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50EH5 Tranformer Question
50EH5 Tranformer Question
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Old 13th August 2019, 06:47 PM   #1
nikon f is offline nikon f  United States
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Default 50EH5 Tranformer Question

I am going to build a 50EH5 amp from this site: http://www.t-linespeakers.org/tubes/SEP_50EH5.html, I will be using isolation transformers. What primary ohm rating should I use for the output transformers?
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Old 13th August 2019, 07:47 PM   #2
tikiroo is offline tikiroo  New Zealand
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If you follow one of the links on that site it says 2.5-3k primary.
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Old 13th August 2019, 08:31 PM   #3
smoking-amp is offline smoking-amp  United States
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The tube datasheet gives an example 1 tube class A amp. 3000 Ohm OT.
However, that will give you a very poor speaker damping factor in pentode mode with no N Fdbk.

https://frank.pocnet.net/sheets/093/5/50EH5.pdf
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Old 15th August 2019, 04:16 AM   #4
PRR is offline PRR  United States
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Look-up your tube at Frank's.... the factory datasheets tell you good operating conditions.
electron Tube Data sheets - Search
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