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Which amp to build ?
Which amp to build ?
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Old 12th October 2017, 03:28 PM   #1
DAN000 is offline DAN000
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Default Which amp to build ?

I'm a little lost about which amplifier could build over 30W-50W, with Lundahl output or similar perfomance.
Some very good design, I am looking for high quality first of all.

I would appreciate if someone can help me with this, thank you very much!
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Old 12th October 2017, 03:35 PM   #2
jazbo8 is offline jazbo8
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Which amp to build ?
Try this: Power Amplifiers with Valves
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Old 12th October 2017, 03:46 PM   #3
kodabmx is online now kodabmx  Canada
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Lundahl has it on their site for free...

http://www.lundahl.se/wp-content/upl...fier_30wpp.pdf
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Old 12th October 2017, 04:20 PM   #4
Eli Duttman is offline Eli Duttman  United States
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Quote:
Originally Posted by DAN000 View Post
I'm a little lost about which amplifier could build over 30W-50W, with Lundahl output or similar perfomance.
Some very good design, I am looking for high quality first of all.

I would appreciate if someone can help me with this, thank you very much!
High quality O/P "iron" definitely brings "classic" Williamson style circuitry into play. Mullard style circuitry is a 2nd "classic" option. Perhaps the best "vintage" implementation of Mullard style circuitry is the Harman-Kardon Citation V. Very good, to begin with, and can be tweaked further. Carry the high gm theme further by using an ECC99, instead of a 6CG7, in the LTP role. Replace the LTP tail resistor with a 10M45S CCS.

BTW, the 12BY7 shown is getting scarce and is (IMO) best reserved for already extant units. I've provided a 6922 cascode, which is quite suitable as a replacement for the 12BY7,
Attached Images
File Type: gif Citation-V-full-final.gif (273.3 KB, 174 views)
File Type: jpeg Cascode 6922 Mullard Front End.jpeg (636.5 KB, 173 views)
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Old 12th October 2017, 04:36 PM   #5
waltube is online now waltube  Italy
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Hi

look this with test lab

P-P with EL34/KT120


Walter
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