Dave's WOPL 700B build #1

[mlucitt]

I usually point the slit to the locator tab on the TO-5 transistors, which places it nearest to the emitter for ease of identifying the correct lead when probing. It is consistent but maybe not ideal for heat dissipation in the vertical plane.

Mark

 

[laatsch55]

With 3 fins you could hang it upside down in your closet....

 

[premiumplus]

Wonder where you've been all day. I guarantee you'll be picking your jaw off the floor...

My jaw's STILL on the floor. But now I've got both 700B's fully upgraded to WOPL 1000's (+/- 110.5 and 108.7 VDC on the main rails).
It's a major wow factor, even at low volume levels. Having that kind of power reserve makes all the difference, and the White Oak Rev. D control boards coupled with new output transistors make these old amplifiers absolutely killer. They're dead ass quiet too, I can turn the volume up full and I hear no hiss and barely a bit of hum. I'm sure that the hum will be completely gone with new filter caps, properly bypassed.
I need to install a dc protect board in amp number two, I'm expecting that in the mail today or Monday. Here's a picture of my studio. The Dahlquist DQ-10 and DQ-1W speakers are in the living room, located to the left in this picture's perspective. I have JBL L-36 Decades hooked up and the amps are sitting on Optimus 7 speakers from Radio Shack, 1974.
I am expecting my Oppo BDP-105 to show up on Wednesday...

 

[BubbaH]

Nice rig, Is that a clear or tinted cover for the PL-71?

 

[Gepetto]

My jaw's STILL on the floor. But now I've got both 700B's fully upgraded to WOPL 1000's (+/- 110.5 and 108.7 VDC on the main rails).
It's a major wow factor, even at low volume levels. Having that kind of power reserve makes all the difference, and the White Oak Rev. D control boards coupled with new output transistors make these old amplifiers absolutely killer. They're dead ass quiet too, I can turn the volume up full and I hear no hiss and barely a bit of hum. I'm sure that the hum will be completely gone with new filter caps, properly bypassed.
I need to install a dc protect board in amp number two, I'm expecting that in the mail today or Monday. Here's a picture of my studio. The Dahlquist DQ-10 and DQ-1W speakers are in the living room, located to the left in this picture's perspective. I have JBL L-36 Decades hooked up and the amps are sitting on Optimus 7 speakers from Radio Shack, 1974.
I am expecting my Oppo BDP-105 to show up on Wednesday...

Nice Dave...

Why do builders always put windows in the wrong places?

 

[premiumplus]

Nice rig, Is that a clear or tinted cover for the PL-71?

Tinted. I thought they all were. It's kind of a grey tint...

 

[mlucitt]

My jaw's STILL on the floor. But now I've got both 700B's fully upgraded to WOPL 1000's (+/- 110.5 and 108.7 VDC on the main rails).
It's a major wow factor, even at low volume levels. Having that kind of power reserve makes all the difference, and the White Oak Rev. D control boards coupled with new output transistors make these old amplifiers absolutely killer. They're dead ass quiet too, I can turn the volume up full and I hear no hiss and barely a bit of hum. I'm sure that the hum will be completely gone with new filter caps, properly bypassed.
I need to install a dc protect board in amp number two, I'm expecting that in the mail today or Monday. Here's a picture of my studio. The Dahlquist DQ-10 and DQ-1W speakers are in the living room, located to the left in this picture's perspective. I have JBL L-36 Decades hooked up and the amps are sitting on Optimus 7 speakers from Radio Shack, 1974.
I am expecting my Oppo BDP-105 to show up on Wednesday...
View attachment 11426

I thought those JBLs looked familiar. I have four for the front and back of the HT. Love them.

Mark

 

[laatsch55]

C'mon Mark, fess up, what else ya got??



Dave----

NICE!!!!

 

[premiumplus]

Thanks, guys! I wish I could have afforded all this when my ears were still young and I could hear above 8kHz!
It's amazing, even I had to flatten the high frequency EQ and turn down the tweeter L-pad on the speakers. Very cool.

 

[laatsch55]

Did ya run a frequency response sweep??

 

[Gepetto]

Thanks, guys! I wish I could have afforded all this when my ears were still young and I could hear above 8kHz!
It's amazing, even I had to flatten the high frequency EQ and turn down the tweeter L-pad on the speakers. Very cool.

Nice that you were able to get the matching walnut cabs for each of the 700s

 

[premiumplus]

Did ya run a frequency response sweep??

Not on the top end, but I noticed that it's flat to at least 20 Hz or below when I was testing the DC protect circuit.
I'll say this...it SOUNDS really, really, really good. Best stereo I've ever heard, and I've heard a couple

 

[laatsch55]

Well, let me post a typical WO FR sweep.....

 

[laatsch55]

Before WO conversion-------

 

[laatsch55]

After a WO conversion----

 

[premiumplus]

Nice that you were able to get the matching walnut cabs for each of the 700s

Yes, I got those a few years ago, before they got so expensive. I lucked out, and got them from different sellers, at different times, and they look like they were produced on the same day...