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Old 18th September 2013, 05:24 PM   #3231
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Default preamplifier transistor amplifier with band limiting

send photos of my amp built for a client gradually send more photos. any comments or concerns I will be responding.


atte. Hernando B.
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Old 25th September 2013, 05:17 PM   #3232
acid_k2 is offline acid_k2  Italy
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Default JLH 2005 based amp

My last amp.

It's a stereo JLH 2005 derated to 5W/ch, about 15+15V dc power supply with capacitance multiplier, 150W transformer, only 1A bias for thermal dissipation reasons (+25C deltaT on 0.4C/W heatsinks), paralled TIP3055 output transistors, chassis in black painted chipboard, front panel in spruce.

Almost all materials recycled from the junk bin.
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Old 26th September 2013, 06:06 AM   #3233
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Location: Dona paula, Goa
Default My audiophile Leach from mostly recycled parts

It is purely for audio enjoyment and to prove to myself, the readings from DIYAUDIO. Speakers are Klipsch RB81 II

Gajanan Phadte
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Old 26th September 2013, 06:30 AM   #3234
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Location: Dona paula, Goa
photos continued

Gajanan Phadte
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Old 26th September 2013, 02:06 PM   #3235
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Location: Upstate NY
It must be Leach amp season. I just completed one on Jens Rasmussen boards in a DIY Audio Store 4U deluxe case.

I wasn't looking forward to tapping the holes, since last time I broke a lot of taps. Funny how much better that went with taps the proper numbered drills from McMaster Carr than the big box store taps and closest regular drill size. The only broken tap resulted from a distraction causing me to lose my grip on the heat sink, and I was able to back the broken part out and finish the same hole.

Unlike Gajanan, I used new parts. Nothing special for resistors, but Wima MKS caps for most of the film caps. The eagle eyed will spot that I goofed when ordering the resistors that set the zener current. Originally thought I'd be using 62V rails, so it was a bit high for the 55V rails I ended up having. A parallel resistor got the zener current back up over 5 mA.

PSU Boards from chipamp.com have 8 of 10 mounting holes that line up with the case's grid, good enough for me. Thank goodness for bringing things up with a variable transformer. I used MUR2020 rectifiers, which have anode and cathode reversed from what is on the silk screen. I hadn't thought that there might be TO220 diodes with the other orientation. Luckily, I noticed the rails were going the wrong way at a couple volts, so saved myself the joy of exploding caps. After reversing the rectifiers everything went smoothly with power up and test.

I have a Leach version 4.2, with resistor referenced cascode instead of the V4.5's and this amp's zener reference. That's just one of the changes that include better film caps and faster transistors, dual PSU, high speed rectifiers, more rail capacitance and of course board layout. I got a decent match of the BC546C/556C input transistors - less than 7 mV offset. All of that makes it hard to decide just what is responsible for the better sound of this new amp, but whatever it is, I like it. There is more low level detail and the sound stage opens up well beyond the speakers with many recordings instead of just a few.

I didn't dress up the store 4U case, so nothing exciting there. Here's a shot of the internal layout. The amps are dead silent. The bridge to the left of the transformer is Pass style ground lift. The two channel grounds join there.
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Last edited by BobEllis; 26th September 2013 at 02:24 PM.
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Old 27th September 2013, 03:39 PM   #3236
Mihkus is offline Mihkus  Estonia
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Quote:
Originally Posted by acid_k2 View Post
My last amp.

It's a stereo JLH 2005 derated to 5W/ch, about 15+15V dc power supply with capacitance multiplier, 150W transformer, only 1A bias for thermal dissipation reasons (+25C deltaT on 0.4C/W heatsinks), paralled TIP3055 output transistors, chassis in black painted chipboard, front panel in spruce.

Almost all materials recycled from the junk bin.
Just had to say, god damn! What a wonderful looking DIY case!
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Old 27th September 2013, 04:47 PM   #3237
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I notice the high end fuses used , do you think they make a difference ?
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Old 27th September 2013, 06:44 PM   #3238
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Analogrules, If you are referring to my Leach, they are just run of the mill ceramic fuses. I intended to order glass, but at least the current rating was correct.
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Old 27th September 2013, 06:49 PM   #3239
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Default Nice stuff here....people is very creative

Awesome thread!

Thanks to my dear friend Cal Weldon (well done)

regards,

Carlos
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Last edited by destroyer X; 27th September 2013 at 06:51 PM.
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Old 28th September 2013, 05:52 AM   #3240
nattawa is offline nattawa  Canada
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Quote:
Originally Posted by BobEllis View Post
It must be Leach amp season. I just completed one on Jens Rasmussen boards in a DIY Audio Store 4U deluxe case.
Nice build. Is the PSU of C-R-C construction? I noticed you mounted the TO-264 transistors to the heat sink with spring clips instead of using screws. That too is what I am intend to do with my new build. Would you mind sharing the source of the clips and it spec? Thanks!
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