Hi All,
It's so nice to find a place where people have a common interest in Phase Liner. I'm new to the forum, but not to PL. My PL 700 Series II was purchased new in 1980 and it's been a real joy to my ears over the years. Replaced the output transistors when they fried in the 90's with MJ15024's. Unfortunately its dead again and as I start to debug the problem I was happily surprised to find this place.
My system is all old stuff, but it keeps me happy:
Pre: SAE 2900
Amps: Phase Liner 700 II, Carver TFM 15CB
Other: Phase Linear 5100 II tuner, RG Pro 16B Dynamic Processor, Audio Control Phase Coupled Activator, Yamaha PX-2 with Ortofon MC20 & MCA-76 pre, Techniques SL1700 with Stanton 681, Magnavox CDB650, JVC KD-25 Cassette.
Speakers: Ohm I, rear channel MCS 12" 3 way redone.
I just purchased a Hantek DSO4102C Digital Oscilloscope with waveform generator for the debugging occasion. Amazing how cheap scopes are now.
Seem it's not the usual problem. When it happened I was cranking it quite loud for an extended period, with a fan on it to keep it cool. All seemed fine, then one channel dropped out. I lowered the volume to low and tried to find a bad connection, then a minute later the other channel quit. As with the first channel there were no pops or distortion, just quit.
What I know so far: The fuses are all intact. The panel meters still work normally showing output. No output transistors measure shorted with a DVM. None of the diodes or transistors seem shorted on the PL36 board, except maybe D104 and D204 which both measure .1 ohms in circuit. Nothing at the speaker terminal, totally dead.
I'm always interested in any thoughts or comments you may have. Hopefully tomorrow I'll set up the scope and waveform generator and see what's going on.... Let the fun begin. I'll keep you posted as to how it goes. Nice to meet you all.
Regards,
Bill
It's so nice to find a place where people have a common interest in Phase Liner. I'm new to the forum, but not to PL. My PL 700 Series II was purchased new in 1980 and it's been a real joy to my ears over the years. Replaced the output transistors when they fried in the 90's with MJ15024's. Unfortunately its dead again and as I start to debug the problem I was happily surprised to find this place.
My system is all old stuff, but it keeps me happy:
Pre: SAE 2900
Amps: Phase Liner 700 II, Carver TFM 15CB
Other: Phase Linear 5100 II tuner, RG Pro 16B Dynamic Processor, Audio Control Phase Coupled Activator, Yamaha PX-2 with Ortofon MC20 & MCA-76 pre, Techniques SL1700 with Stanton 681, Magnavox CDB650, JVC KD-25 Cassette.
Speakers: Ohm I, rear channel MCS 12" 3 way redone.
I just purchased a Hantek DSO4102C Digital Oscilloscope with waveform generator for the debugging occasion. Amazing how cheap scopes are now.
Seem it's not the usual problem. When it happened I was cranking it quite loud for an extended period, with a fan on it to keep it cool. All seemed fine, then one channel dropped out. I lowered the volume to low and tried to find a bad connection, then a minute later the other channel quit. As with the first channel there were no pops or distortion, just quit.
What I know so far: The fuses are all intact. The panel meters still work normally showing output. No output transistors measure shorted with a DVM. None of the diodes or transistors seem shorted on the PL36 board, except maybe D104 and D204 which both measure .1 ohms in circuit. Nothing at the speaker terminal, totally dead.
I'm always interested in any thoughts or comments you may have. Hopefully tomorrow I'll set up the scope and waveform generator and see what's going on.... Let the fun begin. I'll keep you posted as to how it goes. Nice to meet you all.
Regards,
Bill
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