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TT 139VA enough to 2x5881 tubes?

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Offline Leadman

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TT 139VA enough to 2x5881 tubes?
« am: 21.12.2024 16:01 »
Hello, I want to build an amplifier with 3 12ax7 preamp tubes and 2 5881 power tubes. I want the power to be higher than a Deluxe reverb, something between 30w-40w.

My questions are regarding the TT135VA toroidal power transformer. Would it be enough for this type of circuit?

The transformer has 2 300-0 windings at 150ma, each of these windings would give me a current intensity when rectified of about 110ma. By joining them I could have a 300-0-300 winding at about 220ma, this should be enough for the design I am looking for.

Are my calculations correct? or by joining the two 300-0 windings of 150ma, I would only get an extra winding of 300-0-300 at 150ma.

Thanks in advance for your help.

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Offline Helmholtz

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Re: TT 139VA enough to 2x5881 tubes?
« Antwort #1 am: 21.12.2024 18:38 »
What rectifier circuit and type are you going to use?

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Offline Leadman

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Re: TT 139VA enough to 2x5881 tubes?
« Antwort #2 am: Heute um 10:44 Vormittag »
Bridge Diode recitifer, with Capacitor Resistor smoothing:

100uf-220R-50uf-22k-22uf-15k-22uf