[TechAssist] Re: Antique tube # 80 or 5X3
- From: tjanphyl@xxxxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 29 Jun 2005 16:22:25 -0400
Fellas:
I am (just) old enough to remember these "upgrades" from VT to solid
state diodes in these radios. The solid state rectifiers were infact
too efficient, and would produce excess B+. I remember being told to
use a "limiting resistor" in series with the new rectifier solid
state diode to compensate.I think they were fairly low ohms. Maybe
more to control inrush current at start.Going from memory here.
Phil Bader
----- Original Message -----
From: J Silverman <greentron@xxxxxxx>
Date: Wednesday, June 29, 2005 2:39 pm
Subject: [TechAssist] Re: Antique tube # 80 or 5X3
> 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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