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6P13S SE cheap amp: improvement suggestions
6P13S SE cheap amp: improvement suggestions
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Old 21st November 2020, 09:37 PM   #51
zintolo is offline zintolo  Italy
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Join Date: Sep 2012
Update on this topic:
I've receipt the kit including tubes and transformers.
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Old 21st November 2020, 11:00 PM   #52
zintolo is offline zintolo  Italy
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Join Date: Sep 2012
Here the datasheet of the preamp tube: https://frank.pocnet.net/sheets/095/6/6N2.pdf

Looking at the curves of the output tube ( https://frank.pocnet.net/sheets/095/6/6P13P.pdf ) am I correct saying that I need around 60V on screens to hit g1=0 with a=50V with Ra=10k4 and working point at 300V 40mA?

I would like to connect a 8 Ohm speaker to the 4 Ohm tap, in order to get around 3 Wrms that should be handled by those small transformers.

A bit more can be obtained by working at 250V and 50mA with Ra=5k2 and hitting g1=0 at 50V and around 90 mA, but I think the output transformers would suffer.

In any case, the suggested voltage for the secondary voltage of the power supply seems a bit high to me (230 to 310 Vac means 310 to 420Vdc).
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