about using high voltage selenium rectifiers in guitar amps like the Fender Champ. The voltage drop is much less than that for a 5Y3, so the amp will sound louder with a brighter tone guaranteed. The terminals will need to be shock proofed with some tubing.
You need a popular guitar hero to endorse them, and sell them for say $39.95. 8)


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Wed 16, 2021 3:03 am 
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Location: Northeast Florida
When I was first starting out in radio as a teen, I came across one for the first time. I had no idea what it was or what it did, but I sure found out fast that the plates have voltage on 'em...

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Wed 16, 2021 5:14 am 
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Greetings to Barry and the Forum:

I saw a thread earlier where someone was showing off a wristwatch with a nixie readout. So, since anachronism seems to be the in thing right now, I would enjoy seeing a project with all surface mount parts on a PC board.... with a selenium stack included as part of the on-board power supply. Please be sure to post a picture when you get it done! :D

Regards,

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Wed 16, 2021 12:00 pm 
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.......I haven't been able to locate a surface mount selenium stack yet ....... :mrgreen:

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Wed 16, 2021 8:08 pm 
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Selenium rectifiers are know to age badly and their characteristics change all along their useful life, increasing forward drop and reverse leakage current, up to the point where there are no longer usable for the application and need to be replaced. New selenium rectifiers also have an initial break-in time and some old gear had a compensating pot for re-adjusting the voltage during aging.

I have no datas about the aging or deterioration (shelf life) of N.O.S (never in service) selenium rectifiers. The few I have tested were still OK but like for any old (50-70 years) electronic part some deterioration process could be expected, which is also related to the manufacturer, quality of materials used, processing, storage conditions, etc. Too Many unknows...

Another (important) issue is that selenium rectifiers can NOT be tested with your usual DMM/Diode tester, results will be inconsistent and unreliable. Selenium rectifiers must be tested under load at the specified voltage, there were some specific selenium testers made for this purpose (see pictures below).

The (obvious) conclusion is that you can't sell N.O.S selenium rectifiers with any kind of warranty or return privileges. This must be clearly stated in your selling ads.

Another (secondary) issue is that selenium rectifiers could emit highly toxic smokes when overloaded (the well know rotten egg smell).

After reading all the above is there still ANYBODY here wanting to use these old relics ?


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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Wed 16, 2021 10:42 pm 
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Quote:
After reading all the above is there still ANYBODY here wanting to use these old relics ?

We've come full circle... that was more or less my opening statement :-D

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 Post subject: Re: NOS Selenium Rectifiers
PostPosted: Jun Thu 17, 2021 12:44 am 
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Barry H Bennett wrote:
Quote:
After reading all the above is there still ANYBODY here wanting to use these old relics ?

We've come full circle... that was more or less my opening statement :-D


Considering the ever increasing price of N.O.S selenium rectifiers there should be definitely some users of these oldies...
And the day (sooner or later) when audiophools will (re)discover the outstanding sonic merits and liquid 3-dimensional soundstage of selenium rectifiers prices will skyrocket.
Doesn't this ring your "speculating bell" ? :lol:
Stock them and some day in the future you'll make a small fortune of them :D ... or not ! :(


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