Pacific Recorders BMX 14

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Pacific Recorders BMX 14

Postby andrea19837 » Sun Feb 12, 2012 12:55 pm

I just bought this baby, anyone know something about? anygood?

andrew.

http://www.flickr.com/photos/76290843@N02/
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Re: Pacific Recorders BMX 14

Postby Jim Williams » Mon Feb 13, 2012 11:54 am

Looks like an early 1980's version. Jensen JT-115KE 10/1 ratio input transformers and a 5534 opamp. These were made here in Oceanside, CA and are built very well. Later models have Aphex designs all over them including Aphex VCA's.

You can lower the input noise and extend the bandwidth of the mic preamp by using the JT-13KC 1/5 ratio transformer and using a lower noise opamp like a National LME49870. You will need to 1/2 the gain set resistor value off the gain pot to recover the lost 6~7 db of gain. That will also buy you 6 db less minimum gain for higher output mics and sources.
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Re: Pacific Recorders BMX 14

Postby andrea19837 » Mon Feb 13, 2012 3:32 pm

Hi JIM. PS: I have my old soundcraft 500 waiting for You soon :) anyway :)

The mic/preamp: uses a Jensen 6110K APC and line Imput Je11P IPC the Output transformer on BUSS ARE: JE123A

DO you know something about this one?

And Why they use tantalium caps in PSU in the -+ 16 audio rail? i think to remove and use panasonic FM 105 degrees instead of tantalium, also one is burst and a get noise over the all console.

andrew.
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Re: Pacific Recorders BMX 14

Postby andrea19837 » Mon Feb 13, 2012 3:46 pm

I found that datasheet about Imput MIC JENSEN:


http://home.mindspring.com/~redbugg/JE6110014.jpg
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Re: Pacific Recorders BMX 14

Postby andrea19837 » Tue Feb 14, 2012 10:40 am

I check the PSU and FInd old tantalium caps burst. do You suggest me to change it for another type?

andrew

Here photo and PSU Schematic

Image

Image
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Re: Pacific Recorders BMX 14

Postby Jim Williams » Tue Feb 14, 2012 12:18 pm

I would replace the cap off the regulator reference pins to 100 uf/50v Panasonic FR series. Then I would replace those output 1.5 uf tant's to 1000 uf/25v Panasonic FR caps with a .1 uf film cap bypass like a Wima MKP-2. This print doesn't show the mains filter caps, I would replace them with the biggest value Nichicon VZ series caps like 15,000 or 18,000 uf's that will fit. Then you may want to up the rating on the rectifier diodes or bridge.

That input transformer has 600/150 ohm input taps. At 150 ohms it behaves like a JT-115. The JT-13KC will lower the noise a bit and extend the bandwidth. It's a better noise match to a low noise opamp, the 5534 included. JT-11's are 600/600 line input transformers, they are fine for that.

The last Pacific Recorders console I went through was a 16 channel that was the Rick Dee's console at KISS-FM. It had 4 band parametric EQ done very well and Aphex VCA's for the faders. I ended up using some precision Analog Devices class A opamps and removed all the electrolytic signal coupling caps. It sounded super open.
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Re: Pacific Recorders BMX 14

Postby andrea19837 » Wed Feb 15, 2012 12:37 pm

Thank Jim.

Very good suggestion.

I'm gonna check it out.

this baby seem to kick very hard, nice console.

andrew.

Call you soon for soundcraft :)

thank
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