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-   -   RCA 44-BX Low Cut Problem (https://www.gearslutz.com/board/high-end/1013341-rca-44-bx-low-cut-problem.html)

1942Banner 13th June 2015 03:10 PM

RCA 44-BX Low Cut Problem
 
Hello, I need your help. I've bought an RCA 44-BX microphone and it sounds great but it hasn't got that big, fat, warm sound. It seems there is a low cut activated. Attached you find a photo of the terminal board. Can you tell me how I need to rewire it to avoid that low cut? Thank you.

http://i.ebayimg.com/00/s/NDgwWDY0MA...2.JPG?set_id=2

ShinyBox 13th June 2015 05:44 PM

there should be no strap between the two center terminals. Like this (terminals are arranged differently, but removal of the strap is the same):

http://www.coutant.org/rca44bx/rcamic3.jpg


Regards

Jon

1942Banner 13th June 2015 06:28 PM

Quote:

Originally Posted by ShinyBox (Post 11117116)
there should be no strap between the two center terminals. Like this (terminals are arranged differently, but removal of the strap is the same):

http://www.coutant.org/rca44bx/rcamic3.jpg


Regards

Jon

Hello Jon, thanks for your reply. I removed the strap between the center terminals - now there's no sound at all...

Do you have another idea what I could try?

ShinyBox 13th June 2015 06:43 PM

Hmmm.

The terminal arrangement is different than my 44BX, and also the ones from the coutant site..

Check out the photos from the coutant site to see if you can sort out how the wiring is arranged. Aside from that, it's something I could sort out if it was here, but you might want to have a tech take a look otherwise (or perhaps another person may happen a long who can weigh in).

RCA Type 44-BX

From what I see in the picture, it looks like the left hand terminal, black wire should be connecting to pin 2 of the xlr, the white wire, to the right, should be pin 3, and the green wire far right should be pin 1 of the xlr, respectively.

The other question is what the state of the ribbon looks like. An excessive stretch or sag to the ribbon can cause low frequency loss.

Regards

Jon

drtechno 13th June 2015 07:06 PM

1 Attachment(s)
oh, it seems your terminal board was reworked in the past. PB31 and 144 had this type of terminal arragement. you disconnect the black wires.

the jumper needs to be in place for the output transformer.

here is a schematic:

1942Banner 13th June 2015 07:25 PM

Quote:

Originally Posted by drtechno (Post 11117250)
oh, it seems your terminal board was reworked in the past. PB31 and 144 had this type of terminal arragement. you disconnect the black wires.

the jumper needs to be in place for the output transformer.

here is a schematic:

Thanks alot for your post. I just had the same idea. Attached you find the terminal arrangement of my 44BX. So I can cut the black cables, right?

https://mail.google.com/mail/u/0/?ui...fef3332_0.1&zw

drtechno 13th June 2015 07:32 PM

Quote:

Originally Posted by 1942Banner (Post 11117277)
Thanks alot for your post. I just had the same idea. Attached you find the terminal arrangement of my 44BX. So I can cut the black cables, right?

https://mail.google.com/mail/u/0/#in...28?projector=1

I would remove one of them. its probably the black wire I see tacked onto the terminal screw side. but I would take a solder Iron and pliers to remove it and tape off the wire or put it on a switch

1942Banner 13th June 2015 08:28 PM

Quote:

Originally Posted by drtechno (Post 11117284)
I would remove one of them. its probably the black wire I see tacked onto the terminal screw side. but I would take a solder Iron and pliers to remove it and tape off the wire or put it on a switch

You were absolutely right. I cut the black cable on the terminal front side (I don't have a solder iron) and now it works. It sounds fantastic. Thank you so much.