Phase Linear Model 700

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#22
Re: Phase Linear 700 Clone???

Mark A. Gulbrandsen said:
Ok, I have to admit it... the Phase Linear 700 IS a dinosaur but it IS also a very powerful amp running +/-100 volt rails. It was Flame Linears best sounding amp as well. With up to date semi's, a real actual power supply with some real actual caps instead of the dinky doos they used plus some other mods I wonder if this dinosaur could be brought back alive to the higher performance standards we are used to today??? It might be fun to see what this old Quasi circuit can do with modern semis.

Should we call this a PLone instead of a CLone... then there is the ongoing KLone of the KSA-50?

P.S. You can all make fun of me for posting this but LuckyLyndy suggested this to me so here it is... so make fun of him too!

Mark
Click to expand...

Hi MARK,

Its good to see your instincts to fuel this Dinosaur, could we all see the schematics first and then do some MODS on it....Its a fun for us to Hotrod Old amps......

Is this one is the schematic.

http://hometown.aol.com/phasetek2/pl20.jpg

regards,
K a n w a r
 
#23
You guys must be hard up for excitement to to play with a so so sounding Quasi-Complementary piece of junk like this. For its day it was ok I guess, nothng to write home about.

How about something cheap to buy and probably a heck of a lot better sounding? Lets play with commercial amps shall we? Pick up a Altec 9446 or EV 3200 for a song and dance. Its robust power supply in the 90's range is also capable of giving you a tickle if you need it. Side by side with the Flame Linear it probably sounds better and will produce loads of power plus it has a complementary output stage. If your looking for something for bridge mode then flick the switch and she will put out in excess of 1200 watts.
 
#24
Thunder

Mark A. Gulbrandsen said:
It might be fun to see what this old Quasi circuit can do with modern semis.

Should we call this a PLone instead of a CLone... then there is the ongoing KLone of the KSA-50?

P.S. You can all make fun of me for posting this but LuckyLyndy suggested this to me so here it is... so make fun of him too!

Mark
Click to expand...

You're going to steal my DC300A thunder! I'll "one up you" if you do it... I promise. 😉

Cheers,

Shawn.
 
#26
Is this one is the schematic.
Click to expand...

The fun part is that I used to repair these flame throwers back in the early 70's when they first appeared. Thats the B model diagram... its close enough to get an idea of what it is... er I mean was. I just thought I'd post this thread and see what happens..... It was one of the first very powerful amps available to the consumer and it was alot better sounding than the 400 model was. I can't remember if this or the Crown DC-300 was forst on the market... might have been a tie there.

I'm thinking modern semi's and a much larger power supply might just coax a bit better perfromance out of it. There is only so much one can do to it.

Re-doing these old amps is kinda like re-making old movies.....😱

Mark
 
#27
Phase Linear was founded in 1972, years after Crown's production run of the DC300A began. Crown was generating the DC300A on a production line by 1969.

Do it man... just do it and have fun.

I think your project should be called a "Phone"! 😉

Shawn.
 
#28
If Netlist could send me a higher resolution version of the image and someone could send me an actual picture of the bottom of the pcb I may be able to knock it off in an evening.

Is the Netlist homebrew a copy of the original? I would need measured dimensions of the original pcb image of the bottom of the board to control scale.

I won't guarantee jack but if I have the above, I could give it a shot! The reason I offer; it looks far easier than the Crown DC300A. The Crown was a hard labour session.

Cheers,

Shawn.
 
#29
:cop: Ok, I've merged the two 700 threads as they were both going in the same direction. /:cop:

My thoughts: the first thing I see is that we need to go through the BOM of the original and look at what parts we need to substitute, and what we replace them with. Once that is done we can look at either reworking Hugo's layout or creating a new one from scratch. Anyone have any pics of the original boards or general internal layout?
 
#30
I still have the original PCB in front of me.
Give me time to shower it and I'll post pics and the exact dimensions together with the correct schematic.
It is the one of the original 700.
I have the service manual of the last version as well, with the opamp in the front-end.

/Hugo
 
#32
Alright, showered and dried, forgot to discharge the big caps. 😉

It would be nice to see a detailed circuit description as well.
I know for instance that the output stage was build entirely with NPN’s and not with complementary pairs. I believe this was done because at that time it was pretty hard (and more expensive) to produce PNP’s.
Also, I never really understood how the input stage works. Q1 and Q2 being the diff-pair but what is the purpose of Q3/Q4? What is D1 and D2 doing? And so on…
The picture is - as said - the PCB of the original 700 ( PL17). Please wait to post until I posted all the info I have to make it look nice and condensed.

/Hugo
 

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