[TechAssist] Re: Antique tube # 80 or 5X3
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 30 Jun 2005 11:36:08 -0400
Yes, there were plug-in replacements for those tubes that contained a
resistor. The way the power supplies were designed, the DC voltage was much
higher if the tubes were not drawing current and the resistor slowed down
the DC voltage buildup a little to give the filaments a chance to warm up.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, June 29, 2005 4:22 PM
Subject: [TechAssist] Re: Antique tube # 80 or 5X3
> 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
> > > >
> > >
> > >------------------------------------------------------------------
> > ---------
> > --
> > > >This Email List is Public. Remove: http://www.tech-
> > assist.org/remove.htm> >Set Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > >Lost Password: http://www.tech-assist.org and select "Login
> > Problems?".> >Email Archives:
> > //www.freelists.org/archives/techassist/> >
> > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > No virus found in this outgoing message.
> > > Checked by AVG Anti-Virus.
> > > Version: 7.0.323 / Virus Database: 267.8.5/32 - Release Date:
> > 6/27/05>
> > > -----------------------------------------------------------------
> > ---------
> > ---
> > > This Email List is Public. Remove: http://www.tech-
> > assist.org/remove.htm> Set Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > Lost Password: http://www.tech-assist.org and select "Login
> > Problems?".> Email Archives:
> > //www.freelists.org/archives/techassist/
> > -------------------------------------------------------------------
> > ----------
> > This Email List is Public. Remove: http://www.tech-
> > assist.org/remove.htmSet Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacationLost
> Password: http://www.tech-assist.org and select "Login Problems?".
> > Email Archives: //www.freelists.org/archives/techassist/
> >
> --------------------------------------------------------------------------
---
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation
mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Email Archives: //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
