Roland Super Cube 60 Squeal Help

[misterc57]

How would a TRS jack work? There is no switch on it and only 3 lugs.

[misterc57]

What about something like this? https://www.parts-express.com/Rean-N...oaAs_UEALw_wcB

[misterc57]

A single switch version is available from the same supplier, search the website.

Found it, but not the right fit either.

Looks like I need to home-brew a solution. Right now I have the original jack back in there. It works with two exceptions. It makes a horrible pop noise when inserting the cable. Once inserted it is okay but if the plug moves the awful squeal comes back.

[g1]

What about something like this? https://www.parts-express.com/Rean-N...oaAs_UEALw_wcB

Yes, that's what I meant, a TRS with switch contacts. I'll try to draw something up.

I guess you cleaned out the original and checked for any bent or damaged contacts?

[misterc57]

Yes, that's what I meant, a TRS with switch contacts. I'll try to draw something up.

I guess you cleaned out the original and checked for any bent or damaged contacts?

I cleaned and inspected it. I cannot get access to any contacts to bend due to its housing.

I am trying to understand the switching on the Drive jack; In the schematic the tip (5) looks un-switched. Pin (2) and (3) is the only switching, with one or the other to ground?

A TRS jack drawing would be great!

Thank you

[g1]

Yes, the tip of drive jack is non-switched.
I hope this will do it. The schematic shows different grounds for the switch part and the jack, but I think this will work.

[misterc57]

Yes, the tip of drive jack is non-switched.
I hope this will do it. The schematic shows different grounds for the switch part and the jack, but I think this will work.

Interesting. I will order the jack and get back with the results. May be a couple weeks.

Thank you!

[Jon Snell]

Make sure you purchase the correct jack sockets!
They have extra contact switching on the 'drive' socket.

[g1]

Make sure you purchase the correct jack sockets!
They have extra contact switching on the 'drive' socket.

The method I suggested in post #21 relies on the 'natural' action of a mono plug shorting together the ring and sleeve of a TRS jack.
If someone decided to try it with a TRS cable, it would not work right.

In this particular case, the original 'normal' jack is remaining in use, and the cliff style jack is replacing the 'drive' jack.

[misterc57]

Yes, the tip of drive jack is non-switched.
I hope this will do it. The schematic shows different grounds for the switch part and the jack, but I think this will work.

I finally got the jack and tried this but it did not work.

When I turn on the amp (volume at zero) there is a different very loud horn sound. If I plug in a guitar, there is a different loud buzz sound. Both of these sounds will knock you out of your chair.

Now that I have the new 6 pin jack it will be quick to try more configuration suggestions. I am hopeful that something will work.

On the input jack board I removed the drive jack #2 and soldered a wire to pins 5 for the drive, and pins 2 and 3 for the switching. It is quick to clip jumpers from these wires to the new jack.

Pin 1 is ground and is jumped to the new input jack.

Thank you

[misterc57]

I mounted J1 to the panel and now have no more squeal. However the drive plug signal is not working.

The tip pin 5 is 133K to ground with cable inserted and also not inserted.

[g1]

Can you post some pics? Did you use the exact Neutrik Rean NYS212 ?

[misterc57]

Right now it is a spaghetti of clipped wires, I must have had a bad contact as it is now working per g1 wiring diagram. Yay!

I will solder it up and send pics of the finished work.

Thank you!

[misterc57]

Working great! Thank you