Which implementation of the Aikido are you using in your amplifier? Will the output stage of the DH-500 still be class AB?
Looking at the Aikido? I'm not sure if I should configure it SRPP or cathode coupled.
Marc,
I'm using the Aikido Push-Pull. The output stage will be Class AB, I need lots of power for the bass panels.
The plan is to also build a Class A version (ala Moskido) and compare to OTL and tube/transformer output stages, for lower power applications.
Aikido Push-Pull
Stuart
Stuart, just noticed your output stage power supply. 113kuf -- per channel?!. Nice!
Is this something for you? http://http://audioxpress.com/article/Build-a-Hybrid-Tube-MOSFET-SE-Amp.html
Stuart, just noticed your output stage power supply. 113kuf -- per channel?!. Nice!
Pretty close. Actually it's hard to see, but there are 15 x 4700uF caps per rail, three on the bottom board with 10uF PP and 0.47uF PP bypass caps. So, 70.5kuF per rail, 141kuF total.
Guess it's a hair shirt approach.......
Also, the rectifier bridge is a Schottky deal.
The power switches on both of my units failed (while stock), so new, rear panel HD toggle switches have been installed and indicator lamps put on the front panel where the switches were.
IEC connectors for easy power cord changeouts.
Stuart
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how true. i guess we all really want to share everything but only a few root ideas can be divulged.
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I seek a casing idea for mine all plate hybrid. where the valve is on front outside the case.
someone ideas?
Idea like pic 2 cooling plate mosfets behind the tubes. stainless steel casing? high shining.
The case do housing 4 tubes for stereo, or a mono blok who has two.
This design sounds very good, much better as the others I have, new idea no feedback on tubes, therefore the use of the 6C19 who has mu of two and high current and low impedance.
regards
someone ideas?
Idea like pic 2 cooling plate mosfets behind the tubes. stainless steel casing? high shining.
The case do housing 4 tubes for stereo, or a mono blok who has two.
This design sounds very good, much better as the others I have, new idea no feedback on tubes, therefore the use of the 6C19 who has mu of two and high current and low impedance.
regards
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I can tell you the design do sound quite tube wise because of type of driving the mosfets. I have test it and a tube amp lover did listen and agree that it was quite close to tube sound, maybe bacause of there is no cathode follower driving the mosfets but a (beefy) plate follower who does that. You are a guitar lover I think because oy your picture, for these I think a hybrid is not quite fitted because when drive in distortion you can easely blow the mosfets, she never give the distortion you want, that is for guitar purpose afcouse, you need then pre-distortion circuit.
I need no marshal sound, but high end kind, and afcourse a nice housing I am try to design nicely, needs a pro outlook.
regards
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Hello
Anybody did the vilfort-hafler hybrid amp and compared it to the Moskido or Moscode or others hybrid amps ?
reliable tube/mosfet hybrid amp
https://www.diyaudio.com/forums/att...sfet-hybrid-amp-vilfort-hafler-conversion-png
Thank you
Bye
Gaetan
Anybody did the vilfort-hafler hybrid amp and compared it to the Moskido or Moscode or others hybrid amps ?
reliable tube/mosfet hybrid amp
https://www.diyaudio.com/forums/att...sfet-hybrid-amp-vilfort-hafler-conversion-png
Thank you
Bye
Gaetan
There is a whole talk on reliable hybrid designs here: YouTube
Slides here: Database Error 2019 Vilfort Audio.pdf
Have fun!
Slides here: Database Error 2019 Vilfort Audio.pdf
Have fun!
more on the Lazarus H-1
Here's the reverse-engineered schematic on the H1A - originally designed (apparently) by Allen Wright. I have a 1A and a 1 that I modified to the A. Amps sound VERY good - first drove quad 63's (best I used); now my LS50's / subwoofer combination.
Particularly like the inclusion of a servo which really seems to work well - now only need to have one control to set the bias. Also like the simplicity of the input circuit. Did simplify the upper grid biasing circuit to a DN2540 cc source feeding the 62V zener - one for each channel. Been working fine for ~20 years!
Charles
O yeah - did add two muffin fans (240V in series) - fit to /right underneath the top
Here's the reverse-engineered schematic on the H1A - originally designed (apparently) by Allen Wright. I have a 1A and a 1 that I modified to the A. Amps sound VERY good - first drove quad 63's (best I used); now my LS50's / subwoofer combination.
Particularly like the inclusion of a servo which really seems to work well - now only need to have one control to set the bias. Also like the simplicity of the input circuit. Did simplify the upper grid biasing circuit to a DN2540 cc source feeding the 62V zener - one for each channel. Been working fine for ~20 years!
Charles
O yeah - did add two muffin fans (240V in series) - fit to /right underneath the top
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I have a hybrid amp now for over 15 years, no defect, did design this myself, but in fact it was already designed as 90 procent of audio amps are a wheel already invented multiply times.
Thsi does nice, dv coupled tubes, controlled by a servo for correct tube temperature drift, and a speaker protection who is set on a longer on time because of dc on speakers while warm up, it is not much but still some volts.
I have this not yet on LTspice.
regards
Thsi does nice, dv coupled tubes, controlled by a servo for correct tube temperature drift, and a speaker protection who is set on a longer on time because of dc on speakers while warm up, it is not much but still some volts.
I have this not yet on LTspice.
regards
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