WOPL on a 700 Series II

[Lost in Bass]

Could someone please explain this to me in plain layman's terms? If the WOPL upgrade was applied to a 700 Series II, wouldn't that basically turn the 700 into a 400? What makes the 700's 350 watts per channel more than compared to the 400's 200 watts per channel? I heard that the output transistors were different, but truly I don't have a clue. I would like to be able to explain to my Friends why the amp was modified. Trust me, they will ask. They think I'm some kind of tech wizard when truth is I just keep digging to get to where I want to be.
Most of the stuff I scrape off the walls on my journey tend to stick with me. Then again, small chunks fall off and I'm lost in bass.
So if you could help me hold my head above water and understand this in a short version, I'd be digg'n on ya!
Thanks, Al.

 

[Northwinds]

Bigger tranny, bigger caps and extra output transistors is the difference between the two from what I see/read. Why would you think WOPL'ing a series II would bring it to 400 specs?

 

[laatsch55]

Basically output wattage is directly related to "rail" voltage, or the voltage available to the output transistors to do the final current amplification. The volt amp stage boosts voltage and the outputs boost current. More rail voltage, more wattage. White Oaking a 700 does not make it a 400, quite the opposite, there are small gains realized with the WO boards in the 10-15 watt range with the Fully comp version. The deviation in watt ratings is a result of some transformers being "hot" or ":cold". Depending on the amount of turns on the secondaries, whether the tranny winder was smoking the really good stuff or was out usually resulted in some wild windings.
I have seen 400 rail voltages run fom 78 volts+/- DC (factory specs called for 80) to over 108.2 with the average at 81.
The 700's have a factory rail voltage of 100 +/- volts DC. I've seen those between 98 and 108. The factory 700's were capable of 450 watts just before clipping, advertised spec was 350. I've seen power outputs between 445 and 525, again depending on rail voltage.

 

[laatsch55]

When White Oaked you have a new amp internally that is dead quiet, better signal-to-noise ratio, more robust, modern outputs with a MUCH HIGHER safe operating area , better soundstage, less residual noise, better in almost everyt spec you care to compare, and it will live another 30 years.

 

[Lost in Bass]

So it's the transformer in the power supply that makes the difference? Huh, who would'a thought.
I'm not debating White Oak, I want this. Just trying to pick up some basics is all. Thanks Lee. And Northwinds.
Al.

 

[laatsch55]

Welcome Sir..

 

[Lost in Bass]

I absolutely love mention of the tranny winder guy. Poor slob stuck with a dead end job.
We used to roll trannys downtown back in the 70's.
We smoked a few PL's back in the rock show days. I think it was related to a low ohm load on the amp. How does the WO mod change the amp's ability to handle low ohm loads? I'm not talking crazy 2 ohm car stereo stuff, but how about 4? I heard 4 on each channel (stock PL) would be like bridging it. But something about floating ground or open ended on the output prevents bridging? What's that?

Look here now. The only reason I mention bridging is because I'll be driving a mono 18" sub. I'm going to experiment with a 4 ohm DVC driver, so I wonder how the WO modded 700 II would handle 4 ohm per channel? I plan to mono (sum) the sub, so I could send a sum to each VC but it would only be 4. I could wire the VC's in series for 8 and then bridge the amp. Joe tells me to proceed cautiously. I don't know. Just trying to be active with my disability, you know. Just trying to learn. Hope my ignorance does not offend you. Some people get drug through the mud.
Thanks for putting up with me, Al.

 

[laatsch55]

None of that here Bud. A 700 will handle a 4 ohm load but you better have a good fan. The 700's heatsinks were wholly inadequate, I can shut down a 700 on overheat driving my K's, and they are not a difficult load, so yes it's doable but have a good fan setup that can be a couple muffin fans blowing on the heatsinks or a 20 incher set right on top of the complete amp blowing downward, (I've done this and have pics somewhere, in a thread here too). So has Ron, Northwinds.

If you series a set of voice coils the amp loses it's damping factor and has a lot less control of the moving mass of the woof, but to parallel a set also cuts that 4 in half to 2.

 

[laatsch55]

The original tranny winder at Phase Linear was Bob's brother, and that's where most of the variations occur...

 

[Lost in Bass]

Did not know Mr. Carver had a brother, only an x-wife that stole his empire.
I have two muffins cooling my heat, I can send you the porn pix.
I never heard that "loss of damping" by way of 4+4 degrates straight 8. What's the diff?
Stop making me think, I need to slow down. I'll take a nap and come back at 'cha if thats OK?
Thanks, Al.

 

[Northwinds]

Did not know Mr. Carver had a brother, only an x-wife that stole his empire.
I have two muffins cooling my heat, I can send you the porn pix.
I never heard that "loss of damping" by way of 4+4 degrates straight 8. What's the diff?
Stop making me think, I need to slow down. I'll take a nap and come back at 'cha if thats OK?
Thanks, Al.

Al, throw some Metal on and crank, best medicine of all!!!

 

[Lost in Bass]

You can drive a Klipsh Horn with a transistor radio, so if you are shutting down PL's with your KH's I would look into that.
Right?
I should shut up, should'nt I?
Sorry, Al.

 

[jbeckva]

You can drive a Klipsh Horn with a transistor radio, so if you are shutting down PL's with your KH's I would look into that.
Right?
I should shut up, should'nt I?
Sorry, Al.

When Lee says he's shutting down PL's with KH's, that's at SPL's that have been known to crack TV screens and pop light bulbs in his basement (he's not BS'ing... there are pics buried somewhere here in one of the earlier threads). Not a valid comparison. Not a problem with the amp... more like ... well.. that's our Lee...

 

[Lost in Bass]

Hey Windy, you guys up there are cool. I know a couple gals in Con. that have a condo in Orlando. The fishing is horrible. Lots of tittie bars, though. I worked at one while I was attending Harley school at MMI. They made me suck their nipples through the small rings before they got up on stage. Apparently the engorged blood in the ring would hold the nipple erect, thereby satisfying the patrons.
I ran into those Con. gals in a stupid corner bar and stayed with them for my tenure. It was horrible, woman can be so competitive, damn near wore me out.
Dude, got a name? Mine's Al.

 

[Northwinds]

When Lee says he's shutting down PL's with KH's, that's at SPL's that have been known to crack TV screens and pop light bulbs in his basement (he's not BS'ing... there are pics buried somewhere here in one of the earlier threads). Not a valid comparison. Not a problem with the amp... more like ... well.. that's our Lee...

Bwahahahhahahaaaa, someday I hope to be the homewrecker that Lee is but I am trying hard. Wife already fled the kitchen and my wall clock fell off the wall just now, Glad that it is so loud in here or Deb would have heard it hit the floor. Now if I can get it back together again quickly... I might save myself an asschewing. Debbie can be quite vocal when irritated, like WOPL loud LMAO

 

[Northwinds]

My name is Ron, pleased to meet you Brother!

Sounds like sucking nipples was a job perk In my younger days, I would not let a chick do a lapdance on me unless she was willing to drain the hose orally after, nothing worse then blueballs that you pay for

 

[Lost in Bass]

Hey JB, thanks. I must get to know that man. My friends notice someone cool, we say he's one of us.
Al.

 

[Lost in Bass]

Ron,
I had to turn out the cushions on the lap dance couches to clean the mirrors from the girls hand prints. That's right. A custodian. What a lowly job. Anyway, you would not beleave the cake I found every night under those cushions. Shared it with my girls because it was part thiers anyway. They loved me. The condo girls got old because of the competitive of it I suppose.
Anyway, thanks for name sharing!
Al.

 

[Lost in Bass]

I toured with a band that had me as drum tech. I sat behind the drummer and fixed anything that came up. His monitors were two stacks of 15's. His gong suspended between the monitor stacks. I sat between the gong and the musician. 124 db game time one time. Normal 110~115. He had his monitors EQ'd for 400hz and 1khz. Everything else dumped. I kind of grew up on his kick sound. So I have a pretty good idea what it sounds like.

Now that I'm older 61 year old senior citizen on disability, I would like to take the gear I have left and build a nice little stereo that I can take to the old folks home when time comes.

Thanks, Al.

 

[laatsch55]

A WOPL 1000 IN THE OLD FOLKS HOME!!!!! That's what I'm talkin about!!!~