Solid Solid State Power Amplifier

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Thanks for your kind words, Hugh, Michael and mlloyd1.

Regarding VAS mosfets - there are several reasons for me to use them, but let me not reveal all of them 😉

One of the reasons is VAS current 20mA (in the bigger amp version) and supply voltage 2 x 58V - I guess you can see the dissipation of these parts.

Best regards,
 
Several small mods ....
 

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After one year and a half of tests and evaluation, there is some small upgrade to this amplifier. The new version is no. 6, and it is called PA4_V6. It is rated at 2 x 150W/8 ohm and 2 x 300W/4 ohm. It has true balanced input now, discrete, without opamp. The amplifier is quite fast, and does not suffer from any cross-conduction problem, as seen from 100kHz/8 ohm measurement. Please also note perfect behavior when clipping.
 

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Hi all,

thanks for your kind words.

There is no problem with transformers, as they have wide plastic circular base and there are two plates - perforated mounting plate and solid bottom plate in a distance of some 4mm, so the whole thing is quite solid and does not bend.

Output DC protection is made with power relays. I am quite conservative in case that the amplifier goes to a customer. I still plan to evaluate MOSFET protection for several weeks (at least) before it will be released.

Cheers,
 
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