700/B/Ser II Transformers

[Gepetto]

I'm interested too in what Joe has to say. I got the PS figured out pretty much but would like to hear more about paralleling the backplanes. I have time to finger the build out BEFORE I do something too crazy and have to fetch the fire extinguisher.............. I'm up for a different project for sure, just want to make sure it's well thought out or if it's not advisable, I need to know that too.

I think Lee is referring to cascading, not paralleling 2 backplanes in order to drive more output devices

 

[Gepetto]

Damn output transistors are too expensive to keep frying

True statement Perry.

 

[laatsch55]

I think Lee is referring to cascading, not paralleling 2 backplanes in order to drive more output devices

You're so nice Joe......thanks, got CRS lately....

 

[WOPL Sniffer]

So Joe, is any of this crazy shit feasible? We want to blow stuff up, just not the expensive stuff.

 

[Gepetto]

You're so nice Joe......thanks, got CRS lately....

Me too Lee

 

[Gepetto]

So Joe, is any of this crazy shit feasible? We want to blow stuff up, just not the expensive stuff.

yes you can get more out than the 700 has to offer. The 700 suffers from power supply sag under heavy load so stiffening up the power supply load regulation goes a long way toward getting higher power output. To get insane power output levels the configuration needs to switch to bridged output or cascode output configuration

 

[WOPL Sniffer]

yes you can get more out than the 700 has to offer. The 700 suffers from power supply sag under heavy load so stiffening up the power supply load regulation goes a long way toward getting higher power output. To get insane power output levels the configuration needs to switch to bridged output or cascode output configuration

I guess I'll steer towards the bridged with the double toroid Power Supply. First, I'll construct the Blast Curtain....

 

[WOPL Sniffer]

Lee, I'll bring them up on the train so you can test one too....

 

[laatsch55]

Long as you can ride in a coal car....

 

[grapplesaw]

Not sure I follow what you are saying Glenn. The output (emitter) at clip is at most 5 volts away from the rail voltage so if the rails are plus and minus 125 the resulting collector -emitter voltage is 245V which is dangerously close the the absolute max 250V Vce rating.

Thank you for setting me straight Joe. These rails are going to be close then at 118 volts

 

[grapplesaw]

I guess I'll steer towards the bridged with the double toroid Power Supply. First, I'll construct the Blast Curtain....

I will try to put a bridge a 700 this weekend.

 

[grapplesaw]

I just dug up this Service bulletin about bridging

 

[grapplesaw]

Joe, draw this out on a piece of shit paper and send to me....

See if you can understand this explanation. I read a few times and have got the just of it but no way I can draw a high power amp from this.

https://www.ieee.li/pdf/essay/cascode_amplifiers.pdf

 

[WOPL Sniffer]

I just dug up this Service bulletin about bridging

Glen,
Can you post a bigger pic? I cant read it.

 

[Northwinds]

I blew it up Perry, hope you can see it

 

[WOPL Sniffer]

Nope, he has to do it with the original I think.

 

[JustMike]

Hope these help.
Jm

 

[JustMike]

http://web.archive.org/web/20080704200449/http://www.hometown.aol.com/phasetek/faqmono.html

Hope these help.
Jm

 

[WOPL Sniffer]

Damn, ANOTHER way to do it.... Isolating the amp and preamp this time.....

 

[oldphaser]

Triad G-336 Literature (Phase Linear Bridging Information)

Here are some additional scans (in a pdf format).

Ed