“Very true. But, after some time, however the sound is good, it becomes new norm and you start to wonder why it doesn’t/could it sound better.”
Exactly Tombo!!
And this is the reason the rabbit hole will never have a bottom. 😂
Enjoy your weekend Fellas!
Exactly Tombo!!
And this is the reason the rabbit hole will never have a bottom. 😂
Enjoy your weekend Fellas!
Of course, you are right. Once heard and appreciated it becomes the norm and the search begins again.
Now we anxiously await what you come up with next!
As it is I think this will keep me satisfied for a good year or so. Easily. Just like the longing look the character in Andy Partridge's EASTER THEATER received. (XTC Apple Venus)
My pre-amp is on all of the time so I figure it is warmed up - but I do think (I have no idea) if capacitors require actual musical signal going through them for awhile to sound their best? When I am listening to digital I can keep the signal going at all times but when I switch to phonograph (as I have for the last month or so) I do not have that luxury.
This phenomenon always brings to mind the great John Broskie and his question: does the gear settle in or do we? A question for which we will never get the definitive answer.
Take care,
Now we anxiously await what you come up with next!
As it is I think this will keep me satisfied for a good year or so. Easily. Just like the longing look the character in Andy Partridge's EASTER THEATER received. (XTC Apple Venus)
My pre-amp is on all of the time so I figure it is warmed up - but I do think (I have no idea) if capacitors require actual musical signal going through them for awhile to sound their best? When I am listening to digital I can keep the signal going at all times but when I switch to phonograph (as I have for the last month or so) I do not have that luxury.
This phenomenon always brings to mind the great John Broskie and his question: does the gear settle in or do we? A question for which we will never get the definitive answer.
Take care,
Hey tombo,
Thank you for this design - I received my boards today! Planning to use this supply for a Total Domination VFET Amp w/ the 2SK180 (haven't yet nailed down the exact supply voltage but probably around 32V at ~3A total for both channels.)
I was going to order the mouser cart just now and I noticed that Q8, the NPN transitor at the output, the TTC004B, is out of stock at Mouser.
It seems one or both of these would be suitable replacements based on the specs (same package, pinout, power dissipation, VCEO max, etc.) but wanted to run that by you first.
Would these be suitable substitutes?
Thanks,
Francis
Thank you for this design - I received my boards today! Planning to use this supply for a Total Domination VFET Amp w/ the 2SK180 (haven't yet nailed down the exact supply voltage but probably around 32V at ~3A total for both channels.)
I was going to order the mouser cart just now and I noticed that Q8, the NPN transitor at the output, the TTC004B, is out of stock at Mouser.
It seems one or both of these would be suitable replacements based on the specs (same package, pinout, power dissipation, VCEO max, etc.) but wanted to run that by you first.
Would these be suitable substitutes?
Thanks,
Francis
Digikey has thousands. Maybe split up your order between them? Or perhaps someone here could send you a few. 
As suggested, split your order if possible. Many parts would fit to make supply work without any apparent problem, but performance (as measured) wouldn’t be the same.
If there is enough place at the amplifier’s heatsinks, put supply there using it as a power MOSFET heatsink, as rickmcinnis has done. Or use some aluminium or copper bottom plate as a heat spreader to whatever is case metal bottom. I’m not happy with the price of heatsink from the BOM, but there was not any better available.
metaphile - I have extras I can mail you if you do not want to split your order and pay twice the freight.
Let me know.
Let me know.
The electronics equivalent of the axiom "no trip to Home Depot is complete without a second trip to Home Depot"
That would depend upon where you are!
In the southeast two days for MOUSER when the weather is not wintry.
MOUSER has sent packages recently from Canada next day air so I got a few the next day earlier in the month. I did not pay for next day air.
Conversely, usually four days for DIGIKEY in Georgia.
In the southeast two days for MOUSER when the weather is not wintry.
MOUSER has sent packages recently from Canada next day air so I got a few the next day earlier in the month. I did not pay for next day air.
Conversely, usually four days for DIGIKEY in Georgia.
Hi @tombo56,
I’m in the brainstorming planning phase for my XA252 build.
The psu will be using two pairs of R25 modules fed by a single Antek AN-10425. The trafo will mount vertically at the front of the chassis. My current idea is to mount one pair of R25 modules on a heatsink installed vertical ‘card’ style on an aluminum plate, two cards required. The psu baseplate will attach to the chassis baseplate by M4 10mm brass standoffs.
Feedback is always welcomed from all🙂
I have a couple questions…..
- C2’s are 22,000uF, 50V caps.
Would you recommend an additional 22mF in parallel for 44mF total per rail?
- The R25’s will be connected in series for bipolar output, what wiring method would be best practice?
1) jumper wire from bottom R25 V+ to top R25 V-, then use middle gnd faston for 0V to amp board?
2) connect bottom R25 V+ and top R25 V- directly to amp board?
I’m in the brainstorming planning phase for my XA252 build.
The psu will be using two pairs of R25 modules fed by a single Antek AN-10425. The trafo will mount vertically at the front of the chassis. My current idea is to mount one pair of R25 modules on a heatsink installed vertical ‘card’ style on an aluminum plate, two cards required. The psu baseplate will attach to the chassis baseplate by M4 10mm brass standoffs.
Feedback is always welcomed from all🙂
I have a couple questions…..
- C2’s are 22,000uF, 50V caps.
Would you recommend an additional 22mF in parallel for 44mF total per rail?
- The R25’s will be connected in series for bipolar output, what wiring method would be best practice?
1) jumper wire from bottom R25 V+ to top R25 V-, then use middle gnd faston for 0V to amp board?
2) connect bottom R25 V+ and top R25 V- directly to amp board?
Attachments
Lot of ‘real estate’ with those heatsinks. 🙂 I like your build plan.
Antek transformer will provide some 33-34V at the C2. I see your reason to go with the 50V capacitors. If Iq will be 1.7A, with 22 mF C2, ripple will be about 650 mVpp. Minimal allowed voltage drop, for full performance, will be then about 0.6 V. I think that no additional capacitance is required.
Connect supplies as proposed in option 1.
Antek transformer will provide some 33-34V at the C2. I see your reason to go with the 50V capacitors. If Iq will be 1.7A, with 22 mF C2, ripple will be about 650 mVpp. Minimal allowed voltage drop, for full performance, will be then about 0.6 V. I think that no additional capacitance is required.
Connect supplies as proposed in option 1.
Reading your build recommendations on post#1, I knew I was on the verge with the 22mF caps. 👍🏻
The heatsinks will be just shy of 180mm’s tall, R25’s won’t break a sweat.
Connection option #1 gives an additional faston tab for speaker return at the same location.(if needed)
Time to get cutting, drilling and tapping… Good times in -6°C temps 🥶
Thanks Tombo!
The heatsinks will be just shy of 180mm’s tall, R25’s won’t break a sweat.
Connection option #1 gives an additional faston tab for speaker return at the same location.(if needed)
Time to get cutting, drilling and tapping… Good times in -6°C temps 🥶
Thanks Tombo!
Made some progress on the R25 PSU this week.
Cutting, drilling and tapping of the aluminum material is completed.
Two of four R25 modules are completed and successfully powered up. The second pair is bare and waiting for more parts.
26VAC input
33V30 raw DC
31V40 regulated output with 500mA load.
Q6 gets a bit warm and will get a heatsink, Q5 can stay naked.
More to come…..
Cutting, drilling and tapping of the aluminum material is completed.
Two of four R25 modules are completed and successfully powered up. The second pair is bare and waiting for more parts.
26VAC input
33V30 raw DC
31V40 regulated output with 500mA load.
Q6 gets a bit warm and will get a heatsink, Q5 can stay naked.
More to come…..
Attachments
Well done Vunce, you are always looking for new ways to improve the build, improve the chassis design and make it easier overall.
Ha, I see there an appropriate solution for a guy with few amplifier builds per year. 🙂
You can easily move supply module from build to build, and it doesn’t take too much space. 👍