[TechAssist] Re: Antique tube # 80 or 5X3
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 Jun 2005 14:39:17 -0400
That tube was used in circuits of 150 ma max, for an average of 75 ma per
plate. Being a radio, I would think a 1000 volt diode would be more than
adequate.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "becyn" <becyn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, June 28, 2005 6:58 PM
Subject: [TechAssist] Re: Antique tube # 80 or 5X3
> Hi Max,
>
> I don't know the specs for the NTE 125, but in an application like
> that, use TWO diodes good for 1 amp or better at 1000PIV in series
> from each plate to cathode and it will work fine. Some of those old sets
> had very high B+, up to 550V .
>
> To keep the authentic look, I'd leave the old tube in it's socket and
> wire the
> diodes under the chassis. Since these oldies didn't believe in fuses, I
> like to add
> 500ma pico fuses to protect the transformer against a dead shorted
> rectifier diode.
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh N.Y. 12550
>
> "If it doesn't play...
> CALL MCVEY !!!!!!"
> Factory authorized
> service for over 20
> major brands.
> 845 561 8383
> (Last of the Mohegans)
>
> Old TV Man wrote:
>
> >I have an old crosley radio that uses a #80 tube as a rectifier. Since I
> >can't find one is it possible I could take a 4 pin socket and make a
> >rectifier with some NTE 125's.
> >Maybe some of you educated engineers can help on this.
> >
> >Max Bonnell
> >Bonnell TV
> >Robinson, IL
> >
>
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