[TechAssist] Re: Antique tube # 80 or 5X3
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 Jun 2005 07:12:26 -0400
That's good, because I can't remember where I put my old tubes.
My mind takes to where they WERE for 25 years but I moved a bunch of stuff a
couple years ago.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "Old TV Man" <mebonnell@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, June 28, 2005 9:30 PM
Subject: [TechAssist] Re: Antique tube # 80 or 5X3
> Thanks to everyone who helped on this.
> I found a #80 tube.
>
> Max Bonnell
> Bonnell TV
> Robinson, IL
>
> Sender: techassist-bounce@xxxxxxxxxxxxx From:
> mebonnell@xxxxxxxxx(Old=A0TV=A0Man) Date: Tue, Jun 28, 2005, 6:32pm To:
> techassist@xxxxxxxxxxxxx Subject: [TechAssist] R: Antique tube # 80 or
> 5X3 Reply=A0to: techassist@xxxxxxxxxxxxx
>
> Thanks Jim. NTE 125 is 1000 PRV-2.5 amps. I have an old NRI schematic
> (Crosley) that shows the 2 large pins as filaments and the 2 small pins
> as plates. Shows B+ as 280 volts. So where you say plate to cathode I
> would think the neg side would go to the filaments and cathode to the
> plates.
> I agree about the authenic look.
>
> Max Bonnell
> Bonnell TV
> Robinson, IL
>
> Sender: techassist-bounce@xxxxxxxxxxxxx From: becyn@xxxxxxxxxx(becyn)
> Date: Tue, Jun 28, 2005, 6:58pm (CDT+1) To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Antique tube # 80 or 5X3 Reply=3DA0to:
> techassist@xxxxxxxxxxxxx
>
> 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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