I am looking for an inexpensive pre-built high voltage field coil speaker power supply. I have a couple of Jensen A12's with 5 to 6k ohm coils, so I am looking for a DC supply about 300 Volts and 100 ma, adjustable voltage or current.
I can see some HP instrument supplies like the HP 6186B DC Supply and also Fisher Biotech FB 650. Since the high impedance coils require low current, I would think the HP lab supplies might work well. The Fisher Biotech supply is for electrophoresis and biology research, so there are a lot of these high voltage DC supplies available since they are used widely to induce gradients in gel beds.
Deep within other PSU discussions a poster mentioned the Fisher FB 650 was a heavy iron design and might have better quality power than other modern circuits. I am not ready to build or purchase a high fidelity PSU and would like to just start with a good quality used supply borrowed from another industry or purpose.
Any ideas?
Jamie
I can see some HP instrument supplies like the HP 6186B DC Supply and also Fisher Biotech FB 650. Since the high impedance coils require low current, I would think the HP lab supplies might work well. The Fisher Biotech supply is for electrophoresis and biology research, so there are a lot of these high voltage DC supplies available since they are used widely to induce gradients in gel beds.
Deep within other PSU discussions a poster mentioned the Fisher FB 650 was a heavy iron design and might have better quality power than other modern circuits. I am not ready to build or purchase a high fidelity PSU and would like to just start with a good quality used supply borrowed from another industry or purpose.
Any ideas?
Jamie
This thread is old, I’m replying because I bought an old Hammond tone cab loaded with two A-12 field coils. I was ignorant of the tech, which is using an electro magnet vs the permanent magnet drivers which were just being invented in the 40s/50s.
FWIW, the field coils were used primarily with organs and radios. The audio amps were tube circuits, and the PS for the field coils was tube based, a transformer and rectifier tube.
I found some mention of the driver performance being “better”, as in more musical and dynamic in the sense of HiFi tube purists.
I have fond memories of the 70s, the traditional two channel stereo with two speakers, usually 2-way or 3-way. A college friend had a set of Altec speakers, an Altec tube power amp, and a nice turntable. Maybe 20w/channel. I can compare my memories of this magical sound to something like a typical 5.1 HT system with 200w or more, playing MP3s via Bluetoothed phone - night and day difference.
FWIW, the field coils were used primarily with organs and radios. The audio amps were tube circuits, and the PS for the field coils was tube based, a transformer and rectifier tube.
I found some mention of the driver performance being “better”, as in more musical and dynamic in the sense of HiFi tube purists.
I have fond memories of the 70s, the traditional two channel stereo with two speakers, usually 2-way or 3-way. A college friend had a set of Altec speakers, an Altec tube power amp, and a nice turntable. Maybe 20w/channel. I can compare my memories of this magical sound to something like a typical 5.1 HT system with 200w or more, playing MP3s via Bluetoothed phone - night and day difference.