Przem's Phase Linear 700 Series II White Oak Conversion

[laatsch55]

Joe....with your board, whar exactly does the direct/normal switch accomplish now??

 

[Gepetto]

Joe....with your board, whar exactly does the direct/normal switch accomplish now??

Same as it always did Lee, block DC from the preamp in normal mode if the preamp happens to have an output DC offset problem.

 

[laatsch55]

Just making sure.....thank you...

 

[P.L.F.]

OK Przem...Nav sent some really nice silver shielded stuff,
O'll leave the socket where it is and we'll see what I can do..

That's fine with me Lee, thank you!

And you know that we all are missing a bit more news on the project & pictures ... Still crazy time for you, ehhh?

 

[laatsch55]

Yes PLF, what time I have had has been taken up with Kev's crosses.

 

[P.L.F.]

Hi Lee, did you replace the rosted woofer(s)?

 

[laatsch55]

Yep, and fixed the crossovers,...

 

[P.L.F.]

Yep, and fixed the crossovers,...

And what went wrong with crosses?

 

[laatsch55]

The 10 ohm 10 watt swamping resistors went bad.

 

[P.L.F.]

The 10 ohm 10 watt swamping resistors went bad.

... Must've been hit pretty bad... Are you that cruel upon testing Lee?

 

[laatsch55]

Not cruel, thorough....

 

[Skynyrd77]

Not cruel, thorough....

 

[laatsch55]

Joe, why do ya suppose there are no 220K resistors on the 700II's inputs??

 

[Gepetto]

Joe, why do ya suppose there are no 220K resistors on the 700II's inputs??

I am guessing some previous owner removed them along the way Lee because the S2 documentation calls for them.

The more humorous side of me however is picturing a group of bean counters in 3 piece suits walking down the hallway into the engineering department and shouting, "The Japanese and Sony are crushing our market. You engineers have to find a way to slash our costs and do it quickly. No more expensive analog meters, no more expensive PL20 control boards, no more inlaid back illuminated front panel AND no more 220K resistors on the input jacks."

 

[laatsch55]

LMOAO!! Joe I love your humorous side, they will be remounted!

 

[P.L.F.]

I am guessing some previous owner removed them along the way Lee because the S2 documentation calls for them.

Not me ...

Would that be the reason to hear a slight hum in any volume pot position, except going for max.?

 

[laatsch55]

No, they provide a pathway for static electricity to discharge through when plugging in the IC's...

 

[gadget73]

Where are these 220k resistors typically found? If its across the direct/indirect switch, I'm reasonably sure my friend's 700-II did not have them either. The Pro doesn't have the switch at all, and no resistors over in that area either.

 

[laatsch55]

The 220's are put between the input copper ground plane and the plus tab of the input RCA's

 

[gadget73]

can't recall if his had them or not. I want to say no, but I wouldn't bet a sandwich on it. The Pro does not though, but it also used 1/4" jacks instead of RCA.