Dave's WOPL 700B build #1

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
 
:happy7:With 3 fins you could hang it upside down in your closet....:happy7:
 
laatsch55 said:
Wonder where you've been all day. I guarantee you'll be picking your jaw off the floor...
Click to expand...
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...
DSC_5717_3862.jpg
 
Nice rig, Is that a clear or tinted cover for the PL-71?
 
premiumplus said:
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...
Click to expand...

Nice Dave...

Why do builders always put windows in the wrong places? :-)
 
premiumplus said:
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
Click to expand...

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

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



Dave----

NICE!!!!
 
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.
 
premiumplus said:
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.
Click to expand...

Nice that you were able to get the matching walnut cabs for each of the 700s
 
laatsch55 said:
Did ya run a frequency response sweep??
Click to expand...
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:laughing1:
 
Before WO conversion-------
 

Attachments

  • Stephens PL 400 Frequency Response Graph.jpg
    Stephens PL 400 Frequency Response Graph.jpg
    91.3 KB · Views: 58
  • Stephens PL 400 Frequency Response Table.jpg
    Stephens PL 400 Frequency Response Table.jpg
    97.3 KB · Views: 50
After a WO conversion----
 

Attachments

  • Stephen's PL 400 Post White Oak Frequency Response-Graph.jpg
    Stephen's PL 400 Post White Oak Frequency Response-Graph.jpg
    88.5 KB · Views: 57
  • Stephen's PL 400 Post White Oak Frequency Response-Table.jpg
    Stephen's PL 400 Post White Oak Frequency Response-Table.jpg
    97.5 KB · Views: 45
Gepetto said:
Nice that you were able to get the matching walnut cabs for each of the 700s
Click to expand...
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...
 
You must log in or register to reply here.
Back
Top