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 Post subject: Dual Rectifiers wired in Parallel???
PostPosted: Mar Mon 20, 2017 10:12 pm 
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Joined: Feb Fri 03, 2017 5:28 am
Posts: 38
I am playing around with some 866a rectifier tubes. I would like to run a pair of them in full wave mode. I am wondering if I can wire the 2.5V filaments in series with a 5V source (I don't have a 2.5V transformer).
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Do you see any problems with doing this?

Thanks,


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 Post subject: Re: Dual Rectifiers wired in Parallel???
PostPosted: Mar Mon 20, 2017 11:53 pm 
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Joined: Jan Fri 06, 2012 8:47 pm
Posts: 5693
As long as your filament transformer can support 5V at 5 A I don't see any obvious problem. Of course I am not an expert on 866 Mercury Vapor Rectifiers. The filament transformer also needs to be rated for the HV insulation requirements as well.

Curtis Eickerman

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 Post subject: Re: Dual Rectifiers wired in Parallel???
PostPosted: Mar Wed 22, 2017 7:45 pm 
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Joined: Mar Sat 28, 2009 8:27 pm
Posts: 660
Location: Georgia
I agree with Curtis in that your 5 volt winding should be rated for current and insulation. Also, be sure to use a choke input as opposed to a capacitor input filter. The 866's are excellent and will yield good regulation and life. I am FCC licensed and service a few small town AM stations that have 866's in some of their modulators, many of them have been in service for years.
I might add that most of them are fan cooled when in commercial service.


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