[TechAssist] Re: R: Antique tube # 80 or 5X3
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 29 Jun 2005 00:31:22 +0000
Some one might check me on this but you would want to hook the diodes in the
same way the tube is Cathode to cathode, anode to plate as the diode
nominclature terms were derived from tubes. Type 80 appears to be availble
on the web... Some sites claim that you don't want to apply the HV untill
all of the filiments are warm (they sugest installing a switch) I suppose
you could install a posistor to limit current during warm up, not sure if it
is really necessary though.
Peter Oliver
Tucson Radio TV
From: mebonnell@xxxxxxxxx (Old TV Man)
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] R: Antique tube # 80 or 5X3
Date: Tue, 28 Jun 2005 18:32:25 -0500
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=A0to:
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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