Well Jean hiraga didn't use chokes in his design, if you feel that resistors do the trick, why not use them ? I believe hiraga had 1 ohm resistance, so voltage would drop a bit, when I begin on mine, I will go through a lot of listening, trying different configurations like you are doing now.
Maybe, try keep the L and add some R ..?
Maybe, try keep the L and add some R ..?
Anyone built something modular like this Krell KSA100 with risers, busbars - minimizing cables?
Finished the p3a amplifier today.
Repurposed chassis with glass in front, it's fairly neat inside, so didn't choose frosted glass.
Bias can be monitored and adjusted from top.
I wanted to post some measurements in p3a thread but it looks like I've lost my bnc cables, it will have to wait.
Its performs very good, extremely silent, followed hifisonix pdf on dual mono grounding to the letter.
Repurposed chassis with glass in front, it's fairly neat inside, so didn't choose frosted glass.
Bias can be monitored and adjusted from top.
I wanted to post some measurements in p3a thread but it looks like I've lost my bnc cables, it will have to wait.
Its performs very good, extremely silent, followed hifisonix pdf on dual mono grounding to the letter.
Attachments
Since I sold my first p3a here the new one comming to life.
Bc550c input. TTA004B/TTC004C vas and driver . Sanken 2sa1216 2sc2922 output.
Had stability issues and found the culprit was my large (audiophile) teflon cap 4.7uf 160v picked up a lot of noise,
Small square wima 6.8uf fixed it, electrolytics are rubycon rx30 130 degrees caps, I expect very long life.
20000uf 63 volt Siemens sikorel caps for rails. Pr side
And the mainthing, it sounds wonderful, no measurements yet
Bc550c input. TTA004B/TTC004C vas and driver . Sanken 2sa1216 2sc2922 output.
Had stability issues and found the culprit was my large (audiophile) teflon cap 4.7uf 160v picked up a lot of noise,
Small square wima 6.8uf fixed it, electrolytics are rubycon rx30 130 degrees caps, I expect very long life.
20000uf 63 volt Siemens sikorel caps for rails. Pr side
And the mainthing, it sounds wonderful, no measurements yet
Attachments
I have several designs about Power Amp, normally cascode dual JFET differential input
with HV supplies, high power output upto 158W,very large cases and heavy transformers,
and of course large power consumption and heat problems.
But when I get older, I find just a high quality smaller power amp will be better for my small
listening room now, so I redesign my old 25W IPT+0dB Power Buffer (the manufator named it
IRON-AMP) by cancelling the 10dB IPT to a more pure,powerful,regulated and crytal clear sound
unity-gain power DB amp.
So farewell, my old EU-152, my ULTIMA-PXA-1 power amp and IRON-AMP!
with HV supplies, high power output upto 158W,very large cases and heavy transformers,
and of course large power consumption and heat problems.
But when I get older, I find just a high quality smaller power amp will be better for my small
listening room now, so I redesign my old 25W IPT+0dB Power Buffer (the manufator named it
IRON-AMP) by cancelling the 10dB IPT to a more pure,powerful,regulated and crytal clear sound
unity-gain power DB amp.
So farewell, my old EU-152, my ULTIMA-PXA-1 power amp and IRON-AMP!
Hopefully, the final update to my multichannel power amp, i have changed the protection board (over temp, dc protection, soft start, ok supply monitor) with smd devices board, and i created more space inside for better ventilation. However, also for the modified quads (4 sanken power devices per channel, opa 134 non inverting config...) i have done some upgrades to improve gain lineatity (measured with scope and signal gen, less than +/- 0.5dB in bandwidth of 27hz - 27Khz, the +/-3dB bandwidth is 13hz - 55 khz). Now, I am happy with sound and overall performances, and hopefully no update needed, because is so heavy this monster and i need to carry it in my cellar to my private lab, weights probably 35kg....
Attachments
Jesus christ what a beast, just look at all the cables,, that's an amplifier that doesn't waste space..
Cool build, but serviceable???
Cool build, but serviceable???
@Amplitude: Thank you very much for your feedback. It is serviceable, but definetely it would have been much better if i would have had a larger case on length, for input board, especially.
Copper pieces? The picture is showing the left side control and driver boards of a Krell KSA100 amplifier.
If you are referring to the busbars, I think that they are made of anodized aluminium, not copper.
I'll bite.
Old school McIntosh turret board power supply on a first gen, solid-state integrated MA6100. The factory board was old school, someone got at it with a repair. Some parts not original, broken solder posts and a few "blobs" here and there. It worked for sure but can we do better?
Sometimes it's really just easier to design, source, build and replace with a new assembly.
First is factory board.
Replacement PC board
Installed in amplifier:
Old school McIntosh turret board power supply on a first gen, solid-state integrated MA6100. The factory board was old school, someone got at it with a repair. Some parts not original, broken solder posts and a few "blobs" here and there. It worked for sure but can we do better?
Sometimes it's really just easier to design, source, build and replace with a new assembly.
First is factory board.
Replacement PC board
Installed in amplifier: