AD30 Plate Voltage

Orange Amps Technical Q&A's

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Farrerdale Records
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Re: AD30 Plate Voltage

Post by Farrerdale Records » Sun May 27, 2018 6:27 pm

What about dropping the B+ voltage by using a 5Y3 rectifier?

fiveightandten
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Re: AD30 Plate Voltage

Post by fiveightandten » Tue May 29, 2018 2:22 am

Jondog wrote:
Sun May 27, 2018 1:40 am
fiveightandten wrote:
Sat May 26, 2018 8:45 pm
Jondog wrote:
Fri May 25, 2018 1:01 am
You could pull two tubes. Just match tbe impedance.
What about the remaining tubes running off 150 ohm cathode resistors as singles (doubling the dissipation)?
I put could in italics because it’ll work, but best with mods to the bias as well. I was partly thinking of the Dual Terror, although it’s bias resistors (150ohm/two tubes), but it is wired differently. One resistor/two tubes in push pull configuration. Best to do it right. I would mod the amp if I were to do that.
Agreed. I was referring to the "just match the impedance" comment. As you clarified, there's a lot more to it than that. If I could just yank 2 tubes and plug into a different OT tap on my AD30, I would've done it a long time ago! :mrgreen:
Farrerdale Records wrote:
Sun May 27, 2018 6:27 pm
What about dropping the B+ voltage by using a 5Y3 rectifier?
A 5Y3 can't reliably keep up with the current demands of a 4 x EL-84 amp. It can supply roughly half the current of a 5AR4. IIRC, it would be right at the upper limit of the tube to run it in an AD30. I doubt you'd like the sound of lower voltage in an AD30. I know I don't. The pre-amp gets much too gainy for my tastes, personally.
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