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Old 19th June 2015, 08:13 PM   #3281
acamilicko is offline acamilicko  Serbia
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@Walter man, industrial case design Bravo!
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Old 4th July 2015, 04:17 PM   #3282
OllBoll is offline OllBoll  Sweden
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It has been a while but at last it is finished!

4 channels was once F2Js but now have become something else, I jokingly call them F2I =). So single ended inductor loaded R125s. 2 bigger amps with Hammond 193Vs and 2 smaller tweeter amps with 193Ts.

Below the metal platform there are 2x 150W SMPSes which output ~ 26.5V. There is also a Hypex DLCP SMPS hiding there too =)

The reason for such a high voltage is that my speakers (which are not yet finished ) are 16 ohm. The bigger amps run at 1.8A and the smaller ones at 1.4A. There are no parallel resistors either as I love current sources! The drivers the amps are meant to driver are my mids and my tweeters.

The input is AES/EBU and the source is a 6 channel Hypex DLCP DSP board.

And a word of advice, if anyone wants to try to cram this much stuff into such a small box... don't

I hope I never have to service it, if I have to I might just buy a new bigger box instead because I can't really access the the SMPSes without taking everything apart.
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Old 4th July 2015, 05:52 PM   #3283
Zen Mod is offline Zen Mod  Serbia
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witty

though , decent buffer in front of Semisouth wouldn't harm
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Old 4th July 2015, 05:57 PM   #3284
OllBoll is offline OllBoll  Sweden
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Quote:
Originally Posted by Zen Mod View Post
witty

though , decent buffer in front of Semisouth wouldn't harm
I thought about doing buffers, but as the output impedance on the DLCP is 100 ohm it should be OK without considering I don't have any passive volume management in between. I have some PCBs lying around for a BF862 powered B1-esque amp but never got around to assemble them as it should be overkill =)
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Old 12th July 2015, 07:39 AM   #3285
JamieMcC is offline JamieMcC  United Kingdom
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Pass ACA a 6W pair of single ended class A mono block power amps Pass designed to be simple and inexpensive to build. I wanted to try it with my Fostex FX120 speakers (in Fonken enclosures) and was also curious how it would work with the my HiFiman HE-6 headphones which are notoriously hard to drive.

I Purchased the pcb boards from diyaudio, won a large used heatsink on ebay which I cut down to make the two sides and used some offcuts of Zebrano wood for the enclosure.

Its up and running for a couple of days and is driving the Fostex FX120's really quiet nicely (2W tricked out SETs tube amp prior).

The HE6 headphones have been running off of the speaker taps also with excellent results. Next I'm going to try some tweaking and swapping out the electrolytic signal capacitors for some film ones and look at installing a passive attenuator.

The two mono block amp sections are in a single diy enclosure.

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Old 18th July 2015, 12:16 AM   #3286
dantwomey is offline dantwomey  Canada
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Default Balanced Ironamp

My sincere thanks to Michael Rothacher for his Ironamp design posted here.
Ironamp Video Posted

I just completed the balanced version and the sound is absolutely stunning. It is the VFET triode sound but significantly raises the bar over my L'Amp light bulb heater. Although I could use a better camera here are a few pics.

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Regards,
Dan
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Old 18th July 2015, 11:13 AM   #3287
Michael Rothacher is offline Michael Rothacher  United States
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Looking good, Dan And balanced too!
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Old 18th July 2015, 11:17 AM   #3288
Michael Rothacher is offline Michael Rothacher  United States
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One thing to check is the temperature of your devices to make sure the heat is adequately being communicated from those plates to the heat sinks. If you just measure the heat sink temperature it can give the comforting illusion that all is okay.

Love the meters. Tell us how it sounds once you've had a little time to listen
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Old 18th July 2015, 01:33 PM   #3289
Eric is offline Eric  United States
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Pictures of your diy Pass amplifier
Jamie: i just love that wooden chassis! I've been starting to focus on exotic woods to dress up the standard metal boxes.

Dan: cool tube- inspired design for a solid state amp! Reminds me of Mark Finnis' DIY A40 from 12 years or so ago that I found on the Pass website as I was building my A40 amp.
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Old 21st July 2015, 05:54 AM   #3290
sianturi is offline sianturi  Indonesia
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Quote:
Originally Posted by dantwomey View Post
My sincere thanks to Michael Rothacher for his Ironamp design posted here.
Ironamp Video Posted

I just completed the balanced version and the sound is absolutely stunning. It is the VFET triode sound but significantly raises the bar over my L'Amp light bulb heater. Although I could use a better camera here are a few pics.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Regards,
Dan
Hello dantwomey,
Where did you get the current meter from? It's so nice!
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