I have my own thumb of rule
for FW format amps, be it dual mono or monoblock, here is what I'm using per channel:
mains fuse, mains NTC, 300VA Donut, dual 18Vac secondaries, two metal 50A Graetz bridges, then 33mF-0R1/5W-33mF per rail ; when I have space, adding motor-run 50uF caps as bypass for final 33mF, so that's one per rail
when going wild and building for my self and having space, hefty Iron Choke instead of R in CRC
here's my ultimate outfit, having proper Role Models in life is important
Attachments
And a second follow up: CLC is not your fav, ZM, right? CRC or CRCC is more to your liking in power amps. Why? Does the inductor impede current? Not cost effective? (Sorry, saw your post abput CLC now, I must have misunderstood in the past, read some posts, but maybe you just commented on high inductance chokes! I did not know high inductance was a problem as long as DCR is kept low).
And the big one: choke input supply. Is this a go to? Much more complex, of course, but much happier and smoother ripple, muchos nice for sound. But dynamics? Current? Cost? Weight? Also needs DC free AC...
And the big one: choke input supply. Is this a go to? Much more complex, of course, but much happier and smoother ripple, muchos nice for sound. But dynamics? Current? Cost? Weight? Also needs DC free AC...
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XA incarnations of mine are getting pushed on back of list, constantly ...... main reason..... probably that I'm 99% sure it'll work, while I'm constantly getting some other ideas, itching in much greater amount, and I can't refrain from scratching
there was one Babelfish XA25 iteration planned ...... now I have 2 ........... which is 3
I already have sort of XA Baby, called Babelfish M25, and I just finished (damn! final!) R.2 of that amp; it's sorta love child between FW M2 and PL XA25, or as I'm calling it - Berserker M25; regular 25-W-ish at 8R and nearly 50W at 4R, but due to lack of source resistors, A Class envelope at 4R is almost 40W
regarding 12R speakers ; my main speakers are 16R
rumor sez that Papa's SIT-3, when paired with (highish Ohms) Zu spks , is simply opening your third eye, if you connect additional power resistor in parallel with speaker, so amp is seeing 8-ish Ohm load
with my speakers (extreme easy load in every manner) , I couldn't hear important difference neither with DEFiSIT nor with my T-BED bedded SIT-3 specimen (when I had it, for month or so)
buy proper speakers, and whatever you throw at them, it'll sing, without too much brain power invested
I've told ya how to reach Audiophile Retirement, regarding speakers, in some PMs we had
I would love that retirement. But not so high WAF with my wife at least. And still havent found a decebt pair of Tannoys at a decent price. They are INSANELY scarce and pricey!
choke input filter is reserved for amps where you go wild up to extreme
I believe I'll do something in that manner for SIT-1, I'm obliged to build
plenty of details must be taken in account and solving them easy is possible only if you're building big - if filter is unloaded during startup, one must use caps with enormous voltage rating ........ which means not just $$ but space for caps, too
etc.
as I said - CLC is my fave (meaning I like it more than CRC) but only when sufficient sized chokes used; tots are not allowed, especially not 2mH speaker air chokes.......... more problems than benefits
chokes with benefit
Going back to the twiddle, put cover on, remove cover and twiddle some more......
I wonder if a person could use pots with the screw on side facing the cover then drill holes on the cover through which a person could pass non-conductive rf adjustment tools to tweek the pots. The meter wires could come out with the cover gently resting on them. Just a thought.
I wonder if a person could use pots with the screw on side facing the cover then drill holes on the cover through which a person could pass non-conductive rf adjustment tools to tweek the pots. The meter wires could come out with the cover gently resting on them. Just a thought.
not worth the hassle
just be patient with already explained routine
use paper tape to mask cover edges temporary, to preserve everything from scratching
you can also make pulling ears of same tape
just be patient with already explained routine
use paper tape to mask cover edges temporary, to preserve everything from scratching
you can also make pulling ears of same tape
I have used PSUD to simulate CLC. But what is the thing/problem with air cores? I don’t get it. Some say use air cores to avoid saturation. Some say use 10mh on FW, Nelson says 2,5-4mh.
You say Iron and not air core. I of course trust Papa and you, but could you please enlighten me on:
1: Why use Iron instead of air core? What to look out for when choosing? Can you link to an inductor you would use for FW applications? Hammond 159 series? Or even simpler, pure iton like Sean Connerys arms? Dennis recommends I try the Hammond, and it is gheap so I think I will. But 2mh or 10?
2: why use 2,5-4mh and not 10mh?
Low DCR means more chance pf ringing, but this can be solved with thermistor or resistor in parallell. But what DCR to target?
I will buy the Connery outfit and post a winter pic of myself in it, mounain view style.
Greetings from the mountains!
You say Iron and not air core. I of course trust Papa and you, but could you please enlighten me on:
1: Why use Iron instead of air core? What to look out for when choosing? Can you link to an inductor you would use for FW applications? Hammond 159 series? Or even simpler, pure iton like Sean Connerys arms? Dennis recommends I try the Hammond, and it is gheap so I think I will. But 2mh or 10?
2: why use 2,5-4mh and not 10mh?
Low DCR means more chance pf ringing, but this can be solved with thermistor or resistor in parallell. But what DCR to target?
I will buy the Connery outfit and post a winter pic of myself in it, mounain view style.
Greetings from the mountains!
Been trying to read and learn, but not everything is answered. Maybe it’s just me... but these are interesting:
Parallel Thermistors
CRCRC vs. LCLCLC which is better and why?
Choke or Capacitor Input? (love this one from the 50’s!)
Type of Choke for CLC?
SIT1 Choke Input Power Supply?
Parallel Thermistors
CRCRC vs. LCLCLC which is better and why?
Choke or Capacitor Input? (love this one from the 50’s!)
Type of Choke for CLC?
SIT1 Choke Input Power Supply?
"Dissipation => 0V235 / 0R47 => 0A5*3 current vertical paths (each carrying 0A5) * (24Vdc *2) =72W
in some cases , keeping with principle can save you from omissions"
Thank you!
I will buy the Connery outfit and post a winter pic of myself in it, mounain view style.
in some cases , keeping with principle can save you from omissions"
Thank you!
I will buy the Connery outfit and post a winter pic of myself in it, mounain view style.
I believe Sean Connery must have used inductors. When he plugged in, the result was often good, warm and extended high frequency response, and pleasing bottom ends.
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damn, stop editing, now I must reply again
You are right. My «8R» speakers dip to 3-3,5 in the whole bass region, with some ludicrous impedance dips. Been looking at Zu Dirty weekend used. Easier speakers=less brain power required, I agree.
Sissy going for finished speaker. But no time to learn new things right now (building speakers and all). Future long term plan is open baffles, would be really cool.
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OB
0 WAF
or, in my case - Absolute WAF
(soon to be changed to big TL boxes, either that or to make bigger baffles (was lazy so found a way to get boxes as tick for tack job)
0 WAF
or, in my case - Absolute WAF
(soon to be changed to big TL boxes, either that or to make bigger baffles (was lazy so found a way to get boxes as tick for tack job)
Or in my case: no speaker is ultimate WAF. Maybe invisible is the way to go.
She would probably like this: The Invisible Speaker Company - Amina UK
Maybe if I do a Zardos on the misses she will accept OB’s. One Zardos night for every month of fugly speakers in house.
I would like to try these: https://www.firstwatt.com/pdf/art_slob.pdf
And yours!
She would probably like this: The Invisible Speaker Company - Amina UK
Maybe if I do a Zardos on the misses she will accept OB’s. One Zardos night for every month of fugly speakers in house.
I would like to try these: https://www.firstwatt.com/pdf/art_slob.pdf
And yours!
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your inbox is flooded
so - Al is material of choice, Fe - didn't even think of
take in account that pole material of screw contacts (computer grade caps) is Al actually....... so no brainer
wise to avoid copper plates there, two enough diff materials, expecting contact problems in time, due to some chemical processes, of which I'm totally ignorant