Sutton's Phased Linear White Oaked 1000 Rigg

[mlucitt]

Unfortunately, my fans are 120VAC and the optimum way to control the speed of the fan induction motors is with a variable frequency control (big and expensive). I could have used 12VDC motors and then construct a circuit as Joe described with an auxiliary 12V transformer to power the fans and the logic circuits. I'll try that on my next build.

I think by running the two fans in series whenever the amp is turned on I can accomplish my goals of 1) quiet fan operation by reducing the fan speed by about half, 2) keeping the outputs consistently cooler by reducing the heatshink temperature, and 3) keeping the wiring simple and the amplifier close to original (without any drilled holes or added chassis components that cannot be backed-out).

Thoughts?

Mark

 

[jbeckva]

How much is coming out of that secondary feeding the lights? Any possibility of putting a bridge in there and seeing how much DC will be produced?

 

[mlucitt]

6 VAC from the secondary of T1. The White Oak Audio Light Board I have in my amp already has a bridge. Probably not enough DC there to run the fans but I could use the power for the logic and timing of a speed circuit.

Mark

 

[speakerman1]

Mark
Do you have a back on your case if not. Put a thin piece of wood on only by the fins and put a fan there. Then you could do 120 volt w/o going in the amp. Since you guys have brought this up. I have thought of building a case out of one of the exotic woods. Zebra wood is very nice if done right. So is Rosewood. Or black walnut with a light trim..

Larry

 

[laatsch55]

I have a cabinet that came from the Cali 700's, I'll send it along too Sutton.

 

[laatsch55]

I'm crankin the Spec's-------- BUT JESUS!!!!!! IT IS NOT THE SAME!!!!!!!!!!!!!!!!!!! Current limiterts kick just when it starts to get interesting!!!!!!

I must build another 1000, i must build another 1000

 

[laatsch55]

Ok, back to work. Remember when you were a kid, and you would take all your marbles and put all of them on the same piece of floor and just "covet" them?? Or legos, or trading cards, or R/C Model sailplanes. OR NOW TO_3"S!!!!!! Seems decadent to have that many in your possession!!!!

needed a bunch of Polypro .1 MFD for the Zoebel networks, original were 100 volt , these 250 volt

 

[laatsch55]

How bout drivin the 21194's with the 21196's??????? can't say as I've done that one before.

 

[laatsch55]

Did get some stuff done. Caps, rerouting the AC in, and the fuseholder to the area by the transformer.

 

[ksrigg]

Wow Lee,

So you are back home now, obviously and making some progress with the 700 Rigg. Looks great to me. I have some .1uF russian PIO's if they are needed for the amp. They are 250V. I also have some other values if ya need them, but I don't know that a vintage PIO would make any difference except maybe in a critical place. The other PIO are 650V as I recall, not sure of the value, I'll have to look. But if you needed any, you'd already have em. I know. Let me know if there is anything I can do to help..

 

[mlucitt]

Larry, I was thinking of a cabinet back, but I like to look back there and admire the raw power coming from those outputs. That's why I leave those black strips of metal off of the heatsinks. I think Phase Linear once made a duct for the back of these amps. I bet Lee has some in his pile of parts.

Oh, and scrap the idea of running the fans in series. I just hooked one up and they run fairly slow and very quiet. I will be wiring them in parallel. Lee those Apex fans are the best.

Mark

 

[ksrigg]

Could you just mount a fan or fans on a wood blcok and if there was reason to remove the amp from the cabinet, just take the fan out, without having to deal with unmounting or anything? It could even be mounted to a very thin piece of plywood with the fan having it's own power (plug) which would tap into the aux power on the amp's back, leaving the amp"stock" while providing protection when needed?

Just thinking....

 

[laatsch55]

Larry, I was thinking of a cabinet back, but I like to look back there and admire the raw power coming from those outputs. That's why I leave those black strips of metal off of the heatsinks. I think Phase Linear once made a duct for the back of these amps. I bet Lee has some in his pile of parts.

Oh, and scrap the idea of running the fans in series. I just hooked one up and they run fairly slow and very quiet. I will be wiring them in parallel. Lee those Apex fans are the best.

Mark

I don't have any ducts but a bushel basket full of those transistor covers. I'll get a couple of the Apex fans headed this way.

 

[laatsch55]

I'll figure something out Sutton.

 

[laatsch55]

Wow Lee,

So you are back home now, obviously and making some progress with the 700 Rigg. Looks great to me. I have some .1uF russian PIO's if they are needed for the amp. They are 250V. I also have some other values if ya need them, but I don't know that a vintage PIO would make any difference except maybe in a critical place. The other PIO are 650V as I recall, not sure of the value, I'll have to look. But if you needed any, you'd already have em. I know. Let me know if there is anything I can do to help..

A PIO, or " Paper-in-oil" cap would not hold up well on the speaker outputs, pretty unforgiving place there.

 

[laatsch55]

The Laatsch House is going to be entertainming a lot of family at the end of September. Jani's Mother and Father passed away in November of last year, 7 days apart. They had been divorced for 30 years, but passed 7 days apart. Anyway, the pics posted required some background. My bench has not had this much room on it since I started this fixin thing. Janio has been going through her parents stuff in order to make enough room to properly distribute family when they finally get here. Why are they coming you ask?? Newt wanted his ashes spread in a very gorgeous part of the Big Horn Mountains, Doris wanted her ashes spread accross her ranch 58 miles north of town BUT and I quote " NOT WHEN THE WIND IS BLOWING OR I"LL WIND UP ON BOARDMAN"S PLACE AND FOR THAT I WILL HAUNT YOU!! unquote. Doris was an amazing woman and i loved the shit outta her. SO.........what the hell has that got to do with my bench being neat and organized?? Jani was on a roll and as she rolled through the mancave I stuck around long enough to say "STAYS", or "GOES' till she was done asking.+
Crapped my own thread.

The amp, oh the amp. All low level and signal DC is being rerouted together and on the other side of the amp from the AC mains. That requires the AC fuseholder to be mounted on the side of the amp, along with the power cord./ Will post pics when you can tell I've done something.

 

[laatsch55]

Had to hand file the profile for the fuseholder as it has a "flat" and a round hole don't work. Went undersize on the cord grip and hand filed it till it fit right. Now that this is done we arew going to implement Joe's improved grounding scheme, with the added benefit of less chance of inducted "bad things".

 

[laatsch55]

Fuseholder and AC in wired.

 

[mlucitt]

Lee,
I like your AC power relocation mod. That is the way it should have been done. It would be good to have an IEC jack with a internal filter, but I don't see any place to put it. With a three-wire, would you just ground the chassis?

Where on the PL 700B White Oak Audio miracle board did you pick off your speaker relay +/- 20 Volts? I am going to add the P33 speaker protection and muting board that Rod Elliott sells. I know it will eliminate the minor turn-on thump but when does your speaker relay drop out after you turn off the amp? There is so much reserve capacitance, I watch the LEDs dim over a period of 30-45 seconds. Rod brings in AC power to the board and when that is cut the relay drops out.
Mark

Mark

 

[laatsch55]

On the top or R70. And it does NOT release the relay coil till JUST AFTER thump time. After adding the 2 1N4148's there was no need to be concerned about that so I put the power supply back to Joe's board. Before he came up with the fix I had a small 18 volt secondary x-former , small BR and cap as a separate PS like I did on Larry's.