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100W Ultimate Fidelity Amplifier
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Old 22nd July 2019, 07:25 AM   #11541
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
1 of 2 Digikey parcels arrived today.
I just poked the caps in to have a look and damn my AX14's are going to be colourful! 100W Ultimate Fidelity Amplifier
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Old 22nd July 2019, 07:38 AM   #11542
avtech23 is offline avtech23  Australia
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Join Date: Dec 2017
Location: South 'straya
100W Ultimate Fidelity Amplifier
Looking good!

I've got boxes of parts waiting for me at home ready to get started on mine. Can't wait!
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The ever growing project list.. :NAP140 Clone, NAD 3020i & 3225PE, JLH1969, TDA2050, Fender 5F2A Princeton, NE5532 Pre, SHPA, B1 Korg, T2. : VSQC Phunk Style, Retro 50W, Filmosound 601, LM4780. : Apex AX-14, TGM-10, TDA7265 (Last in line)...maybe
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Old 22nd July 2019, 02:47 PM   #11543
panggih is offline panggih  Indonesia
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Join Date: Oct 2012
Location: jakarta
Quote:
Originally Posted by 44250 View Post
I also had problem with bias until I had MJE15034-35 as drivers. when I replaced them with 2SA\2SC drivers as in schematic I had no bias problem.
I use mje15030 / 31 for current drivers
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Old 23rd July 2019, 06:46 AM   #11544
DevilDrums is offline DevilDrums  Russian Federation
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Hello , I have a problem .Starting ax14 with a constant voltage of 31v . the lamp is not lit in the circuit of 220v . Connected SGND to the ground of the power supply nothing has changed. The second channel is full short, the bulb in the 220v network is lit constantly and brightly. ask for help. Thanks

<a target="_blank" href="https://d.radikal.ru/d27/1907/8c/8afbf4057d9b.jpg"><img src="https://d.radikal.ru/d27/1907/8c/8afbf4057d9bt.jpg" /></a>


<a target="_blank" href="https://b.radikal.ru/b16/1907/01/a0ceca646d02.jpg"><img src="https://b.radikal.ru/b16/1907/01/a0ceca646d02t.jpg" /></a>


<a target="_blank" href="https://b.radikal.ru/b35/1907/66/d5ac89a11e6f.jpg"><img src="https://b.radikal.ru/b35/1907/66/d5ac89a11e6ft.jpg" /></a>
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Old 23rd July 2019, 07:57 AM   #11545
DevilDrums is offline DevilDrums  Russian Federation
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[QUOTE=DevilDrums;5860787]Hello , I have a problem .Starting ax14 with a constant voltage of 31v . the lamp is not lit in the circuit of 220v . Connected SGND to the ground of the power supply nothing has changed. The second channel is full short, the bulb in the 220v network is lit constantly and brightly. ask for help. Thanks
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Old 23rd July 2019, 02:12 PM   #11546
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
Still building.....AX14. I'm chipping away a little bit everyday. Making changes here and there.
Just read further back in the thread to dump the 50v 100pf ceramic caps. Must be at least 100v. So will probably put a couple more micas in tomorrow. Still waiting on my C6 100uf 16v caps to arrive. I have a Transistor matcher being sent to me from a friend. Then I can go through and see what I've got matched. Also waiting on my 0.33r resistors err. I also have some nice fuse holders coming but might go the naked single clip end versions. What size Heatsinks is everyone using? Conrad Heatsinks isn't to far away from me. Might just go the 350mm x 152mm x 50mm that I have for my Pass AlephMini amp.
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Old 24th July 2019, 11:58 AM   #11547
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
My 800va toroidal arrived. I will be using it with the Honey Badger I'm building but will also use this same toroidal for the A40 I build down the track.
I'm still waiting on parts for my AX14. I have a 300va 25v-0-25v toroidal for it will this be fine? What optimal for the AX14 Prasi Version. Thanks20190724_165917.jpgIMG_20190724_171559_689.jpg20190724_172928.jpgScreenshot_20190724-205311_Adobe%20Acrobat.jpg
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Old 26th July 2019, 05:44 PM   #11548
bullittstang is offline bullittstang  United States
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Join Date: May 2013
Location: Detroit, MI
100W Ultimate Fidelity Amplifier
I wanted to come full circle - I made 5 channels of the dual output FH11 (from EagleMod's v1.07) and due my stupidity 1 channel let out the Magic Smoke.
I'm posting a few (very poor) pictures of the still in progress build. Let me know if you have suggestions or comments.

PSU - ~68V unloaded, ~65 with a load, with 100V/40,000uF caps (PSU in pic was for initial testing at +/-40V).
Heatsink is 10-1/2" x 5" with 1" fins and a 3/8" base. 2 channels on each HS
4U case with full vented both and top

I have played loud music and a 1k sine wave for over an hour with both channels playing, and the fins stay at ~45C and I can easily put my hand on it for 5-10 seconds without discomfort.
It will be inside an enclosure, so no hands will be able to touch it even it reaches 60C+ so I don't think I will be a problem. I have had two hard weeks of testing all 4 channels inside the case, without a problem.

The last picture is my Oscope results just barely into clipping (no load) don't have a big enough dummy load for a 8/4r try (only have 100 watts). If my math is correct 121V is ~199 watts - right as clipping occurs.

I just got the Oscope, so this was my first try, so let me know if you see errors in my methods. I just monitored input on Channel 1 (not shown in pic) and output on channel 2 and turned up the input until I saw clipping (121V) on the output, using a 1k sine wave at 0db from my iphone app.

Thanks to APEX, xrk971, prasi, eaglemod - I would say this is a beginner amp because of all your hardwork, it really is order, populate and power-up. Just make sure you turn the bias pot completely counter-clock-wise before powering up (don't ask me how I know) and use a DBT, you can make this amp your first try without any issues.
Attached Images
File Type: jpg partial.jpg (111.4 KB, 343 views)
File Type: jpg partial2.jpg (137.0 KB, 338 views)
File Type: jpg pair on heatsink.jpg (136.0 KB, 332 views)
File Type: jpg Left on heatsink.jpg (117.8 KB, 324 views)
File Type: jpg Right on heatsink.jpg (115.4 KB, 334 views)
File Type: jpg FH11V1.0.7view.JPG (383.2 KB, 141 views)
File Type: jpg FH11-HV-V1.07.JPG (130.5 KB, 163 views)
File Type: jpg Oscope.jpg (121.1 KB, 122 views)
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Old 26th July 2019, 05:54 PM   #11549
prasi is offline prasi  India
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Location: Pune, India
100W Ultimate Fidelity Amplifier
Quote:
Originally Posted by HatlessChimp View Post
My 800va toroidal arrived. I will be using it with the Honey Badger I'm building but will also use this same toroidal for the A40 I build down the track.
I'm still waiting on parts for my AX14. I have a 300va 25v-0-25v toroidal for it will this be fine? What optimal for the AX14 Prasi Version. Thanks
300VA with 35V-0-35V will be fine with 8 ohm load stereo.
Also input RC filter cap will be fine with 50V.
Only those which fit across b-c of drivers and across feedback resistor need to be higher voltage.
If you find silver mica's difficult or costly to procure, use NPO/C0G 100-200V rated ones.

All the best for your build. If you need any more clarification let me know, I will try and help.

regards
Prasi
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Old 26th July 2019, 07:03 PM   #11550
still4given is offline still4given  United States
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Join Date: Oct 2004
Location: Victorville, CA
100W Ultimate Fidelity Amplifier
Quote:
Originally Posted by bullittstang View Post
I wanted to come full circle - I made 5 channels of the dual output FH11 (from EagleMod's v1.07) and due my stupidity 1 channel let out the Magic Smoke.
I'm posting a few (very poor) pictures of the still in progress build. Let me know if you have suggestions or comments.

PSU - ~68V unloaded, ~65 with a load, with 100V/40,000uF caps (PSU in pic was for initial testing at +/-40V).
Heatsink is 10-1/2" x 5" with 1" fins and a 3/8" base. 2 channels on each HS
4U case with full vented both and top

I have played loud music and a 1k sine wave for over an hour with both channels playing, and the fins stay at ~45C and I can easily put my hand on it for 5-10 seconds without discomfort.
It will be inside an enclosure, so no hands will be able to touch it even it reaches 60C+ so I don't think I will be a problem. I have had two hard weeks of testing all 4 channels inside the case, without a problem.

The last picture is my Oscope results just barely into clipping (no load) don't have a big enough dummy load for a 8/4r try (only have 100 watts). If my math is correct 121V is ~199 watts - right as clipping occurs.

I just got the Oscope, so this was my first try, so let me know if you see errors in my methods. I just monitored input on Channel 1 (not shown in pic) and output on channel 2 and turned up the input until I saw clipping (121V) on the output, using a 1k sine wave at 0db from my iphone app.

Thanks to APEX, xrk971, prasi, eaglemod - I would say this is a beginner amp because of all your hardwork, it really is order, populate and power-up. Just make sure you turn the bias pot completely counter-clock-wise before powering up (don't ask me how I know) and use a DBT, you can make this amp your first try without any issues.
With no load on the output you can't measure the RMS output wattage because the resistance portion of the equation is missing.
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