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Old 23rd July 2008, 06:15 PM   #191
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Quote:
Originally posted by Peter Daniel
I expressed some thoughts on further upgrades to a premium kit here: http://www.diyaudio.com/forums/showt...32#post1231532

More reading on capacitor comparisons can be found in those links:

http://www.diyaudio.com/forums/showt...431#post574431

http://www.diyaudio.com/forums/showt...230#post581230

Better case is certainly important if you want to get the best out of the amp. My present amp was described in this thread: The most advanced GainClone amp yet and here I pushed the GC concept as far as I thought was possible

Personally, I don't like buffers in the amp, the buffer should be placed with a source. A simple fet buffer works fine with NOS DAC, one such example is buffer described in Figure 15C in Borberly article: http://www.borbelyaudio.com/adobe/ae699bor.pdf

At the amp's input, a swtching attenuator is usually preferred (25k or so).

Thanks very much for the valuable info Peter. I checked and read through the links you have given here. And I completely agree that GC in its original form is probably the best GC. As there is certain naturalness and delicate harmonic balance in its sound which might easily be lost by sticking anything before or after it. If aint broke, dont fix it, so i wont

But i see that you suggested using BG 100uf N caps on amp boards. I would like to try this mod and see if i can get better clarity in vocals and higher mids. I understand that i would need to replace existing Panasonic FC caps on amp board with same number of BG 100uf N caps? Please correct me if i am wrong.

Saw your case work and i must say its a masterpiece. simply awesome! i would love to build something like that someday. For now, lets see if i can build a simple and neater case

Sorry for my ignorance but where exactly do we use the switched attennuators? Is it a substitute for volume pot?

Also, currently i am using a 100K pot for volume control as it was the only one available at the time i was building. I still need to order the Nobel one. Does this value affect the amp in anyway? I should be using something in range of 20-50K, isnt it?

Can i safely remove the input resistor without affecting the amp in anyway and would it help to improve sound?

Cheers!
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Old 23rd July 2008, 09:57 PM   #192
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Yes, the 220R input resistor in most cases can be removed, especially if you have potentiometer.

I actually meant stepped attenuator in place of potentiometer, which is probably more popular term, a recent discussion can be found in Blowtorch thread: http://www.diyaudio.com/forums/showt...61#post1568061

100k will work but it's a bit too high, the potentiometer should preferrably be in a 10k-25k range, 50k being maximum.

On amp board my first choice is indeed BG N 100/50. For mids and highs you don't need any additional caps here and those small BG N will give you the best sonic signature I experienced so far from a GC. However, for full range they are not enough to smooth PS ripple and some hum will be present; that's why additional BG STD 1000/50 are placed at rectifiers. The latter may also further improve bass response.
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Old 25th July 2008, 05:39 AM   #193
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Lightbulb Have you try this Peter?

Peter,on your boards "LM3875".on the PS board.you use small caps 4.7/10uf 50v , and 1500uf caps on the "chip" board.
one time I was trying differents caps on the rectifier board and instead putting small caps on the rectifier board,I used Panasonic 1500uf 50v and Black Gate 1000uf 50v on the "chip" boards.and I do not kbow but I liked the sound better with the 1500uf caps on the bridge rectifier...I got better or more bass.can this be possible to leave the 1500uf caps on the rectifier board and the 1000uf BG on the "chip" boards?.


Thank you!
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Old 25th July 2008, 06:13 AM   #194
mattjk is offline mattjk  United States
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What is the best way to hook up an LED to one of the original rectifier boards?

Click the image to open in full size.

does my wiring look OK, or should I get rid of all the braides and twists?

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Old 25th July 2008, 06:33 AM   #195
Nuuk is offline Nuuk  United Kingdom
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Quote:
What is the best way to hook up an LED to one of the original rectifier boards?
Have a read here .

Quote:
does my wiring look OK, or should I get rid of all the braides and twists?
With those lengths it's really down to aesthetics so you are the best judge of what you are happy with.
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Old 26th July 2008, 01:08 AM   #196
mattjk is offline mattjk  United States
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Thanks Nuuk. I like the magnet wire idea, so I bought a roll. Then I got a stupid idea to rewire the amp, since I didn't like my first attempt.

So... now that it looks nicer, now my right channel does not work! I triple checked every connection with a meter, and also checked for cold solder joints. every pad on the right channel seems to match with the left. Did I kill the chip?

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Old 26th July 2008, 02:15 AM   #197
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Try jumpering across the magnet wire, it's easy to not get all the insulation removed, alternatively, try jumpering from the good working input to the nonworking side. Just my 2c worth
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Old 26th July 2008, 02:20 AM   #198
mattjk is offline mattjk  United States
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thanks, Sparky. Yes, when I checked, I went from pad or rca connector, directly the to pads on the chip. I think I destroyed the chip somehow.
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Old 26th July 2008, 02:45 AM   #199
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Quote:
Originally posted by mattjk
Did I kill the chip?
What offset do you measure on each channel? Does the offset change when adjusting volume?
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Old 26th July 2008, 02:46 AM   #200
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Default Re: Have you try this Peter?

Quote:
Originally posted by lanchile07
Peter,on your boards "LM3875".on the PS board.you use small caps 4.7/10uf 50v , and 1500uf caps on the "chip" board.
one time I was trying differents caps on the rectifier board and instead putting small caps on the rectifier board,I used Panasonic 1500uf 50v and Black Gate 1000uf 50v on the "chip" boards.and I do not kbow but I liked the sound better with the 1500uf caps on the bridge rectifier...I got better or more bass.can this be possible to leave the 1500uf caps on the rectifier board and the 1000uf BG on the "chip" boards?.

Sure, if it works better for you
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