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 Post subject: Rectifier suggestion
PostPosted: Apr Fri 27, 2012 9:57 pm 
Member

Joined: Mar Tue 20, 2012 2:58 am
Posts: 68
Location: Princeton, NJ
Model: Wega 110

I want to replace the EZ 80 tube with a rectifier.
How can this be done ?
I have a schematic but the forum does not allow me to attach in pdf fromat .

Thanks in advance


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 Post subject: Re: Rectifier suggestion
PostPosted: Apr Fri 27, 2012 11:27 pm 
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Joined: Aug Thu 27, 2009 7:47 am
Posts: 1835
Location: Seattle
Pair of 1N4007 diodes. Take the leads from pins 1 and 7 of the rectifier socket (plates) and move them to the anode (non-band) end, one on each diode. The other end of the diodes - the cathode/banded end - should join together, and that junction point is where your unfiltered B+ will come from. This is Pin 3 on the socket. From there, run over to your first filter.

You may also need a dropping resistor...300 Ohm 5W, between the rectifier output and the first filter cap.

http://www.radiomuseum.org/tubes/tube_ez80.html


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 Post subject: Re: Rectifier suggestion
PostPosted: Apr Sat 28, 2012 5:34 am 
Member

Joined: Mar Tue 20, 2012 2:58 am
Posts: 68
Location: Princeton, NJ
[quote="jkoebel"]You may also need a dropping resistor...300 Ohm 5W, between the rectifier output and the first filter cap. [/]quote

What is the purpuse of the new dropping resister. I already have a 50 ohm 12 watt resister connected to pin 3.

Thanks
M Khan


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 Post subject: Re: Rectifier suggestion
PostPosted: Apr Sat 28, 2012 6:49 am 
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Joined: Apr Tue 24, 2012 2:22 pm
Posts: 38
when you change from a Tube rectifier, to silicon, the silicon is more efficient, so it drops only 1.5 volts while the tube rectifier could drop up to 30v so you may need to add a resistor to bring down your b+

add in the fact that older radios were made for 108 - 115 v and most power is not 120 - 125...


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 Post subject: Re: Rectifier suggestion
PostPosted: May Wed 02, 2012 1:55 am 
Member

Joined: Mar Tue 20, 2012 2:58 am
Posts: 68
Location: Princeton, NJ
Hi:
The diode jig worked just fine.
I am learning fast and every step gives me joy.

Thanks all.
M Khan


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