Looks like I depended upon my memory. Embarrassed SORRY for the one thousandth time.
Just measured the second amp - the first one is underneath so not easy to get to -
473 mV across the resistors and Vgs of 37.
Now to see what a proper wiring arrangement might do to those numbers.
Now to rearrange the power supply wiring ...
Just measured the second amp - the first one is underneath so not easy to get to -
473 mV across the resistors and Vgs of 37.
Now to see what a proper wiring arrangement might do to those numbers.
Now to rearrange the power supply wiring ...
Silence is Serbian.
Who needs gold when there are exceedingly clever, cunning, wise and generous beyond my ability to express.
Did the second amp first. too azy to convert but ther is 477 mV across the reisostor stack and Vgs has been set to 37.
Now on to the second amp. Should go much quicker since I know what to so.
With inflation I must say thanks a trillion.
Who needs gold when there are exceedingly clever, cunning, wise and generous beyond my ability to express.
Did the second amp first. too azy to convert but ther is 477 mV across the reisostor stack and Vgs has been set to 37.
Now on to the second amp. Should go much quicker since I know what to so.
With inflation I must say thanks a trillion.
Amp two which handles the Celestion driver is absolutely quiet.
Amp one which handles the two woofers still has a faint buzz - much better than it was.
It allows a 460 mV across the resistors but requires 38 volts Vgs to get there.
No question this supply sounds better.
Incredible sounding amplifiers.
Now to get to work on 3 and 4 - hoping that reveals where I went wrong with the noise aspect.
Amp one which handles the two woofers still has a faint buzz - much better than it was.
It allows a 460 mV across the resistors but requires 38 volts Vgs to get there.
No question this supply sounds better.
Incredible sounding amplifiers.
Now to get to work on 3 and 4 - hoping that reveals where I went wrong with the noise aspect.
I am using the AXI2050.
I wrote a usually too long note that disappeared right in front of my eyes.
Here is a picture of the system.
It is based upon Chris A's Klipsch K402 MEH.
They are the best compression drivers I have ever heard and I have owned many of the highly regarded ones.
The SINGING BUSH loves both the CELESTION and the CRITES/EMINENCE woofers.
If more details are wanted let me know.
None of my amp pictures were of any use so i will try again tonight.
I wrote a usually too long note that disappeared right in front of my eyes.
Here is a picture of the system.
It is based upon Chris A's Klipsch K402 MEH.
They are the best compression drivers I have ever heard and I have owned many of the highly regarded ones.
The SINGING BUSH loves both the CELESTION and the CRITES/EMINENCE woofers.
If more details are wanted let me know.
None of my amp pictures were of any use so i will try again tonight.
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ZM,
Last night after the pair got warmed up, even though with Fall here, they are hardly even warm - but the time does make a difference - the sound was mesmerizing. The extra dynamism of the SB is the key to this step closer to life.
I have yet to hear any ill effects from your yellow caps. I felt sure they would make themselves known but that is hardly the case. My audiokook alternate personality cannot imagine polycarbonate based caps being any good.
I figure on the buzzy amp I have a bad solder joint in the ground somewhere. Will go over it again this afternoon. Though the buzz has no bearing on the sound quality.
No question your supply scheme DOES!
Thanks again. That makes one trillion and one.
Last night after the pair got warmed up, even though with Fall here, they are hardly even warm - but the time does make a difference - the sound was mesmerizing. The extra dynamism of the SB is the key to this step closer to life.
I have yet to hear any ill effects from your yellow caps. I felt sure they would make themselves known but that is hardly the case. My audiokook alternate personality cannot imagine polycarbonate based caps being any good.
I figure on the buzzy amp I have a bad solder joint in the ground somewhere. Will go over it again this afternoon. Though the buzz has no bearing on the sound quality.
No question your supply scheme DOES!
Thanks again. That makes one trillion and one.
you can use cap bank pcbs I sent you (4pcs I believe) for single rail
I can sketch how, and you'll get even easier wiring scheme, while superior to your fat wire mess
problem with fat is starting with need for proper solder - 8-10mm thick tip, flat knife-like end, 60W min.
temp. inertia you get with massive tip is equally important as power in Watts
further - everything needs to be done in way that cap electrodes/pins are not excessively heated - fast and furious, potent soldering job is what is needed
if soldering isn't made that way, there are contact ...... or even bad cap troubles
I can sketch how, and you'll get even easier wiring scheme, while superior to your fat wire mess
problem with fat is starting with need for proper solder - 8-10mm thick tip, flat knife-like end, 60W min.
temp. inertia you get with massive tip is equally important as power in Watts
further - everything needs to be done in way that cap electrodes/pins are not excessively heated - fast and furious, potent soldering job is what is needed
if soldering isn't made that way, there are contact ...... or even bad cap troubles
Do you think those number are good?
What would I do to raise the Iq in amp #2?
Is 38 volts Vgs acceptable in amp #1?
What would I do to raise the Iq in amp #2?
Is 38 volts Vgs acceptable in amp #1?
Yes, I have had that same concern -
I did get two of your cap boards - I could use the two of them on the noisy amp and HEAR where that gets me.
As i was making those joints I would monitor the cap case temperature which I feel sure has little to do with what is happening in the center.
In fact I was wondering if I had/have ruined or diminished them in the process?
I think that is what I will do this evening - it is obvious that is what the problem is.
If that cures the problem i will need to order four more of them.
The amp that is working well - it makes as much noise when it is off - I should leave it alone. I will probably, as I type and think, go ahead and get boards for it in case things go wrong.
Compromise is always there and perfection seems podsible but there are lots of small things that get in the way. Though one has to try so you will not wonder later, WHAT IF?
I think of the great observation of Salvador Dali (which i have repeated many times since I think it needs to be heard) "Do not fear perfection, you will never achieve it".
So one should try to find perfection just not be disappointed when they find it has moved to another town.
Thanks AGAIN for the wise counsel and the gentle prodding.
I did get two of your cap boards - I could use the two of them on the noisy amp and HEAR where that gets me.
As i was making those joints I would monitor the cap case temperature which I feel sure has little to do with what is happening in the center.
In fact I was wondering if I had/have ruined or diminished them in the process?
I think that is what I will do this evening - it is obvious that is what the problem is.
If that cures the problem i will need to order four more of them.
The amp that is working well - it makes as much noise when it is off - I should leave it alone. I will probably, as I type and think, go ahead and get boards for it in case things go wrong.
Compromise is always there and perfection seems podsible but there are lots of small things that get in the way. Though one has to try so you will not wonder later, WHAT IF?
I think of the great observation of Salvador Dali (which i have repeated many times since I think it needs to be heard) "Do not fear perfection, you will never achieve it".
So one should try to find perfection just not be disappointed when they find it has moved to another town.
Thanks AGAIN for the wise counsel and the gentle prodding.
Glad you’re happy with SB, Rick! I was out of town for a few days and couldn’t wait to get back home and listen to mine again. Truly exceptional amplifiers.
first, you need to make me a list for each of 4 channels you have:
1. what is max Iq you can set
2. what is a range you can set output node voltage, ref. to GND
the I can tell specifically what's needed to be done - resistor value change here and there ( everything being in conjunction with border Ugs of either SIT or Mosfet, preventing setting of Kosher value)
will make sketch for you , to use present Cap Bank pcbs
be patient some time, need to feed coffee maker
ahem - codyt lucky bstrd, got newest toy amp on Raffle
1. what is max Iq you can set
2. what is a range you can set output node voltage, ref. to GND
the I can tell specifically what's needed to be done - resistor value change here and there ( everything being in conjunction with border Ugs of either SIT or Mosfet, preventing setting of Kosher value)
will make sketch for you , to use present Cap Bank pcbs
be patient some time, need to feed coffee maker
ahem - codyt lucky bstrd, got newest toy amp on Raffle
counting on fact that PSU arrangement is as we already have shown above - 4 caps, choke, 4 caps, this is it
route every wire as shown
no need to use wire fatter than 2.5mmsq ; gauge that
if you have them ( and I believe I've sent Plethora of these to you), use needle connector ends - neater and better; toss plastic junk from them , crimp gently, solder wire in connector, solder in pcb
lower two caps on pcb - orient them as shown in pic
short R positions on pcb, one up, one down
if something is not clear, say
cap bank pcb render , for reference
my Singing Bush will have same filter pcb arrangement, even if I'm going to have for start "just" (10mF//10mF)-9mH (0R2Rdc)-(10mF//10mF)
route every wire as shown
no need to use wire fatter than 2.5mmsq ; gauge that
if you have them ( and I believe I've sent Plethora of these to you), use needle connector ends - neater and better; toss plastic junk from them , crimp gently, solder wire in connector, solder in pcb
lower two caps on pcb - orient them as shown in pic
short R positions on pcb, one up, one down
if something is not clear, say
cap bank pcb render , for reference
my Singing Bush will have same filter pcb arrangement, even if I'm going to have for start "just" (10mF//10mF)-9mH (0R2Rdc)-(10mF//10mF)
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First off, Cody I would love to hear what your 77B SINGING BUSH can do!
ZM, only two amps are in existence at the moment.
I am beginning the build of the last two today. I figure about two weeks. Taking apart two DYNACO 400s to get the heat sinks. Have some parts to order.
I have four of the cap boards so i would need 12 more . Send me an email or a PAYPAL request, please. I may have only two - I ned to take a look.
I keep wondering - since I used the absurd 8 gauge wire thinking it would give a dynamic advantage to the amps it will be interesting to hear with the PCBs if anything is lost. These things are very micro and macrodynamoic and, of course, expectation bias reigns supreme.
I will know better tonight.
Take care,
ZM, only two amps are in existence at the moment.
I am beginning the build of the last two today. I figure about two weeks. Taking apart two DYNACO 400s to get the heat sinks. Have some parts to order.
I have four of the cap boards so i would need 12 more . Send me an email or a PAYPAL request, please. I may have only two - I ned to take a look.
I keep wondering - since I used the absurd 8 gauge wire thinking it would give a dynamic advantage to the amps it will be interesting to hear with the PCBs if anything is lost. These things are very micro and macrodynamoic and, of course, expectation bias reigns supreme.
I will know better tonight.
Take care,
proper wiring is much more important than gauge, once when gauge is enough
now, 4+12 boards - how's that?
I reckon - sketch I posted above - #437, that's how one channel PSU is looking?
if yes, you need 2 boards per channel, 8 overall
now, 4+12 boards - how's that?
I reckon - sketch I posted above - #437, that's how one channel PSU is looking?
if yes, you need 2 boards per channel, 8 overall
ahem - codyt lucky bstrd, got newest toy amp on Raffle
Right?! I had no idea – peppenino pm'd me. Exciting stuff! I'm sure there was a collective eye-roll when my name was drawn – "that LUCKY BASTARD!!"
Rick, The 77B amp is certainly special. That said, I bet the other Tokin versions are very close.