Burning Amplifier BA-1 - Page 25

Zen Mod · 21st October 2011, 04:53 AM

just go for it

amplifiers want to be made !

AndrewT · 21st October 2011, 09:35 AM

Quote:

Originally Posted by timbarnes

I guess I'd need to run the transformer with primaries in series on the 100V taps: this should give me almost 22V peak to peak.

with the primaries properly wired up for the voltage supply you have the transformer is a 550VA.

If you wire the two 100Vac primaries in series and connect them to a 115Vac supply you reduce the transformer to ~300VA.

DON'T.

timbarnes · 21st October 2011, 07:37 PM

Quote:

Originally Posted by AndrewT

with the primaries properly wired up for the voltage supply you have the transformer is a 550VA.

If you wire the two 100Vac primaries in series and connect them to a 115Vac supply you reduce the transformer to ~300VA.

DON'T.

Fair point. I was applying Nelson's advice to get the right voltage without thinking about the power capacity of the primary windings. I guess I could use it that way with fewer transistors per side...maybe three or four?

Perhaps an alternative would be to series regulate it down to the required voltage? It would require a pretty hefty series transistor, I guess.

timbarnes · 24th October 2011, 02:04 AM

I'm going to keep my BA-3 with its own power supply, so I'm only concerned about power to the output stage and bias boards.

I want to use my 27+27V transformer, which yields about 38V DC.

It seems that the extra voltage would not burn the power transistors, but I'm not so sure about the bias boards.

Any thoughts?

Darry · 21st February 2012, 10:54 AM

The output stage of BA1 works in pure single-ended.

With 0.58 A per MOSFET (6), the BA1 provides, with ± 32V, 50 watts into 8 ohms, 25 watts into 4 ohms but only 12 of 2 ohms, ...

Is there a "small" circuit that could push the output stage in class AB (in the style of the Aleph 0, 0s and 1), for at least 50 watts into 4 ohms and 2.

Regards

Darry

24th October 2011, 02:04 AM	#244
timbarnes diyAudio Member Join Date: Dec 2004 Location: Los Gatos	Can I raise the power supply voltage of BA-1? I'm going to keep my BA-3 with its own power supply, so I'm only concerned about power to the output stage and bias boards. I want to use my 27+27V transformer, which yields about 38V DC. It seems that the extra voltage would not burn the power transistors, but I'm not so sure about the bias boards. Any thoughts? __________________ Townshend Rock III, EAR 834P, Naim CD5i, First Sound Passive Preamp, Pass BA-3, Pass F4, Pi Sevens 5532 Preamp, JBOZ, DIY Silver cables, Open Baffles, DIY subwoofer, GainClone, o2 Headphone Amp

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21st February 2012, 10:54 AM	#245
Darry diyAudio Member Join Date: Mar 2005 Location: Southwest	The output stage of BA1 works in pure single-ended. With 0.58 A per MOSFET (6), the BA1 provides, with ± 32V, 50 watts into 8 ohms, 25 watts into 4 ohms but only 12 of 2 ohms, ... Is there a "small" circuit that could push the output stage in class AB (in the style of the Aleph 0, 0s and 1), for at least 50 watts into 4 ohms and 2. Regards Darry

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