PL 700B blown fuses and transistors

mlucitt

Veteran and General Yakker
Joined
Jun 24, 2011
Messages
3,339
Location
Jacksonville, FL
#21
What do you think and can you supply these items and how do I proceed to acquire them? Phase Linear 700B, Serial Number 6415.
I have all these parts for you (we have replaced the 180 Ohm bias resistor connected from the Base to the Emitter of Q11 and Q12 with a 150 Ohm resistor in the same location). We also substitute a single 5.1 Ohm 5W resistor for the two 10 Ohm 2W resistors Phase Linear used on the output Zobel Network. This makes things a little simpler.
PM me with your address and I will send them to you. Or you can order them from Mouser, here are the P/N's you need:
(2) 5.1 Ohm 5W Zobel Resistors.....................279-ROX5SSJ5R1
(2) 0.1 uF 630V 5% Zobel Capacitors............75-MKP1839410634HQ
(4) 10 Ohm 1% 1/2W Bias Resistors..............273-10/REEL-RC
(4) 150 Ohm 1% Q11/Q12 Bias Resistors....660-MF1/2CCT52R1500F
(20) 0.33 Ohm 2% Emitter Resistors..............660-MOSX3CT631RR33G
 

BobPep

New Around These Parts
Joined
Feb 29, 2024
Messages
3
Location
West Hempstead, New York
Tagline
Love spending time with my kids and grandkids
#22
Hi ,

My names Bob, and I'm new to this forum and I just got a beat-up old Model # 700, Serial # 172-27 amp that I'm upgrading.

Are there any pictures (or videos) detailing the installation of the new WO backplane kit along the new WO Control board kit for my amp?

Does the new WO backplane kit contain all the resistors and capacitor that are in the existing amp?

Finally, do you recommend the Phoenix connection option with the WO Control Board kit?

I appreciate any help with my upgrade.

Thanks.

Bob
 

Hexis22

Chief Journeyman
Joined
Dec 28, 2022
Messages
517
Location
Wisconsin
#23
Hi ,

My names Bob, and I'm new to this forum and I just got a beat-up old Model # 700, Serial # 172-27 amp that I'm upgrading.

Are there any pictures (or videos) detailing the installation of the new WO backplane kit along the new WO Control board kit for my amp?

Does the new WO backplane kit contain all the resistors and capacitor that are in the existing amp?

Finally, do you recommend the Phoenix connection option with the WO Control Board kit?

I appreciate any help with my upgrade.

Thanks.

Bob
Upgrading the original 700 with a full White Oak treatment is not for the faint of heart.

The WO backplane boards will not work with the original 700 chassis or heat sinks.. Fortunately WO has replacement housing and heat sinks available.

See a detailed build here: https://forums.phxaudiotape.com/threads/700-series-1-build.11076/
 

George S.

Veteran and General Yakker
Joined
Feb 18, 2020
Messages
4,539
#25
Absolutely. I use them on the backplanes and the control board, twice the amount that most builders use.
Just closely check them for fit on the 700 backplanes, the solder tabs need to be slightly bent to shift them sideways away from a close trace.
 
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