cool Pete Old TV Man <mebonnell@xxxxxxxxx> wrote: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 ---------------------------------------------- ---------------------------------------------- ----------------------------------------------------------------------------- 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/ Peter Neal Neal Electronics 1905 E. Wm.Cannon Austin,TX 78756 ----------------------------------------------------------------------------- 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/