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Old 12th October 2014, 09:26 AM   #3691
Federmann is offline Federmann  Czech Republic
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Send a message via ICQ to Federmann Post your Solid State pics here.
Default HQQF audio amplifier

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Old 12th October 2014, 04:29 PM   #3692
johndaf is offline johndaf  Greece
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Federmann excellent job very beautiful !
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Old 12th October 2014, 11:53 PM   #3693
nathanpc is offline nathanpc  Brazil
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Here's my latest amp, it's a compact 6W/channel power amplifier:

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Here's the discussion thread for it and if you want to know more about it I highly recommend you to read this blog post.
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Projects: Power12 - Mini12 - Mini6 - MintyUSBoost
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Old 13th October 2014, 03:17 AM   #3694
Ronj is offline Ronj  Singapore
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Default Denon PMA-680R Upgrade/Recap

Anyway I have successfully completed the upgrade/re-cap of my Denon PMA-680R. Bias currents are set as for PMS880R. I have used film caps in all Signal path. Replaced cheap NJM4558 Op-Amps by using "DIP Sockets" and with OPA-2134PA(Both for Tone board and Phono section). Minimally increased power supply filter caps from 10000uF to 12000uF. Almost all cermaic caps were replaced with polypropylene or polystyrene you can see all those red WIMAs in the picture.

Painted the chassis as well.

Posting all the pictures for anyone who needs reference on how to dismantle/assemble back in the future.

And my Amp sounds very good. Extremly good infact. Here are some pics starting from "re-assembling" the amp
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Old 13th October 2014, 04:49 PM   #3695
apexaudio is offline apexaudio  Serbia
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AX14Px6+PSU10x2
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Old 14th October 2014, 07:19 AM   #3696
Federmann is offline Federmann  Czech Republic
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Default amplifier HQQF

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Old 14th October 2014, 07:21 AM   #3697
Federmann is offline Federmann  Czech Republic
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Default power amplifiers HQQF

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Old 19th October 2014, 04:34 PM   #3698
Parasonic is offline Parasonic  United States
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Default Battery powered pre

Needed a boost for my small power amps - this was a great solution. Had doubts about MPF-102 as audio device, and had a devil of a time getting two matched per the procedure at beavishifi.com (went through over 40 jfets), but the result is very good IMHO. I made the coupling cap to the volume control semi-removable, as with these Dayton caps in place, squares are outstanding from about 100 Hz through 100Khz, with some irregularities below this. In listening however, lows do not appear to be a problem as they are present, and of "good quality" (for me). I will want to try some different caps for the heck of it. I realize that improvements can be made dealing with input capacitance of these devices, i.e. buffer etc., but I like the simplicity of it too much-and as long as the music presentation is good..........its good.

Beavis Hi Fi

Cheers,
Terry
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Old 21st October 2014, 02:22 AM   #3699
Scorpion is offline Scorpion  Canada
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Default Scorpion Hotrodded DCB1

Hi guys,

Here are a few pics of my DCB1.

99% done. Just need to design an aluminum "ring" around the knobs in order to have volume gradation for my dual step attenuators.

Regards
Scorpion
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Old 21st October 2014, 02:27 AM   #3700
Scorpion is offline Scorpion  Canada
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And some more pics...
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