Hi John, no apologies needed, I shouldn't assume you can read my mind.
"On the line in side - common is negative
- the leg at 0.018uf - positive"
That is correct.
"Input R of amp- top + and bottom - (does this go into the input of the amp? on just the right channel?"
Should read "Input resistance of amp" And yes, the top is +, the lower, common, ground, or -.
A filter is required for each channel.
HTH
Geoff
"On the line in side - common is negative
- the leg at 0.018uf - positive"
That is correct.
"Input R of amp- top + and bottom - (does this go into the input of the amp? on just the right channel?"
Should read "Input resistance of amp" And yes, the top is +, the lower, common, ground, or -.
A filter is required for each channel.
HTH
Geoff
No, not from this circuit at least,.now my 27 pre is a differant story..it is my first scratch DIY build & almost got it quiet, . My layout was not the best on tube placement, as is no body told me you can't put a rectifier inbetween Vr-75 glow tubes & the 27's..lol .........I am building a 26 now..so hum will be apart of my life for awhile while I learn to conquer it. I didn't even have percievable niose issue from the correction circuit even when rat nested, at least I couldn't hear it. Just looked scarier than sh....But I do really feel better now, about not shorting my amp out & such...Sure appreciate you takeing the time to put this circuit together for everybody. If I were someone thinking of putting this curciut together, I would just use cheap Stryrenes & Rat Shack film resisors & be done.
Good mistakes are the ones we learn from. Bad ones cost you $ and happen that quick you can't tell what happened first.
I have seen commercially built tube amps with hum balancing circuits to fix a layout problem. Not the right way to go about it.
Good luck with the 26s.
I have seen commercially built tube amps with hum balancing circuits to fix a layout problem. Not the right way to go about it.
Good luck with the 26s.
Anyone compared geoff's circuit to the MOX at audiocircle yet? I've run my b200's solo moxed at 0.68mH and 6.8ohms, and its still to sharp for me, so about to go with 1mH and 8 or 10ohms. this circuit is totally different! I am a slow to enact but excited by the final result yet to come
Yes, I have compared the MOX circuit to this. I prefer this circuit for many reasons, I also HP @150 & run the circuit as stated my last couple posts, still unchanged. What amp , pre & speaker style...do you have running.?I have not been eyeballing differant drivers since I did a final install of this circuit, just building tube gear now & haveing fun......
Hi HM, no I didn't think of a horn. Brings up the bass though, but adds delay. Did you use a RS level meter? Good top end if you did.
I don't think Joe would adopt a horn. He's OB.
Regards,
Geoff
I don't think Joe would adopt a horn. He's OB.
Regards,
Geoff
Hi HM, I was thinking more of stored energy in the baffle / cabinet. We agree on one thing, less is more. I couldn't see any waterfall plots on your site.
On an OB, the delayed rear wave attenuates much more than that from a BLH.
The attached is the result of an OB under development. The SPL meter has a 18 dB/oct slope above 10K.
On an OB, the delayed rear wave attenuates much more than that from a BLH.
The attached is the result of an OB under development. The SPL meter has a 18 dB/oct slope above 10K.
Attachments
Geoff H
Hello,
"On an OB, the delayed rear wave attenuates much more than that from a BLH."
sorry this is wrong!!
change the time of your csd, this doesn´t help.
Your fre. response is what: 1 W 1m 0° ?? XO ? B200??
Do you can change something of waterfall by a FR? No!!
so look the producer data.
Until 1994 i didn´t measure, I let measure by the
driver producer or the DIY journals where i publish,
and my joiner take measurements, sorry I listen only ;-)
Hello,
"On an OB, the delayed rear wave attenuates much more than that from a BLH."
sorry this is wrong!!
change the time of your csd, this doesn´t help.
Your fre. response is what: 1 W 1m 0° ?? XO ? B200??
Do you can change something of waterfall by a FR? No!!
so look the producer data.
Until 1994 i didn´t measure, I let measure by the
driver producer or the DIY journals where i publish,
and my joiner take measurements, sorry I listen only ;-)
Hi Dave, you mean like this. Arta comes with good documentation, if you read it. Note to self, RTFM.
HM, if the rear wave is not enhanced by the BLH, I dont see the point in it, yet the design has a strong following. Some of us like the sound of a full ranger on an OB.
The waterfall will be changed by cabinet materials and type. That is audible. And yes, I do understand about the first wave. So much so my other full rangers are undergoing surgery. That's another story.
The FR is at 1 metre, about one watt. No xo. No, it's not a B200, and there is no producer data - I'm working on it. Yet to fix the dip at 1K now that I have extended the top to 18K. Then attack the stored energy.
I too use my ears more than meters. In Joe's case, I used his ears and interpretation, and Visaton's published data to arrive at something he's happy with.
Regards,
Geoff.
HM, if the rear wave is not enhanced by the BLH, I dont see the point in it, yet the design has a strong following. Some of us like the sound of a full ranger on an OB.
The waterfall will be changed by cabinet materials and type. That is audible. And yes, I do understand about the first wave. So much so my other full rangers are undergoing surgery. That's another story.
The FR is at 1 metre, about one watt. No xo. No, it's not a B200, and there is no producer data - I'm working on it. Yet to fix the dip at 1K now that I have extended the top to 18K. Then attack the stored energy.
I too use my ears more than meters. In Joe's case, I used his ears and interpretation, and Visaton's published data to arrive at something he's happy with.
Regards,
Geoff.
Attachments
Geoff H
Hello,
this threat is about the B200, what helps another driver
fre. response??
Show us the B200 OB fre. response, nothing else,
compair it with my solution, specially the SPL.
no dought about listening to OB´s, that not the point.
Yes of cause a bad box is listenable.
Your CSD shows more than 40 ms at 2 kHz,
that is worse as can be.
I didn´t say that my solution is the only way,
it is only a puristic solution, without XO and a never realised
soundstage with ~96 dB 1 W with one of the best sat
8" FR the B200.
Hello,
this threat is about the B200, what helps another driver
fre. response??
Show us the B200 OB fre. response, nothing else,
compair it with my solution, specially the SPL.
no dought about listening to OB´s, that not the point.
Yes of cause a bad box is listenable.
Your CSD shows more than 40 ms at 2 kHz,
that is worse as can be.
I didn´t say that my solution is the only way,
it is only a puristic solution, without XO and a never realised
soundstage with ~96 dB 1 W with one of the best sat
8" FR the B200.
HM you are correct. This thread is about the 200B. My CSD and FR was to prove the point there is a lot more than just FR.
So have you a CSD for the SAT Horn? (which I think is a nice solution) so it can be compared to one on an OB with 200B.
Regards,
Geoff.
So have you a CSD for the SAT Horn? (which I think is a nice solution) so it can be compared to one on an OB with 200B.
Regards,
Geoff.
sorry no,
may be Visaton,
or my joiner.
the key of this solution is first:
the horn works only up to~600 hz with a warm roll of !!
2.
koaxial horn throat and mouth.
3.
extrem small wall distance the last 45 cm of the horn.
if you listen in 4-8 m distance and take enough sub´s,
its one of my best, in normal distances 2,5-4m the smaller one´s
better, specially WAF ;-)
regards Horst
may be Visaton,
or my joiner.
the key of this solution is first:
the horn works only up to~600 hz with a warm roll of !!
2.
koaxial horn throat and mouth.
3.
extrem small wall distance the last 45 cm of the horn.
if you listen in 4-8 m distance and take enough sub´s,
its one of my best, in normal distances 2,5-4m the smaller one´s
better, specially WAF ;-)
regards Horst
This is from the Visaton site. I can only assume the driver was mounted on a standard baffle.
www.visaton.com/bilder/ausschwing/gross/b200_zd.gif
Joe's system retains the 96dB/w, as the filter is placed in front of the amp.
The CSD I posted was measured when placing the baffle on a upturned plastic tub. The time at 2K is about 20ms when on the floor.
Perhaps some one else has a CSD of the B200 in a cab.
Regards,
Geoff.
www.visaton.com/bilder/ausschwing/gross/b200_zd.gif
Joe's system retains the 96dB/w, as the filter is placed in front of the amp.
The CSD I posted was measured when placing the baffle on a upturned plastic tub. The time at 2K is about 20ms when on the floor.
Perhaps some one else has a CSD of the B200 in a cab.
Regards,
Geoff.
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