Determining output transformer load (submini amp)

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soma_hero
Posts: 232
Joined: Wed Jul 30, 2008 6:27 pm

Determining output transformer load (submini amp)

Post by soma_hero »

I'm almost finished with a submini amp using 5899 output tubes. These were designed for RF amps but they should work fine for AF. Anyway, they have a plate resistance of 260k, which is pretty high.

How do I figure out what to use for a primary on an output transformer in push-pull? Some datasheets say plate to plate load, this one doesn't. Is it just plate resistance/number of tubes in push pull? In this case that would be 130k?

Thanks

http://tubedata.itchurch.org/sheets/127/5/5899.pdf
Ripthorn
Posts: 93
Joined: Sat Jan 31, 2009 5:24 pm
Location: Syracuse, NY

Re: Determining output transformer load (submini amp)

Post by Ripthorn »

If I understand right, you don't want plate resistance, you want load resistance. You can roughly double it (though I think it is usually a little less than double) for push-pull. I didn't see load resistance on any data sheets I looked up for it, though, so I can't be of more help in your specific case.
Exact science is not an exact science
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