Russ' Phase Linear 700B Going Fully Comp!!!!!!!

[laatsch55]

The white grease monster really had it's way with this one. Took awhile but it's clean. A closeup of the binding posts, for those of you using Don's board , the posts can be sucked clean of solder enough to take the 4-40 nut off an d reuse them.

 

[laatsch55]

Holes drilled to relocate the AC mains in and fuseholder. Test fit on the board before wiring. Joe's assembly notes called for 4-40 scews to hold the thermoswitches and the head on the inside of the chassis with the nuts on the outside. I tried some 6-32 stainless allen heads and the head actually fits inside the thermoswitches footprint, so there's another option....

 

[laatsch55]

Ac and fuseholder in and soldered...

 

[laatsch55]

Power wiring done, signal wiring next..

 

[Gepetto]

Power wiring done, signal wiring next..

Looks like Lee is trying to pull ahead here... I had to spend the day doing other stuff. Maybe I will have some time to catch up later on...

 

[laatsch55]

I'm on your tail Dude....

 

[Gepetto]

I'm on your tail Dude....

That is good Lee, I told you earlier I expected you would be ahead of me.

 

[laatsch55]

Yep, trying to get this done and tested. Getting kind of excited Joe. Been anticipating this for a couple years....pluggin away...

 

[laatsch55]

Boards done..

 

[jbeckva]

Boards done..

Purdy damn boards... Get me hands on a pair soon, eh?

 

[laatsch55]

They're gorgeous Jer. I would think real soon...

 

[laatsch55]

Just countersinking does not allow installation without peeling some material off the insulators....I will enlarge the holes.

 

[Gepetto]

Just countersinking does not allow installation without peeling some material off the insulators....I will enlarge the holes.

That is what I guessed Lee. I first went up 4 thousands with a B drill which was still skiving material off. Getting to a C drill another 4 thousands up made it go. Still a lot of tolerance accumulation mating 2 parts that were produced with the precision that 40 years ago could render.

 

[laatsch55]

Amen Joe. Had to check though..if I would have countersunk half the thickness of the HS it would have went but then you have nothing holding tight.

 

[laatsch55]

Power went out last night just as I got to the third HS. On the 2 completed it took some wiggling and prodding but they all went without forcing them. Good cure there Joe...still held very snug in alignment with the extra slack...

 

[Gepetto]

Power went out last night just as I got to the third HS. On the 2 completed it took some wiggling and prodding but they all went without forcing them. Good cure there Joe...still held very snug in alignment with the extra slack...

Yes that extra 8 thousandths is what it needs to barely go Lee. Just carefully check for no metal filings left over and no burrs on the near side where the transistors mount.

 

[laatsch55]

I do Joe, I take a pin vise and a countersink and touch em up by hand...

 

[laatsch55]

Couldn't get my countersink mounted in my pin vise, but did find a long shank 13/32 that was uber-sharp. A little rat tail file work on the inside of the holes to smooth em up and hand dress the "push-through" and we're good to go.

 

[laatsch55]

WHOA NELLIE!!! Joe, I have a whole row that lacks about 5-7 thou . Take a look, we might have to relieve the chassis holes too.... Joe, what I did not do is lay the HS's on the bare chassis without the insulators, that might have given us an idea on how far the chassis is off from the HS holes.... Might drop the boards out and check that anyway...

 

[laatsch55]

Joe my hole mics are at the shop and I just checked my "C" drill. It's endersized at .238. I have a "D" that mics .245. I'll try that and see where we stand.