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,
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 ....
Hi PMA what speaker relays you use, and are ~15mF per rail enough?
Pavel (One and Only unique),
I thought tubes/valves are still considered discrete parts ?
=> HISTORIE FIRMY TESLA ELECTRONTUBES S.R.O.
So who made/makes the flashy Tesla capacitors in Pavla2's amp ?
I thought tubes/valves are still considered discrete parts ?
=> HISTORIE FIRMY TESLA ELECTRONTUBES S.R.O.
So who made/makes the flashy Tesla capacitors in Pavla2's amp ?
Hi PMA what speaker relays you use, and are ~15mF per rail enough?
Hi Bogdan, it is a Finder relay, rated current 30A, peak current 50A.
Regards,
Tesla Vrsovice also manufactured foil caps (47nF-2% ) ?
Not Tesla Vrsovice, but Tesla Ostrava. Now ES Ostrava:
Electronic components Ostrava - components, capacitors, potentiometers, trimming resistors, suppression chockes
Regards,
Nice work.
Very nice result Pavel - Kudos to you.
Thanks
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,
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,
This is the last and final version of this amplifier. The specs are 2 x 150W/8ohm, 2 x 300W/4ohm. It measures 2 x 190W/8ohm and 2 x 330W/4ohm. It has a discrete JFET balanced input and also a single-ended RCA input, selected by a switch at the rear panel.
I see that the amp came to perfection.
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