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Old 2nd March 2020, 08:33 PM   #5021
Todd Mills is offline Todd Mills  Canada
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Thanks Guys

6L6 - The amp sounds smooth with really great bass.
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Old 3rd March 2020, 11:39 AM   #5022
thompsontechs is offline thompsontechs  United States
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Nice work Todd!


JT
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Old 17th March 2020, 05:31 PM   #5023
TungstenAudio is offline TungstenAudio  United States
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Default "Penultimate" Zen V4

This is still a work in progress. There are challenges to using these particular PCBs, which are not well documented. I really wish there were good boards available from the store.
Transformers are from some of the old Hafler amplifiers that I've collected over the years. Unloaded secondary voltage is 48V, and they exhibit some sag when under ~ 2A quiescent current load. Internal regulated rail voltage ends up being 47.7V, with a zener diode stack totaling 51.8V. Using IRFP150 in the regulator and current source positions, FQH44N10 in the signal amplifier position.
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File Type: jpg Zen V4 work.jpg (408.1 KB, 701 views)
File Type: jpg Zen V4 ext.jpg (401.9 KB, 692 views)

Last edited by TungstenAudio; 17th March 2020 at 05:34 PM.
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Old 22nd March 2020, 06:25 PM   #5024
elwood625 is offline elwood625  United States
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Between Covid-19 and winter weather that won't go away, I've had time to finish projects I started awhile ago.
First up, was the stereo ACA v1.6 using premium parts, I used the schematic and parts list from TungstenAudio. Using an old Hafler DH-200 amp, I gutted and cleaned the enclosure and used it for the ACA. Without the massive transformer inside the enclosure, it was far to light weight, along with holes in the bottom from all the Hafler parts installed. So I used sound deadening material from 3M, peel and stick about 4mm thick, I cut two pieces for each side of the lower panel, added heft and quieted the inside of the enclosure.
I'm using a Meanwell power supply (24v 6.5A) from Parts Express, with a voltage adjustment I dialed in 24 vdc.
I kept one of the "speaker" fuse holder for the 115 vac line. The on-off switch is illuminated red when on, instead I'm using the amber "overheat" lamp for an indicator. (I've owned these amps since 1979 and only once did I ever see the ambler light go on.) The other fuse holder position I used for the mono-stereo bridge switch.
Of course, each PCB has a blue LED which are visible from the top and bottom through the vent holes.
The amp is about 8 hours old now and playing music for the next couple of days to break it in.
Photos show the ACA version on top of an original Hafler DH-200.
Attached Images
File Type: jpg IMG_1300.JPG (93.6 KB, 478 views)
File Type: jpg IMG_1301.JPG (132.4 KB, 475 views)
File Type: jpg IMG_1302.JPG (112.0 KB, 461 views)
File Type: jpg IMG_1303.JPG (101.8 KB, 204 views)
File Type: jpg IMG_1304.JPG (94.6 KB, 202 views)
File Type: jpg IMG_1305.JPG (65.6 KB, 187 views)
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ACA v1.6 monoblocks, Balanced Zen Line Stage, M2x, Aleph J, H2, B1 Korg triode, 12AX7a Phono amplifier, Balanced B1 Korg triode, 6FG6 "Magic Eye" tube VU meter
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Old 22nd March 2020, 07:01 PM   #5025
TungstenAudio is offline TungstenAudio  United States
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That's a good looking ACA build. I love the clean lines of the old DH-200 chassis. I have one or two of those lurking around as well. Looks like you found a good way to mount the boards. The amp is definitely lighter with the SMPS inside instead of the big iron transformer.

There is a variation of a capacitance multiplier which can be used as a soft start to allow a large bulk capacitor to be used after the SMPS on the power rail. Look for the Mr Evil / PMI cap multiplier in the power supply forum. Jason Kuetemann has a slightly simplified version as well. Since this uses a P-channel Mosfet, it may be adjusted for a low dropout of ~1 Volt or a little less. The MeanWell SMPS can be adjusted to compensate for the dropout to keep your amp's rail voltage the same.
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Old 26th March 2020, 06:45 AM   #5026
batty is offline batty  Australia
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Location: Adelaide, South Australia
This is my PASS PC audio stack.
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File Type: jpg Rand (11).jpg (980.4 KB, 214 views)
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I have gone from 85 watts class AB amplification to an ACA.Gone on to the M2X.
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Old 26th March 2020, 12:07 PM   #5027
Mod Man is offline Mod Man  United States
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Aint it fun.
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Old 26th March 2020, 02:11 PM   #5028
thompsontechs is offline thompsontechs  United States
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Sweet!
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Old 26th March 2020, 10:56 PM   #5029
zman01 is offline zman01  Bangladesh
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Pictures of your diy Pass amplifier
Nice collection batty!
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