[TechAssist] Re: Antique tube # 80 or 5X3
- From: "majorthom@xxxxxxxxxxxxx" <majorthom@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 28 Jun 2005 16:08:19 -0700 (PDT)
Youll definitely have higher B+,a lot higher.Silicon diode drop < 1V Type 80 ,i
dunno 20 -30
Forgot,anywaay Type 80 has 5V fil and 2 Amp fil curr.
Pete
becyn <becyn@xxxxxxxxxx> wrote:
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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Peter Neal
Neal Electronics
1905 E. Wm.Cannon
Austin,TX 78756
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