Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thread

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

God Particle is good stuff.

 

[stuwee]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

God Particle is good stuff.

God Particle sucks eggs!!

Seriously cool Jerry & Lee, any groovy bands out in Powhatan? You could be a concert promoter

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Ok Jer, decision time. Do I wait and send you the 700 Ser I now?? Or wait a week and send it with the new White Oak board in it. Joe is sending me a board or two Friday or Saturday. In the meantime I'll order some DC protect PCB's for said 700. This could be your permanent 700 if you want ORRRRRR I'll stick to the original deal about the custom one. So the decision right now is send it as is or wait 10-14 days more for a much better tricked out version???

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

I was kinda hesitant sending with no Dc protection anyway.

 

[jbeckva]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Sounds like a no brainer.

Definitely would want to wait for one with the protect circuit. Dem Polks are tough to find the "good" drivers for, should anything happen. Thanks man, not a problem!

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Ok, we'll go with the new boards and the Protect PCB's , it just may get the treatment on the special bypasses on C4, C6 but I rthink Joe put those on the new boards, Jer, you're getting the first one available!!!

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Got started. After talking with Joe, the new board should drive the SERIES I just fine. The mounting of the PL14-020 replacement board is different than the factory Pl0171 board so new standoffs will go in to facilitate that. As you can see it already has the 22,000 100volt caps.
It also has On-Semi MJ 15024's AS DRIVERS and On-Semi-MJ 21196's as outputs, that's as good as it gets. Thwere are 180.00 just in new outputs and drivers.

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

There will also have to be 2 temp compensating 2N3403's added to the heatsink, but that also is no problem as I have plenty of those on hand. Jer this looks like a definate GOOOOO!!!!

 

[jbeckva]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Already droolin'!

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

It's kinda funny, the Series I's were better in the mechanical department than the B's, look at how the caps were mounted, very captive.

Q6, which is the temp compensating trans in all 400 and 700B's are mounted on the heatsink, in the 700 Series I they are mounted on the circuit board. How they sensed heat buildup on the heatsinks is beyond me. Thermal tracking of the outputs is usually pretty high on the priority list. Thermal runaway is not something you hear a lot about but it is a real phenomenon and has to be dealt with.
Joe had not considered the Series I when designing his universal replacement board, but as we talked about it last night, it became apparent that modifying the Ser I's to accept the new board was going to be way easier than originally thought. Two standoff's in the middle of the heatsink and 2 2N3403's on the heatsink and it becomes a 700B, maybe not as pretty, but definately the same sound and fury as a B.
When Joe redesigned the driver boards most of the PL bad traits were addressed, in the enhanced version coming sometime next year it will be a whole new world.
Electrolytic caps are understood a lot better than they were in 1972 and the dreaded oscillations should be a thing of the past, there was a lot of time spent on that aspect of the new board as well as power delivery, routing of low level signals, improved sonics by that and elimination of ceramic caps all together. With the new boards the PL's will be quieter with a cleaner sound. Not a bad result from a 40 year old Icon of Audio.

 

[Elite-ist]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Another great article, Lee! It's helpful to see you've archived it as per your usual method. Thanks for the great effort!

Nando.

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

And Nando, pray tell , what are my "usual methods" ?? LMAO!!!

 

[Elite-ist]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

And Nando, pray tell , what are my "usual methods" ?? LMAO!!!

You document with pictures and commentary in the various stages of the build and in the end you sometimes blow it up!

Nando.

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Touche', absolutely correct, for all to see. As we all know sometimes the best lessons learned are mistakes!!

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Oh man, this is beautiful.....

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Yeah, should try ones patience before its over.

 

[mlucitt]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

I need one of those boards...

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Me too Mark. is Joe sending yours tomorrow???

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

Joe's progress on the prototype.

 

[laatsch55]

Re: Jerry's " ONLY ONE IN THE COUNTRY" Phase Linear 700 Thre

More progress.