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Thanks for all of that advice. You’re right ! There’s an oscillator on the console, would that work if I used it to feed signal to the channels for testing ?

Yep, all of the above settings work as they should on channel 7, that is only after gently moving the card back and forth until I’m getting output, as per my video. Basically the channel itself seems to be working fine, but there must be a shorting of the connection or dry joint somewhere that I...

I’ve just reflowed all of these joints we mentionned earlier, but it did not make a difference.

This was actually the first thought that went into my mind as I woke up this morning. For all of my testing, the console has to be set up in the normal way so that I can access the jacks on the back of it to send and recieve signal to and from it, but in order to actually work on the channels...

Here is a YouTube link of a short video that I’ve just made, it’s silly really, but wiggling the channel 7 card actually gives me signal…! It seems it’s the way the channel itself is soldered to the buss wires that gives me trouble… Youtube link : Hudson Channel 7

I understand that…trouble is it would be much easier to test the boards if I could just take them off the chassis individually without having to desolder everything that’s hard wired, but I really don’t have the confidence to do that as it will most likely create more problems

Here are a couple of pics of channel 7, I really hope they can be helpful.

Thanks again. I know…shouldn’t have even attempted the recap at all. I still managed to get 14 channels working out of 16, replaced 4 transformers and 4 potentiometers which were mounted from the underside of the PCB and almost impossible to find, which is not so bad after all for a complete...

After swapping the bad transformers, everything started working again ! It would have been so simple to close the lid and patch the console but noo I had to change all the 300 electrolytic capacitors first…which I did…now I have : - channel 7 receiving signal but not sending any output to the...

Indeed !! Actually I have 8 regular 8v lamps and 8 fuse type 8v LEDs that I’ve purchased on the French equivalent of Craigslist.

Thank you so much ! Actually, on my console the meter lamps are of the fuse type, they seem to be clipped. I have bought 8 regular lamps (for my Tascam 58 reel to reel) and 8 fuse type lamps.

Hi, I’m in the process of selling my M512, and meter lamps number 5&6 are dead. Does anyone know the process to follow in order to open the meter bridge to have access to the Vu meter lamps ? Thank you

No actually it's the other way around : when switching transformers, the issue followed the transformers : bad transformers soldered in good channels = no sound; good transformers soldered in bad channels = good sound.

Since I'm getting the same reading when measuring the BAD secondary coils' black and blue cables as when the MM is on without the probes touching, I assume there's an open coil on the secondary of that transformer.

EDIT : When doing the same test with channel 5, the VU meter sort of reacts to the MIC input (the louder I talk the higher it shows on the VU), however the sound I get is much quieter than on other channels and there is a lot of background hiss on the output. When I set the gain at full, it does...

I've made 3 videos where I go through the steps you've mentionned : Pin 1 goes to ground on all channels, pins 2 & 3 are indeed connected to the primary coils of the transformer (the red and green wires that are connected to the PAD switch). Primary coil readings : 0,22 on each channel...

Hello again, I have first checked the wiring of the XLRs, they are all the same on each channel. I have then tried to measure the transformer wires with the multimeter, and here's what I have : there is 1 red wire and 1 green wire that connect to the PAD switch. I've put each of the...

Thank you so much, again ! I will try this next week and give you a detailed report.

Hi everybody, I recently purchased a vintage recording console, the Hudson CS 1604 DO which was made in France in the early 70's and was widely used in radio at that time. Probably most of you won't have heard about that console because it's really niche, but it's been giving me some kind...

I will ! Now all that's left to do is to replace two VU bulbs and I'm good !