Sutton's Phase Linear, White Oak 500

[Skratch]

I have RCA-410's that I am going to use for drivers, XPL909 for the outputs all have the same date codes. On one of my other 400's I have the SJ2741 drivers and XPL910 which makes more power 48 volts before clipping at 1000hz. fully loaded. It also has a rail voltage of 85 VDC.

 

[laatsch55]

I have a full set of XPL-910's minus 1 in case you need some. 85 volts is a basdddddddddd 400. They would call that a "hot" transforemer.

 

[Skratch]

Picked up a 5 kva isolation transformer at an auction this morning for 20 bucks. Fed it with 240 volts and the secondary is 60-0-60 center tapped. going to play around with balanced power. Also bought a 2 kva power purification unit made by Controlled Power Company Series 800. Opened it up and looked inside, plugs into 120 volts, has 2 transformers the 1st one brings the voltage up to 750 volts and then the second tranny brings it back down to 117 volts has a bunch of large 1000 volt capacitors. I put it on my variac and adjusted it between 115 and 120 and the output stayed at 117. some new toys to play with.

 

[Gepetto]

You will like the isolation transformer. My setup runs on a Topaz 5KVA ultra-isolation transformer set up balanced as you are doing. Very good item.

 

[laatsch55]

In what we do Joe, where would you use an isolation tranny??

 

[Skratch]

Google 120 volt equi-potential AC system

 

[laatsch55]

Joe, have you checked this out??http://www.equitech.com/articles/rep1.html

Thanks Mark. Great article, much food for thought.

 

[mlucitt]

Joe, Will your cap upgrade fit here when the caps are held in place by conventional cap brackets? The diameter of the caps is very close to 1 3/4" or 45 mm. The cap bodies are about 4" tall. I think there is room there for a double stack, but of course I don't need the retaining plate; there is no screw or aluminum casting to retain the screw.

Thanks,
Mark

 

[Gepetto]

Hi guys
Note that Phase Linear amps have none of the input filters mentioned in that article, that filter configuration is used often in audio gear with SMPS instead of the capacitor input power supplies used in Phase gear. To that extent much of what is written is N/A.

Mark what is your application that you refer to in the previous post? If you "splint" the upper and lower cap together in this application, there should be no real reason that you cannot do something like you propose. Do you have a pic of what you are trying to attempt?


Joe

 

[mlucitt]

Joe, sorry I meant to attach the photo along with the post asking about cap retaining. My main concern is the diameter of the cap that you use in the upgrade, if they are close to 1 3/4" or 45mm, then it should work. Here it is:

[attachment=0:dgcj4au3]PL 400 Caps.jpg[/attachment:dgcj4au3]

 

[mlucitt]

Joe, same post different topic. This PL400 (Serial #143-197) uses the PL 400C board. Have you tried to emulate that board for use with the PLWOA Main Board? The connections to the Q3 off-board bias transistors are in a different location and the connection sequence is brown, black, red; I will check the polarity. The board topology is completely different but I will send you a connection chart (added to yours for convenience). If you could confirm the connections and let me know if your board is approved for a PL 400C replacement, I'll try it.

By the way, it appears to me that the vendor of the violet or purple wires used at Phase Linear created a color that faded with heat over time and now those wires look tan or light brown, that solves the mystery for me.

Thanks,
Mark

 

[laatsch55]

Yep, it replaces the PL 400C. If it can replace the PL0171, the 400C is a piece of cake.

 

[laatsch55]

How about the chassis warp??

 

[Gepetto]

Hi Mark
The commonly available snap ins are either 35mm or 40mm diameter (45mm is available but only for very high voltage application). If you wrap the lower can with foam tape and splint the upper cap to the lower cap, there is no reason I can think of that you cannot use the cap upgrade board in this application. It will be a first however.

 

[laatsch55]

And for what its worth , since the 3rd conversion, I have run separate grounds and power wires to each side bof the board. I think its a neater set up than wires running across the back of the board.

 

[mlucitt]

Lee, I was wondering about that myself. I wanted to run separate wires back to the cap common, just have not done it yet. I was going to pull the capacitors out and bend the chassis over a log to take the sway out of its back. Then I will have to figure out a way to align the front where the faceplate mounts. Any secrets there?

Also, here is a form for you to help keep track of all the PL amps you bring home. Feel free to modify it for your SPEC units.

Joe, I will order one of your cap kits, can you send it with the 40mm capacitors? I assume that would be the 16,800uF pair. Or, if yours are all 35mm, I'll find some of the 40mm snap-in caps from Mouser and I'll just order your Experimenter's Kit.

Thanks,

[attachment=0:1tfags8z]Phase Linear Amplifier Intake Form.docx[/attachment:1tfags8z]

 

[Gepetto]

Hi Mark
I only stock the 35mm diameters presently but there are Panasonic 40D x 50L at Mouser in the 8200uF 100V combination that would allow you to stack and get 16.4KuF in the same space as your original caps.

I would recommend you order the experimenter's kit if you are ready to place a Mouser order else you can wait for me to order with my next order and ship the completed assembly. Your call.

 

[Gepetto]

PS, you should also be able to fit 1-40D x 63L piggybacked with 1-40D x 50L for a total combination of 18.2KuF at 100V

I stock the 35D because the 40D are a real paint scraping fit inside the PL400. You can make them go but it takes a great deal of care to make it so.

 

[laatsch55]

Couple C clamps and a hammer.

 

[mlucitt]

Joe,
The 40mm caps should fit easily because there is no aluminum casting in the way, I can see through to the transformer windings!

I just made my Mouser order and I didn't order any caps (except for the main board) so please add (4) of the 40mm x 50mm 8200uF 100V to your order and send it to me when you get a chance. Let me know the cost and if it is still the same as the 16.8k uF setup, I will place an order on your website.

Mark