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NAP250 clone
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Old 8th November 2019, 03:07 PM   #121
stanislav1957 is offline stanislav1957  Russian Federation
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Originally Posted by JeffYoung View Post
Hi Stanislav1957,

Did you mean to post that to a different thread? It doesn't look anything like a NAP250 (other than the LTP and VAS current sources sharing the same reference)....

Cheers,
Jeff.
And than it is not similar? The only difference is the use of a more advanced voltage amplifier with Miller effect compensation.

And where a similar theme? Could you tell me please

Last edited by stanislav1957; 8th November 2019 at 03:13 PM.
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Old 8th November 2019, 03:28 PM   #122
JeffYoung is offline JeffYoung  Ireland
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The NAP250 circuit has a couple of features which make it (to my mind) quite different:

1) a heavily unbalanced LTP,
2) a quasi-complementary Baxandal output stage,
3) phase-correction networks on the two drivers

There are no doubt other more modern topologies that perform better, but the oddness of Julian Vereker's work, and the fact that the result sounds remarkably good given what appear to be significant limitations, are some of the things that make it so interesting.

Cheers,
Jeff.
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Old 8th November 2019, 03:36 PM   #123
stanislav1957 is offline stanislav1957  Russian Federation
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Originally Posted by JeffYoung View Post
The NAP250 circuit has a couple of features which make it (to my mind) quite different:

1) a heavily unbalanced LTP,
2) a quasi-complementary Baxandal output stage,
3) phase-correction networks on the two drivers

There are no doubt other more modern topologies that perform better, but the oddness of Julian Vereker's work, and the fact that the result sounds remarkably good given what appear to be significant limitations, are some of the things that make it so interesting.

Cheers,
Jeff.
And why in the 21st century quasi complementary output
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Old 8th November 2019, 04:00 PM   #124
JeffYoung is offline JeffYoung  Ireland
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Fly to Colorado and ride the train from Durango to Silverton. You'll be riding in a coach made in the late 1800s, pulled by a steam engine built in the 1920s. Some things are just cool.

Click the image to open in full size.
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Old 8th November 2019, 04:09 PM   #125
stanislav1957 is offline stanislav1957  Russian Federation
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Fly to Colorado and ride the train from Durango to Silverton. You'll be riding in a coach made in the late 1800s, pulled by a steam engine built in the 1920s. Some things are just cool.

Click the image to open in full size.
Go to the Lord Veliky Novgorod to dig ancient excavations, find letters and read the living history from the 7th century to the 13th century.

Last edited by stanislav1957; 8th November 2019 at 04:15 PM.
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Old 8th November 2019, 04:54 PM   #126
Vrystaat is offline Vrystaat  South Africa
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Stanislav, would love to visit that place, beautiful architecture !!
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Jan
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Old 8th November 2019, 05:07 PM   #127
stanislav1957 is offline stanislav1957  Russian Federation
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Stanislav, would love to visit that place, beautiful architecture !!
Приезжайте. Посетите Новгород, Ладогу Старую Руссу.,Сходите в Кремль Новгородский ,зайдите в Святую Софию . Всегда рады туристам.

Arrive. Visit Novgorod, Ladoga And Staraya Russa.,Go to the Novgorod Kremlin, go to St. Sophia . Tourists are always welcome.
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Old 8th November 2019, 06:02 PM   #128
Vrystaat is offline Vrystaat  South Africa
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Great stuff sir, and it would be nice to try some real Russian vodka !!
Have to wait 5 more years for pension, want to go before 60 !!
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Old 8th November 2019, 06:12 PM   #129
stanislav1957 is offline stanislav1957  Russian Federation
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Great stuff sir, and it would be nice to try some real Russian vodka !!
Have to wait 5 more years for pension, want to go before 60 !!
Russian vodka, Yes Tatar pilaf and rye bread! Guests are welcome.
Русская водка,да татарский плов и ржаной хлеб.Приезжайте.Гостям рады.
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Old 8th November 2019, 07:28 PM   #130
JeffYoung is offline JeffYoung  Ireland
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Veliky Novgorod does look fantastic. I've always meant to take a cruise from Copenhagen to St. Petersburg; looks like this would make a fine day-trip from St. Petersburg.
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