Mark goes at it again... just bought a PL700/II!

MarkWComer

Chief Journeyman
Joined
Nov 1, 2014
Messages
1,474
Location
Gaston, SC
Tagline
Victim of the record bug since age five
Besides, doesn't it have handles?????
Which is why you solder the nuts on the backside of the backplane boards
Just hit me as being a little fishy, worried about stress during the “insert bottom row only” during the initial startup and tests. Just have to be careful!
 

Gepetto

Administrator
Staff member
Joined
May 15, 2011
Messages
7,669
Location
Sterling, MA
Tagline
Old 'Arn Enthusiast
Just hit me as being a little fishy, worried about stress during the “insert bottom row only” during the initial startup and tests. Just have to be careful!
That is what the assembly aid hardware kit is for Mark. To tie in the top row at the same time as you are putting the bottom transistors in.

#6 SS flat washers, #6 nylon washers and the socket head screws.
 

MarkWComer

Chief Journeyman
Joined
Nov 1, 2014
Messages
1,474
Location
Gaston, SC
Tagline
Victim of the record bug since age five
That is what the assembly aid hardware kit is for Mark. To tie in the top row at the same time as you are putting the bottom transistors in.

#6 SS flat washers, #6 nylon washers and the socket head screws.
(I didn't read that far into the process yet...)
(The 400s have screw mounted heat sinks...)
 

MarkWComer

Chief Journeyman
Joined
Nov 1, 2014
Messages
1,474
Location
Gaston, SC
Tagline
Victim of the record bug since age five
Somebody expand my knowledge and understanding here...

B+ and B- fused, B+ and B- unfused...

It doesn’t make sense to me to feed unfused power into a circuit. It seems to me that if there’s a failure in a circuit, you’d want a fuse to take the brunt of the failure. When a failure occurs, current is still applied if it’s unfused, correct?

One of those mysterious things I just don’t get!
 

Gepetto

Administrator
Staff member
Joined
May 15, 2011
Messages
7,669
Location
Sterling, MA
Tagline
Old 'Arn Enthusiast
Somebody expand my knowledge and understanding here...

B+ and B- fused, B+ and B- unfused...

It doesn’t make sense to me to feed unfused power into a circuit. It seems to me that if there’s a failure in a circuit, you’d want a fuse to take the brunt of the failure. When a failure occurs, current is still applied if it’s unfused, correct?

One of those mysterious things I just don’t get!
The fuses for the unfused lines are the picofuses on the backplanes. PL did not have these (it was really unfused except for the main AC fuse) but if you use the WO backplanes, you get this protection level. You are using the WO backplanes so you do not need to be concerned about this.
 

MarkWComer

Chief Journeyman
Joined
Nov 1, 2014
Messages
1,474
Location
Gaston, SC
Tagline
Victim of the record bug since age five
The fuses for the unfused lines are the picofuses on the backplanes. PL did not have these (it was really unfused except for the main AC fuse) but if you use the WO backplanes, you get this protection level. You are using the WO backplanes so you do not need to be concerned about this.
So- originally another opportunity to live up to the moniker "Blaze Linear!"
 
Top