700 Series II Clair Originality

[WOPL Sniffer]

If I understood Ed correctly, they didn't make Clair 400's... Although I could glue a Clair 700 II face on there... WHY??? who knows.

 

[WOPL Sniffer]

hi
Here is Przem's write up in a pdf

View attachment 22823

In Przem write up, page 8 in modifications, he suggest "Installing reservoir electrolytic caps" (4.7uf 35V) in parallel with D1 and D2). Being these are Zener diodes, is the Negative side of the cap going to attach to the anode (non banded end) being that is the ground point??
I know depending on the circuit, it could actually be the other way around.

 

[grapplesaw]

Maybe I'll revisit the backplane replacement. It is a lot of work too though. Total rewire of the whole chassis... Kinda kills the originality of these. IDK......

If you are considering any work to the existing back plain then Please have alook [ at this bulletin re upgrade pl36 series ll to full complementary set up

 

[Northwinds]

^^^^^ Ed mentioned to me that the service bulletins have lots of errors. The pictures you uploaded don't open big enough to see any detail also, they are like 2 inches big LOL

 

[grapplesaw]

If you are considering any work to the existing back plain then Please have alook [ at this bulletin re upgrade pl36 series ll to full complementary set up





I hope this is better

 

[grapplesaw]

^^^^^ Ed mentioned to me that the service bulletins have lots of errors. The pictures you uploaded don't open big enough to see any detail also, they are like 2 inches big LOL

I have reposted it

I am sure that Denis would agree with me that Size does matter!

 

[grapplesaw]

Here is the Pl36 board and backplane

 

[Northwinds]

The first one you fixed is good, this latest bunch all are tiny

 

[grapplesaw]

The first one you fixed is good, this latest bunch all are tiny

I reloaded two of them
I have to find the other original to reload
If any one else has it please add

Here is thread on dyiaudio worth reading.
http://www.diyaudio.com/forums/soli...00b-refurb-full-complementary-conversion.html

 

[grapplesaw]

Here is the Pl36 board and backplane

View attachment 22833 View attachment 22834

You can find the image here in Przem's thread at
http://www.diyaudio.com/forums/solid-state/169883-phase-linear-700-series-ii-restoration.html

 

[WOPL Sniffer]

These are already Full Comp so does that change anything???

 

[WOPL Sniffer]

In Przem write up, page 8 in modifications, he suggest "Installing reservoir electrolytic caps" (4.7uf 35V) in parallel with D1 and D2). Being these are Zener diodes, is the Negative side of the cap going to attach to the anode (non banded end) being that is the ground point??
I know depending on the circuit, it could actually be the other way around.

Did you see this question? Just wondering.

 

[grapplesaw]

Here is the Pl36 board and backplane

View attachment 22833 View attachment 22834

These are already Full Comp so does that change anything???

Yes it does, not much but a few things. If you are going to rebuild the the backplane them you may want to do this. Compare these to the ones in the series two service manual.

See this bulletin re convention

.

Here is the quasi set up

 

[grapplesaw]

Here are some after and before from this site.
I do not agree with some of the changes such as cutting traces on the pl36 board. Read the post #94 I thimk for his summery..

http://www.diyaudio.com/forums/soli...00b-refurb-full-complementary-conversion.html

From that post.


Here is his build

 

[WOPL Sniffer]

Very NICE. Still asking the cap question.

In Przem write up, page 8 in modifications, he suggest "Installing reservoir electrolytic caps" (4.7uf 35V) in parallel with D1 and D2). Being these are Zener diodes, is the Negative side of the cap going to attach to the anode (non banded end) being that is the ground point??
I know depending on the circuit, it could actually be the other way around.

 

[Northwinds]

I see Navo is on, perhaps he could help with your question

 

[grapplesaw]

Very NICE. Still asking the cap question.

In Przem write up, page 8 in modifications, he suggest "Installing reservoir electrolytic caps" (4.7uf 35V) in parallel with D1 and D2). Being these are Zener diodes, is the Negative side of the cap going to attach to the anode (non banded end) being that is the ground point??
I know depending on the circuit, it could actually be the other way around.

I have not seen this done

If we do not get any other input I will email Przem and ask him for more details

Lee should have an opinion as he was part of those threads I posted links to

 

[Gepetto]

Very NICE. Still asking the cap question.

In Przem write up, page 8 in modifications, he suggest "Installing reservoir electrolytic caps" (4.7uf 35V) in parallel with D1 and D2). Being these are Zener diodes, is the Negative side of the cap going to attach to the anode (non banded end) being that is the ground point??
I know depending on the circuit, it could actually be the other way around.

The cap plus should be on the banded (cathode) end of the zener diode. For the positive side regulator, this banded cathode side is the plus voltage. For the negative side regulator, this banded cathode side is attached to ground. Either way, the band is where you put the capacitor anode (positive side)

 

[grapplesaw]

So while we are asking Questions

What is the reason for the change of the Dropper Resistors on Phase Linear Control Boards R1, R2 from 2.7K/5W to 7.5K/5W when changing the op amp lf356 to lf351

Both these op amps are 15 volt units and similar min max voltages?

Is the current draw less with one thus the different resistance?

Please enlighten me.
thanks
glen

 

[Gepetto]

So while we are asking Questions

What is the reason for the change of the Dropper Resistors on Phase Linear Control Boards R1, R2 from 2.7K/5W to 7.5K/5W when changing the op amp lf356 to lf351

Both these op amps are 15 volt units and similar min max voltages?

Is the current draw less with one thus the different resistance?

Please enlighten me.
thanks
glen

Lower supply current requirements for the LF351 than the original LF356 plus they originally overprovisioned the necessary supply current needs of the LF356 which resulted in PC boards that turned brown at the connection points and ruined the etch from the heat dissipated by the original dropping resistor. Common problem on that PL36 board.