phase linear 400

Rob said:
Gene, From my understanding over the years when talking about outputs and lot #'s. When buying a set of outputs I would hope they are a matched set. But in the photo below the Toshiba has an R designation. you want to keep the same letters together because of the GAIN and other characteristics. Its just a better performance when doing that. If you put R's and O's together the amp will work but I like to keep that from happening.
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i ran into a similar situation on the sx1080...the 737s are almost impossible to find...pioneer listed 845s as replacements...both are batwings...the 845s came in 2 variants...only the o version would function as a replacement...i did change out the drivers too...
that was my 1st experience with vintage stereos...
the sx is also a great sounding radio....but, i keep in my mind my first time seeing a phase linear...lol
took my breath..the fire-breathing beast!!!
 
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It was the PL400 wiring diagram for the amp board of one channel in the service manual.
 
well rob, today is your lucky day!!!
just fired up the 8 fin...
tweaked the bias a bit...
and listened to sarah connor...
sooo
i called off the assassins....lol
thanks rob...things worked out just as it was supposed to!!!
i am appreciative...to all...
 

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Rob said:
Gene, From my understanding over the years when talking about outputs and lot #'s. When buying a set of outputs I would hope they are a matched set. But in the photo below the Toshiba has an R designation. you want to keep the same letters together because of the GAIN and other characteristics. Its just a better performance when doing that. If you put R's and O's together the amp will work but I like to keep that from happening.
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As Perry would say...HUH???
 
i now have 3 properly functioning phase linears...
and a pioneer sx1080...
i only need the ps caps for the 200...recap, change to leds and upgrade the caps on the 8 fin....and of course my old 4 fin is truckin along....
waiting a bit on joe to ship things for the wopl build...THANK ALL OF YOU!!!
 

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gene french said:
well rob, today is your lucky day!!!
just fired up the 8 fin...
tweaked the bias a bit...
and listened to sarah connor...
sooo
i called off the assassins....lol
thanks rob...things worked out just as it was supposed to!!!
i am appreciative...to all...
Click to expand...
I loved the sound of that amp. It seemed so warm and I have always loved the huge meters.
 
Rob said:
Gene, From my understanding over the years when talking about outputs and lot #'s. When buying a set of outputs I would hope they are a matched set. But in the photo below the Toshiba has an R designation. you want to keep the same letters together because of the GAIN and other characteristics. Its just a better performance when doing that. If you put R's and O's together the amp will work but I like to keep that from happening.
View media item 32383
Click to expand...
I think I need to run a seminar on the topic of (lack of need for) matching of output transistors and the function of emitter resistors and the local negative feedback that these emitter resistors provide.
 
Gepetto said:
I think I need to run a seminar on the topic of (lack of need for) matching of output transistors and the function of emitter resistors and the local negative feedback that these emitter resistors provide.
Click to expand...
Please do.
 
gene french said:
i now have 3 properly functioning phase linears...
and a pioneer sx1080...
i only need the ps caps for the 200...recap, change to leds and upgrade the caps on the 8 fin....and of course my old 4 fin is truckin along....
waiting a bit on joe to ship things for the wopl build...THANK ALL OF YOU!!!
Click to expand...

rob...check out the differences in the tint in the meters when machines are side by side so to speak....my old 4 fin is much darker....just as joe said it would be....
 
this emblem is for the front of the machine i am building...for my personal use...as a tribute to joes company for his design combined with the original phase linear 400......it is not for commercial use...i think it is a nice thing to do in appreciation of the help and inspiration he has shown me...others mileage may vary....
as joe said in this thread...if he ever finds the time maybe one day he will consider investigating a logo for his business....i dont feel i am stepping on toes...just showing respect...
 
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