Al's schematic (#531) is using 2SC 2500s in the OPS. So is Sound Buster.(#532)
Hmm...'wonder if those improved sound quality in any sims. there?
Greg,you are not alone, suffering with electrolexia!
Hmm...'wonder if those improved sound quality in any sims. there?
Greg,you are not alone, suffering with electrolexia!
OS,
You have far too much energy. I want some.
I have always built AKSAs with twin, independent power supplies for the very reason you identify. Improves crosstalk, and thereby, imaging.
Hugh
You have far too much energy. I want some.
I have always built AKSAs with twin, independent power supplies for the very reason you identify. Improves crosstalk, and thereby, imaging.
Hugh
That's a oxymoron if I ever heard one ! 😀
Realistically , the on- semi (njw/mjl's) models will give the lowest PPM in a typical "blameless" simulation.
I am using a new pair (Sanken 2sc3263/2sa1294- below 1) , I could say they "sound better" but I know better .... they are just better matched and are especially made for audio.
These fine pieces of sand are nearly identical to 2sc5200's with a slightly higher SOA @60V.
OS
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If I could only trade energy for $$ , I'd be rich.. 😀
#2 in my above PSRR examples will match a dual supply with a lowly single supply. (in listening .. too 🙂 )
The 3'rd one is just pure overkill as far as listening goes. Can't discern the improvement , but what the hell
.Listening to a lot of classic rock , the L - R imaging is very apparent ... they "play with your head" in this genre (YES , Alan Parsons, Floyd) . A low PSRR main amp will be "unconvincing" when compared to a good highly regulated headphone amp. You have 2 choices ... design a VERY high PSRR amp to match with the cheap single supply (OEM style) , or augment the lower PSRR with cap multipliers or dual supplies. I opt to use both methods.
Dual supplies with multipliers (for the IPS/VAS) would be "the cat's meow" 🙂🙂
OS
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I have a plan to make a power supply with single 20A EI transformer, in a separated wooden cabinet that will act as a "table" for my amps (4 or 6 channels). Beside the ease of operation when the heavy PS is "in the table", this way I separate the signal from the nasty PS interference. Later I was thinking about buying another 20A for dual supply. But now I think I have to abort that plan 🙁
I know mine are NOT , pushed a single pair to 80W for hours. Besides breaking them open you would have to do this. If you DO break one open , a genuine one will have 6-7mm die , a fake will have a 3-4mm die. 🙁
One one right is fake. (actually both are fake)
OS
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Good source of genuine Sanken OTs
Hi OS,
It is OOT but I could not resist.
I bought a broken Yamaha AV amp from eBay for $20 last week. The amp does not power on, I suspected that the standby power transformer is broken, however the main Transformer is tested OK, so is the main filter capacitor.
The spec of this amp (HTR-5840) says it is rated at 6x 85W RMS.
Inside the Yamaha is 6 pairs (12 pieces) of these Sanken babies. I reckoned it is a good buy for 20 bucks and it will be my next project - retrofit this amp with some decent diy boards.
Your A1294/C3263 are better than the Sanken in my Yamaha, it is LAPT (Multi emitter for High Frequency) and higher power & Ic. The fonts on your Sanken is similar to mine, so it is a good indicator.
Cheers, Stanley
Hi OS,
It is OOT but I could not resist.
I bought a broken Yamaha AV amp from eBay for $20 last week. The amp does not power on, I suspected that the standby power transformer is broken, however the main Transformer is tested OK, so is the main filter capacitor.
The spec of this amp (HTR-5840) says it is rated at 6x 85W RMS.
Inside the Yamaha is 6 pairs (12 pieces) of these Sanken babies. I reckoned it is a good buy for 20 bucks and it will be my next project - retrofit this amp with some decent diy boards.
Your A1294/C3263 are better than the Sanken in my Yamaha, it is LAPT (Multi emitter for High Frequency) and higher power & Ic. The fonts on your Sanken is similar to mine, so it is a good indicator.
Cheers, Stanley
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At the local price of even these MT100 Sankens, I'm surprised any OEMs used them.
Especially not as they often were even in "budget" music centre bass channels.
Whether for the BAKSA or any small amp, Os, what are you expected to pay for those in the US?.
Especially not as they often were even in "budget" music centre bass channels.
Whether for the BAKSA or any small amp, Os, what are you expected to pay for those in the US?.
Hi Bigun,
Then your TGM1 is nearly identical to an 8 year old AKSA.
The latest AKSA schematics are probably closer to Hugh's AKSA 100 than the AKSA 55. I have never seen the AKSA 100 schematic so I can't be sure.
regards
Hi ostripper,
I think I mentioned earlier in the thread that I intend to try the JLH ripple eaters on the front end. Anyway, here is a page of things I intend to try.
http://users.tpg.com.au/gerskine/greg/b-aksa 55-07.htm
Here's the info on the JLH ripple eaters. They do have a cap multiplier on the output. These are already designed built and tested by numerous people locally and internationally. sandyK for example has been using them for at least 5 years (probably longer). As far a I know no one has used them on AKSA style amps.
http://users.tpg.com.au/gerskine/greg/jlh add-on shunt regulator.htm
regards
$2.37USD at Newark for both sexes. About the same as my favorite on- semi NJW0281/0302's @ mouser. 😎
MT (100-200) packaging is overpriced , I did not know this .. but a mt-200 is just a repackaged to-3p (below) that they charge wayyyyy too much for. I have replaced mt-200's with on's NJW line , just drill the holes. 🙂
OS
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I just checked the au.element14.com, the Australian arm of the old Farnell/Newark. Element14 charge A$11.22 each, now A$ worth more than US$, which means that we always pay much more for electronic components.
ALLEGRO SANKEN|2SA1294|TRANSISTOR, PNP, TO-3P | element14 Australia
Nico RAS uses his own version of "ripple eaters" in his amps. You don't need anything that serious for this amp. I use a C-R-C for my drivers , the cap mult's for my IPS/VAS (all fed from a separate 68-0-68V supply). Even with 2v or more ripple on the "dirty" OPS supply ,(which NFB takes care of nicely) , I can get close to the 3'rd (-120+ db PSRR) plot I posted before.
Output stages can take "dirty" rails , input stages like clean ripple- free environments. The power supply is just as important as the design of the amp.
Below 1 is the simple multiplier schematic - pix 2 is the CRC (68-0-68v)... The "dirty" 60v OPS supply is behind it. 😀
All works nice with a 55 or my BX (similar bootstrap amp)
OS
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After magnifying your pic to better see the details on those parts, I can say they are genuine. I would buy them all at that price, 😉