This is not just another Aleph

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#201
fcel said:
Peter,
Do you have 8 transistors mounted on the bottom side of the chassis (can't be seen from the pictures that you just posted) to get you 16 transistors per chassis?
Click to expand...

He posted this before. 4 per bank = 16 total.

--
Brian
 

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#202
BrianGT said:
Has anyone gone as far as make a Fruglephile(tm) amplifier?
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GainKlones count as Frugal-phile(tm). So do Pheonix amps (tube amps resurrected from old console amps), and i suspect that a ZEN could be done on a Frugal-phile(tm) budget. I am sure their are more examples. In all cases it is more of finding cheap iron and (for SS) cheap heatsinks -- dead computer monitors can come in handy here, or if the amp is small enuff , the aluminum backing dish you are using as a chassis will do the job.

dave
 
#204
Peter Daniel said:
Dave,

With the price of second batch boards for Aleph X, 4 devices per channel, 250VA transformer per channel and cheaply obtained heat sinks, Aleph X qualify for Frugal-phile(tm) in my book as well.😉
Click to expand...

That's a good point. In fact, I'm hoping to build a no-frills
2-channel Aleph-X (decent but non-exotic parts...and some
surplus items) for <$300 USD.

Dennis
 
#206
No buzz, I had substantial hum when caps on both inputs were not mached (.06u and 2u). Currently I have very slight hum, which is not detectable from listening position. There is no hum when I switch the amp on, and then it gradually emerges. I suspect that happens after thermistors warm up. Maybe 120,000u per channel is not enough?😉
 
#207
Your amp has total 10 large caps with wire rails. The terminal of the wire rails is at the one end. I suppose it might be the cause of the hum if you hear it when the source is disconnected. I would have the terminal at the center of the cap complex. What do you think?

JH
 
#209
Your amp has total 10 large caps with wire rails. The terminal of the wire rails is at the one end. I suppose it might be the cause of the hum if you hear it when the source is disconnected. I would have the terminal at the center of the cap complex. What do you think?

JH
Click to expand...

I agreed. I have just completed the re-wiring of those caps on my JLH power supply which I complainted that I could not used more caps like 3 X 15000uf per rail for it strangled the highs and loss of dynamics. Now I can used all the caps I want. I used to have those caps in the same arrangement as the ones in Peter's picture with two wire rails. Now I change to wire indivdual cap's to a star point, make sure all wires are exact equal length to the star point. One star point to connect to the middle of the rail. Really clean up the sound a lot. I should say it does not mess up the sound instead. I was grinning cheek to cheek yesterday. The hair in the back of my neck stands again!!.
Chris :happy2:

P.S. no inductor needed....nor series resistor yet
 
#212
Peter,
don't get lazy on me now, between the p2p, the heatsinks the time you put into it, you got $1500 bucks of exotic parts and maybe 100hrs of work in the AX, the kind of sloppiness in the GND connections is inexcusable. I am gonna loose faith in you if you do that! 😉

I looked at the AX picture, it wouldn't be too bad to beef up the GND connection of the skinned caps you can use the Cu strip that you use for the rails. Are you out of that? No problemo, if you give me the measurements I can send you a couple of pieces of Cu plate 1/32 thick to use as ground plane (OFC and FOC). You gotta get rid of the standoff thugh.
 
#213
The best I can do to keep you guys happy is to cut those wire rails in half (at the center) and use additional wires to connect them to common point at the bridge. This way I'll reduce the problem by half.😉

I was also thinking about removing 100ohm output to ground resistors. They are using the same ground rail as the input and this may cause problems too. The DC is so stable that I might be able to do without them. I'll try it today.

I also suspect that my caps bank is not big enough. Because of the nature of the amp it should be at least doubled by regular standards.
 
#216
It's not an issue of pride. I wanted my amps to be built properly, yet one always have to choose compromise at some stage. For me it was acceptable way to do it, so I did it. We still don't know if different way of arranging things will be detectable sonically and I don't know if it's worth the trouble. Actually it's better to leave it this way and built another one with improved layout and compare the differences.

This bank of capacitors is only auxillary. It is 28,000u. The main one is close to output stage and totals 36,000. The main currents don't flow through copper wire rails (ga 12) because it is paralelled at the bridge only. From bridge the thermistor feeds the main rails.
 
#218
I have never uased the Cu plates. Instead, I always make symmetry about the center so that the electric potential is to be virtually zero at the center where half symmetry and another half symmetry see each other with the same electric potentials (say, local super symmetry). I do not care the wire gauges if they are thick enough to carry the current.

JH
 
#219
jh6you said:
I have never uased the Cu plates. Instead, I always make symmetry about the center so that the electric potential is to be virtually zero at the center where half symmetry and another half symmetry see each other with the same electric potentials (say, local super symmetry). I do not care the wire gauges if they are thick enough to carry the current.
JH
Click to expand...
Either ones. The aim is to have the zero potential truly zero on all components concerned. If you have screw-type-contact condensers a CU plate it's surely more practical... the other way around with soldering-contacts kinds.

It's just that a CU plate is so much more handsome...😉

ciao,
Roberto Amato
 
#220
Peter Daniel said:
It's not an issue of pride. I wanted my amps to be built properly, yet one always have to choose compromise at some stage. For me it was acceptable way to do it, so I did it. We still don't know if different way of arranging things will be detectable sonically and I don't know if it's worth the trouble. Actually it's better to leave it this way and built another one with improved layout and compare the differences.

This bank of capacitors is only auxillary. It is 28,000u. The main one is close to output stage and totals 36,000. The main currents don't flow through copper wire rails (ga 12) because it is paralelled at the bridge only. From bridge the thermistor feeds the main rails.
Click to expand...

You did a great job on the amplifier. I wouldn't be tearing it apart this soon. Enjoy it an listen to it! Thanks for the encouragement for getting me to work on finishing my version of the Aleph-X.

I was at Home Depot, and they have bare solid copper conductor wire 14ga up to 4ga. Would the thicker copper wire be better for the capacitor bank? I was planning on tieing them together in a similar arrangement. Would I be better just using multiple strands of normal 18ga wire and making a star arrangement?

--
Brian
 
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