So true Andy,
I never see the clip light and my ears would ring for a week if I listened to them that loud. It all goes back to my child hood when I built my first space capsule in my lower bunk, it incorporated any kind of blinking light or meter I could round up. I have not forgotten about your speakers and would like to discuss them with you at some point. What was the forum you mentioned you had discussed them on?
Bill
I never see the clip light and my ears would ring for a week if I listened to them that loud. It all goes back to my child hood when I built my first space capsule in my lower bunk, it incorporated any kind of blinking light or meter I could round up. I have not forgotten about your speakers and would like to discuss them with you at some point. What was the forum you mentioned you had discussed them on?
Bill
Hi Bill,
There's a thread here:
The spkrs which are replacing my Maggies - DIY Audio Projects - StereoNET International
Andy
Heya nerds! I'm struggling a little to find adequate price friendly alternatives for some of the transistors like the TCC and alike. Would anyone like to chip in some ideas? I use mostly LCSC because that's where I buy most of my Asian brand devices; Semtech and TyOhm are my go-to's from Asia.
't Would also be appreciated if someone knew whether changing between these transistors is going to need adjustments to any values of resistors!
KSA992FTA
KSC3503DS
TTC004B
BD140
For the KSA992, I am able to readily source the 2n5401. Its complementary part 2n5551 is also readily available for me, but I know those might not have adequate power dissipation without any modifications..
The BD140 is available, but very expensive in my margins.
For the TTC004B I can currently not find an alternative that is near enough drop in replacement compatible that is also in stock. So this one might need some modifications to the board and circuit, which is no huge deal for me luckily (as long as I know what to change!)
I see in the 20watt model, a lot of these have been changed to lower power parts (obviously) that are way different in name than the ones used in the 39 watt version, which makes me think I also may have some leeway in terms of parts themselves.
I do have an LCR meter to hand I can use to measure hFE. That's why I like to buy more of a cheaper part, to pick out the best performer in class.
Cheers!
't Would also be appreciated if someone knew whether changing between these transistors is going to need adjustments to any values of resistors!
KSA992FTA
KSC3503DS
TTC004B
BD140
For the KSA992, I am able to readily source the 2n5401. Its complementary part 2n5551 is also readily available for me, but I know those might not have adequate power dissipation without any modifications..
The BD140 is available, but very expensive in my margins.
For the TTC004B I can currently not find an alternative that is near enough drop in replacement compatible that is also in stock. So this one might need some modifications to the board and circuit, which is no huge deal for me luckily (as long as I know what to change!)
I see in the 20watt model, a lot of these have been changed to lower power parts (obviously) that are way different in name than the ones used in the 39 watt version, which makes me think I also may have some leeway in terms of parts themselves.
I do have an LCR meter to hand I can use to measure hFE. That's why I like to buy more of a cheaper part, to pick out the best performer in class.
Cheers!
It is ironic the project started out as a no exotic parts needed. The supply chain for even common through hole components has been drying up pretty quickly. I am thinking of future projects and attempting to stockpile parts while they are still available. At the same time I am developing my scolding skills for surface mount components.
Bill
Bill
I do like that typo... "Scolding skills". Is that such a prevalent skill to need here over on diyaudio? 😛
Edit: since there were relatively common and non exotic parts to begin with when first developed I am relatively certain it should be possible to adapt the design. I do need to make sure I order the right parts to experiment though. I want to build a higher power Class A amp for a friend who wants one, and the AlphaNirvana amp is pretty much exactly what we need - minus the lack of available PCB-files (which is understandable if that's your business.)
Edit: since there were relatively common and non exotic parts to begin with when first developed I am relatively certain it should be possible to adapt the design. I do need to make sure I order the right parts to experiment though. I want to build a higher power Class A amp for a friend who wants one, and the AlphaNirvana amp is pretty much exactly what we need - minus the lack of available PCB-files (which is understandable if that's your business.)
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I guess it is if you rely on subjective results. Some times I think Apple changes spelling just to screw with me. It is a really nice design and in my case the power output versus heat output works quite well, most of my Class A amps my wife has concerned about roasting the cat (she - the cat loves anything warm).
Bill
Bill
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Absolutely. I find that it is very necessary to scold with great care and deliberation with smd components. They are extremely badly behaved. I thought after my children growing up I never have to do this again..........
HD
Especially those MELFs - they like to fly out of your tweezers and onto the floor.
For alternatives, I think this amp is fairly tolerant of parts swapping as long as voltages, current capability, and gain are about the same. Observe the legs (pin out orientation).
For alternatives, I think this amp is fairly tolerant of parts swapping as long as voltages, current capability, and gain are about the same. Observe the legs (pin out orientation).
Hey folks, not sure how many of you frequent Pass Forum so I thought I would do a little cross pollination. I just verified with measurements today that I was able to eek out 100w of SE Class A power (89.7Vpp) into a 10ohm load from a single rail at 27.6v. It’s a balanced output amp using a balanced choke load to get thermal efficiency up to 60% in pure Class A operation.
More here:
SuSyLu Where Are You?
Schematic:
This amp is based on two of these LuFo amps in BTL operation:
LuFo Amp - 39w SE Class A from 28v Rail
More here:
SuSyLu Where Are You?
Schematic:
This amp is based on two of these LuFo amps in BTL operation:
LuFo Amp - 39w SE Class A from 28v Rail
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Wow X thats impressive That will no doubt be a popular build hope your planning a simple build guide ?
How would you compare sound to other similar amps ?
How would you compare sound to other similar amps ?
I only have heard it in mono, but from what I hear, it’s very dynamic with gobs of cone slapping bass. Much like a powerful Class AB in grunt and even the way it plays rock music. It’s unlike any SE Class A I have heard before - which I would say tends to be more “polite”. 🙂
If there is enough interest I could make a basic guide. I generally don’t do detailed build guides. This amp is actually quite simple to construct. The trick is going to be getting the balanced choke. You can always build the 40w SE version which also sounds excellent.
You can listen to a couple of test tracks where I was testing bass dynamics here:
SuSyLu test of bass dynamics - YouTube
SuSyLu test of Hey Now infrasonic bass - YouTube
If there is enough interest I could make a basic guide. I generally don’t do detailed build guides. This amp is actually quite simple to construct. The trick is going to be getting the balanced choke. You can always build the 40w SE version which also sounds excellent.
You can listen to a couple of test tracks where I was testing bass dynamics here:
SuSyLu test of bass dynamics - YouTube
SuSyLu test of Hey Now infrasonic bass - YouTube
Im still trying to get parts for your SLB as your noise figures would be with the components you used. but this build seems to take things to a new level ill follow with great interest, all the best.
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Hi Awc,
Please post further questions about that amp in the SuSyLu or LuFo thread. Sorry for the OT posts.
Back to regular programming on Alpha Nirvana.
Please post further questions about that amp in the SuSyLu or LuFo thread. Sorry for the OT posts.
Back to regular programming on Alpha Nirvana.
Perhaps you might like to tell us which particular amp you are talking about, mate?
Andy
That should be clear to anyone able to read in the right context (which seems to be a vanishing skill...), but, to help you out mate, it's about the amp X refers to in #1749.
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Let’s not do this again Daanve. Each half of the core amp is a LuFo and SE Class A. The load (speaker) is being driven antiphase by two SE Class A cores, and in balanced operation, the load is in push pull.
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Who cares?
I don't`care.
Call it whatever you want, A, B, C... use the whole alphabet if needed.
The main thing is the sound and to some degree the efficiency.
Danvee, didn't you start your own thread about definition of different classes in amps?
I don't`care.
Call it whatever you want, A, B, C... use the whole alphabet if needed.
The main thing is the sound and to some degree the efficiency.
Danvee, didn't you start your own thread about definition of different classes in amps?