Cory's Phase Linear 2000 Ser I Unit #2

[laatsch55]

Got any just laying around??

 

[BigSkyCory]

Ok thanks for the tracking # Lee. Let me know when ya ship the big beast.

Cory.

 

[laatsch55]

Will do, should be around Wednesday.

 

[Gepetto]

In the manufacture of the tensioners, were they consistent in their operation??

We used tension arms that were linked together by a single extension spring to form the tape tension. A position control servo would maintain proper positioning of the tension arms. On start stop transients, the tension arms would move in tandem, thus the tape tension was maintained as constant (except for the acceleration of the mass of the tension arms, which were hogged out magnesium for low mass)

 

[laatsch55]

Did you get some patents in the developement of said transports??

 

[BigSkyCory]

Looks like it made it here, must be sitting in a truck until Monday.

 

[laatsch55]

Glad to hear it Cory.

 

[laatsch55]

So Mr. Joe, if a 4739 is toast, what's a mother to do??

 

[Gepetto]

Lee
I will look later on today to see what can sub for the 4739.

 

[laatsch55]

That would be greatly appreciated Mr. Joe. I have a 2000 Ser II that is that way. Haven't looked through my parts yet. Used to have some 4739's. Taiwan and indonesia sourced.

 

[NavLinear]

Too bad Brown Dog hasn't come up with an adapter board to replace this IC.

When searching I noticed a couple of references to a guy in Milwaukee. His place of business is named ACEffects and based on what I read he made or had someone make a drop in replacement potted hybrid for the 4739 dual opamp IC.

http://www.aceffects.com/

http://www.diyaudio.com/forums/solid-state/100740-preamp-opamp-upgrade.html

http://www.gearslutz.com/board/geekslutz-forum/531845-looking-replacement-4739-op-amp.html

 

[laatsch55]

You bored today or what??

 

[laatsch55]

I'll be calling aceffects Monday morning....

 

[NavLinear]

You bored today or what??

Must be - time to get off my ass. A barbeque is beginning to sound good right now.

 

[NavLinear]

You bored today or what??

Keep us posted - It'll be interesting to see if he still has these and what they look like.

 

[laatsch55]

Tramp, didn't invite me.



Joe, ya tried these yet??

 

[Gepetto]

If I were you Lee...

I would be dead bugging a much better op amp in that board location. It is a 14 pin DIP so should be straightforward to do. Put a socket in the location and use the DIP headers to hold the dead bug, looks neat and allows going back to stock later on.

 

[Gepetto]

Tramp, didn't invite me.



Joe, ya tried these yet??

Do I see something about sea salt on the wrapper Lee? If yes, I havent tried those yet.

 

[NavLinear]

Tramp, didn't invite me.



We'd be done before you got here! It was going to be venison at the ranch but that canked - so it's chicken at home.

 

[laatsch55]

OK, standard sockets won't do eh?? What's your recommendation for a replacement?? Then take the dead bug pinouts and run them to the Original pins on the socket they correspond to??