| Author |
Message |
barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
|
| Posted: Mon Oct 15, 2012 6:06 am Post subject: |
|
|
| dvh99 wrote: | | shouldn`t the 2k resistor be optimized for this purpose? |
Hi,
This isn't necessary in this case as the current draw from the TDA8444 is extremely low (less than 1mA). So any resistor at the cathode will do as long as it isn't larger than 4K7 or so...
Regards,
barclay66
|
|
| Back to top |
|
 |
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Sat Oct 20, 2012 4:28 pm Post subject: |
|
|
Has there been any talk on what is needed to filter the G2 voltage at all? I can not recall seeing anything in the tread off hand.
Secondly, What effect would filtering the P14 voltage have on picture quality if any? I know the line is noisy as Jarmo showed but I do not want to invest the time in cleaning it up if there is no visible difference.
Also, I am wondering if there would be any benefit to going with Naked Vishay z-foil (I love these resistors in my audio projects but they are not cheap),Caddock or PRP resistors in critical points of the video chain instead of the ones that are there now. I know Nash was thinking of doing some in the VIM. Anybody done this at all?
As always just thinking out loud......
James
Last edited by CxTurbo on Sat Oct 20, 2012 8:54 pm; edited 1 time in total
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Sat Oct 20, 2012 7:17 pm Post subject: |
|
|
| CxTurbo wrote: | Has there been any talk on what is needed to filter the G2 voltage at all? I can not recall seeing anything in the tread off hand.
There might be some things you can do.
On the VNB add a high voltage ceramic or film cap from the G2 to ground. I think this is what A few guys have done. But with out scoping the G2 i can not say what value cap to use. id say it be in the picofarad range. I think there is one there already so i bet it either be up or down in value from that caps value.
I think Mike Also used inductors here in some fashion.
The best thing was the Tants you added in the HVPS. However I think the new Clarity Film caps in a 33uf value might do better, and at 25 bucks each much cheaper than Wet tants.
Secondly, What effect would filtering the P14 voltage have on picture quality if any? I know the line is noisy as Jarmo showed but I do not want to invest the time in cleaning it up if there is no visible difference.
Any noise reduction at the VNB or in the tube I think would help.
Also, I am wondering if there would be any benifit to going with Naked Vishay z-foil (I love these resistors in my audio projects but they are not cheap),Caddock or PRP resistors in critical points of the video chain instead of the ones that are there now. I knbow Nash was thinking of doing some in the VIM. Anybody done this at all?
I bought some Dale HIgh quality low PPM resistors I never tried yet. I really want to try the Tantalum resistors I bought for the VNB's 85 volt line, those 33ohm resistors.
As always just thinking out load......
James |
One thing Chris also did was add two more Aqua Dags from the tubes bell housing to the extra ground points on the VNB.
Id think maybe add some grounding from the focus coils as well, I always get zapped when touching the plastic housing
of the focus coil. i just seams to build up faster than it drains.
Nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
htguy1
Joined: 30 Jul 2008
Posts: 99
|
| Posted: Sat Oct 20, 2012 8:50 pm Post subject: |
|
|
| Nashou66 wrote: | | WTS wrote: | | Do you have a schematic of this filter? What does the Marquee use for regulation on the filaments? |
There is the typical voltage regulator power supply and then a trim pot and a few resistors to adjust it to the 6.37 VDC needed, on shut down it stays at 3.xx VDC.
The relay section can be removed if you dont want it, jarmo added this to shut off the filament voltage if it goes over a certain value. |
Cool idea guys. I did mine a bit easier way...
http://s1272.photobucket.com/albums/y393/m_mcgranahan/?action=view¤t=2012-10-20154501_zpscb0a5472.jpg
Some wide band chokes on the neck cards and smd resisters to ground on the back side of the neck cards.
Made a big difference for me.
Thanks
God bless...
Mark
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Sat Oct 20, 2012 9:12 pm Post subject: |
|
|
| Nashou66 wrote: | | CxTurbo wrote: | Has there been any talk on what is needed to filter the G2 voltage at all? I can not recall seeing anything in the tread off hand.
There might be some things you can do.
On the VNB add a high voltage ceramic or film cap from the G2 to ground. I think this is what A few guys have done. But with out scoping the G2 i can not say what value cap to use. id say it be in the picofarad range. I think there is one there already so i bet it either be up or down in value from that caps value.
I think Mike Also used inductors here in some fashion.
The best thing was the Tants you added in the HVPS. However I think the new Clarity Film caps in a 33uf value might do better, and at 25 bucks each much cheaper than Wet tants.
Secondly, What effect would filtering the P14 voltage have on picture quality if any? I know the line is noisy as Jarmo showed but I do not want to invest the time in cleaning it up if there is no visible difference.
Any noise reduction at the VNB or in the tube I think would help.
Also, I am wondering if there would be any benefit to going with Naked Vishay z-foil (I love these resistors in my audio projects but they are not cheap),Caddock or PRP resistors in critical points of the video chain instead of the ones that are there now. I know Nash was thinking of doing some in the VIM. Anybody done this at all?
I bought some Dale HIgh quality low PPM resistors I never tried yet. I really want to try the Tantalum resistors I bought for the VNB's 85 volt line, those 33ohm resistors.
As always just thinking out loud......
James |
One thing Chris also did was add two more Aqua Dags from the tubes bell housing to the extra ground points on the VNB.
Id think maybe add some grounding from the focus coils as well, I always get zapped when touching the plastic housing
of the focus coil. i just seams to build up faster than it drains.
Nashou |
Thanks for the reply Nash,
Partsconnexion is not far from me (45 mins or so) and are a good group of people. Some history for you guys, they started Sonic Frontiers know know as Anthem. Paradigm bought the company and now runs the show. Regardless I will order up some Clarity Caps from them for the HVPS. I'll also look into the resistor thing when I place the order.
I will work on the P14 filter etc to try and de-noise that line as well. I have some Aqua Dags on some burnt 8" tubes so when I re tube my 9" housings I will add them and additional grounding.
There was a thread a one time that seems to have gone now on additional grounding on the back plane boards if I remember correctly. Think MP started it. Does anyone have the info. The links I found to it are dead now for me :\
James
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Sat Oct 20, 2012 9:16 pm Post subject: |
|
|
| htguy1 wrote: | | Nashou66 wrote: | | WTS wrote: | | Do you have a schematic of this filter? What does the Marquee use for regulation on the filaments? |
There is the typical voltage regulator power supply and then a trim pot and a few resistors to adjust it to the 6.37 VDC needed, on shut down it stays at 3.xx VDC.
The relay section can be removed if you dont want it, jarmo added this to shut off the filament voltage if it goes over a certain value. |
Cool idea guys. I did mine a bit easier way...
http://s1272.photobucket.com/albums/y393/m_mcgranahan/?action=view¤t=2012-10-20154501_zpscb0a5472.jpg
Some wide band chokes on the neck cards and smd resisters to ground on the back side of the neck cards.
Made a big difference for me.
Thanks
God bless...
Mark |
Mark,
What type of 75R cable are you running on your mini RCA line there?
I have been toying with the Idea of upping that as well and just re-using the stock mini RCA's I was thinking of some nice Belden or Canare shielded 75R cable.
James
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
htguy1
Joined: 30 Jul 2008
Posts: 99
|
| Posted: Sat Oct 20, 2012 9:57 pm Post subject: |
|
|
| CxTurbo wrote: | | htguy1 wrote: | | Nashou66 wrote: | | WTS wrote: | | Do you have a schematic of this filter? What does the Marquee use for regulation on the filaments? |
There is the typical voltage regulator power supply and then a trim pot and a few resistors to adjust it to the 6.37 VDC needed, on shut down it stays at 3.xx VDC.
The relay section can be removed if you dont want it, jarmo added this to shut off the filament voltage if it goes over a certain value. |
Cool idea guys. I did mine a bit easier way...
http://s1272.photobucket.com/albums/y393/m_mcgranahan/?action=view¤t=2012-10-20154501_zpscb0a5472.jpg
Some wide band chokes on the neck cards and smd resisters to ground on the back side of the neck cards.
Made a big difference for me.
Thanks
God bless...
Mark |
Mark,
What type of 75R cable are you running on your mini RCA line there?
I have been toying with the Idea of upping that as well and just re-using the stock mini RCA's I was thinking of some nice Belden or Canare shielded 75R cable.
James |
Wire world silver clad wire
|
|
| Back to top |
|
|
htguy1
Joined: 30 Jul 2008
Posts: 99
|
| Posted: Sat Oct 20, 2012 10:03 pm Post subject: |
|
|
Thanks for the reminder, I guess I have been a bit lazy on those. Speaking of lazy, do you remember the values I need for them?
Thanks
God bless...
Mark
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Sat Oct 20, 2012 10:35 pm Post subject: |
|
|
Shinkoh and Audio Note have nice Tantalum resistors. Shinko are only available in 2W now at Partsconnexion as they are NOS at this point. Audio Notes are available in 1W and 2W.
I will be using the Amtrans AMRG 2W resistors in the 10K and 100K positions. I loved the Riken Carbons in my chip amp kit and they are not too badly priced.
http://www.partsconnexion.com/prod_pdf/amrg.pdf
http://www.partsconnexion.com/resistors_amtrans_amrg_two_watt.html
Might even do my other HVPS with them and the Clarity Caps just to check out.
James
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Sun Oct 21, 2012 6:44 pm Post subject: |
|
|
So you would not use the AMRG's in the HVPS or in the VNB's Nash?
Looking at the REX75's they have a working voltage of 500V and Overvolt of 1000V so I thought they would be safe.
Wish I could find the voltage info on the Shinkoh's as they are non magnetic. The AN ones have magnetic end caps to increase the working voltage. Regardless I will keep looking for info on the Shinkoh resistors or ask the guys at Partsconnexion.
_________________
Paradigm Studio 100's,Studio 20's,CC-690, Paradigm DSP-3400 V1 SUB
Pioneer Elite SC-35 AVR
Pioneer Elite BDP-05FD Bluray
3x Bryston 3B's
URC Complete Control Medius TX-1000 Remote
HTPC (LGA775 Q6600, 8GB DDR2, 7TB Storage) Mediaportal
Lumagen MINI 3D
Moome FULLHD-EXT V2
Audioquest Cable Top to Bottom
9501LC
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Sun Oct 21, 2012 7:07 pm Post subject: |
|
|
| CxTurbo wrote: | So you would not use the AMRG's in the HVPS or in the VNB's Nash?
Looking at the REX75's they have a working voltage of 500V and Overvolt of 1000V so I thought they would be safe.
Wish I could find the voltage info on the Shinkoh's as they are non magnetic. The AN ones have magnetic end caps to increase the working voltage. Regardless I will keep looking for info on the Shinkoh resistors or ask the guys at Partsconnexion. |
Im not sure. it depends on the G2 max voltage, which would be a full field white that we hardly ever leave on for long.
But I really think they;ll be ok since the Ohmite's that are in there are the same working voltage and they are fine. But they are ceramic and might be under rated.
Nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Tue Jan 22, 2013 4:43 pm Post subject: |
|
|
I've been trying to find the inductors in either 220uH or 270uH 3A but all I come up with are the toroid type. Is that what you were using Barclay or are yours like the Bobbin wound ones like Nash used? Either way I can not for the life of me find bobbin ones rated at over an amp or so.........
I am trying to compile a list by board of components to share with everyone as the thread has hidden bits here and there IF you had not read it from front to back.
Any help would be great here.
James
_________________
Paradigm Studio 100's,Studio 20's,CC-690, Paradigm DSP-3400 V1 SUB
Pioneer Elite SC-35 AVR
Pioneer Elite BDP-05FD Bluray
3x Bryston 3B's
URC Complete Control Medius TX-1000 Remote
HTPC (LGA775 Q6600, 8GB DDR2, 7TB Storage) Mediaportal
Lumagen MINI 3D
Moome FULLHD-EXT V2
Audioquest Cable Top to Bottom
9501LC
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Tue Jan 22, 2013 4:53 pm Post subject: |
|
|
Where do you want to use these James? On the Focus board I used much small amp rating and had no issues till I added some color wheel( look like resistors) Inductors. That screwed up mY FCM and I never got it working right yet.
So maybe leave those out.
I am not sure how much current draw there is on the VDM if your planing on doing what MP did there.
But those smaller ones I used on the CLM were what I first used on the FCM and worked fine till someone posted they were too low in amp value and I changed them to those HUGE inductors. Those should be glued in place. But for now do the other changes and that can always be done later if you really feel the need.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Tue Jan 22, 2013 5:23 pm Post subject: |
|
|
Got it Nash.
I was planing on using these on the FCM as you did and on the VDM as Barclay described he did a page back. Barclay indicated that he got his from scrapped power supplies and used thick wire inductors. I suppose I could always measure the amperage on those lines to be safe.
While we are on topic of the VDM, CVM and Stigmator Amplifier. Was it not MP that advised on adding a ground wire to those boards? I found a thread that mentioned this mod but the link appears to have been dead. I vaguely remember seeing a picture of a wire being soldered to the ground point on the one connector. Does anyone have more information on this? Is it required or worth the trouble?
I know your are a busy man Nash. Thanks for the help you have provided me on this little project of mine.
James
_________________
Paradigm Studio 100's,Studio 20's,CC-690, Paradigm DSP-3400 V1 SUB
Pioneer Elite SC-35 AVR
Pioneer Elite BDP-05FD Bluray
3x Bryston 3B's
URC Complete Control Medius TX-1000 Remote
HTPC (LGA775 Q6600, 8GB DDR2, 7TB Storage) Mediaportal
Lumagen MINI 3D
Moome FULLHD-EXT V2
Audioquest Cable Top to Bottom
9501LC
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
|
| Posted: Tue Jan 22, 2013 10:23 pm Post subject: |
|
|
Awesome. Thanks for that. I will add that to the spreadsheet.
At the moment I am going through the remaining boards then I will add it to the sheet as well.
I will be ordering the Caps and Resistors in the next day or so to get that started.
Has anyone removed the heatsink on the VNB without damage? Or is it still not advised? I would like to have that extra room to work and it would also help make things much cleaner.
James
_________________
Paradigm Studio 100's,Studio 20's,CC-690, Paradigm DSP-3400 V1 SUB
Pioneer Elite SC-35 AVR
Pioneer Elite BDP-05FD Bluray
3x Bryston 3B's
URC Complete Control Medius TX-1000 Remote
HTPC (LGA775 Q6600, 8GB DDR2, 7TB Storage) Mediaportal
Lumagen MINI 3D
Moome FULLHD-EXT V2
Audioquest Cable Top to Bottom
9501LC
|
|
| Back to top |
|
|
|
|
