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Bsr eq 14 14xr equalizer spectrum analyzer

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  • High-End Audio
  • Power
  • Audio
Last response: in Home Audio
December 3, 2010 3:07:41 PM

I need a power transformer for my BSR EQ 14/14XR equalizer-spectrum analyzer. The primary winding has failed (It's dead - primary winding shows open circuit). Please, help me find a proper replacement transformer? RBeery@i2k.com

More about : bsr 14xr equalizer spectrum analyzer

December 3, 2010 4:21:12 PM

probably there is a generic replacement if you know what voltages the old transformer was rated at, unfortunately I don't see any schematics around, and you might be better off buying another one, if you don't want to get involved in a major project.
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December 10, 2010 6:22:32 PM

Thanks for your reply. You are likely right. I'm one who is familiar with electronics without much fear of this kind of project except for the lack of available information. This unit has better features than most otherbrands and models and has worked for years. But it just quit recently. I immediately opened it up to find three facts. The power transformer primary is now open (no continuity on any ohms range). There are four taps on the power transformer secondary. I suppose I could estimate the relative turns ratio s by measuring resistance (assuming the secondary is one continuous winding of the same guage wire). Thirdly when I opened it up almost immediately there was still about 14V DC from the winding to ground (coming back from the filter capacitors, I assume). It didn't go down very fast while measuring it so the caps still carried a healthy charge. That surprised me since I would expect the rectifiers to blocked any voltage from showing up on the transformer. I didn't try measuring across the filter caps. Perhape a diode shorted and the primary gave way instead of the secondary. (I didn't see a fuse anywhere.) More daunting yet is the fact that the secondary had four taps with a 4 conductor flat cable going to the circuit board. Too many variables! I even thought of trying to feed perhaps 12 V AC from another transformer across the secondary and let it be ab autoformet to create the other voltages needed. But I don't want to guess wrong and burn up the circuit board. So I am thinking what options I have - including watching for one on eBay. This model doesn't show up very often.

Again Thanks for your reply. Let me know if you have any other ideas I might try. RWB
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December 10, 2010 6:26:32 PM

Spelling correction from my previous reply: Near the end it should say - "...and let it be an autoformer...? Thanks. RBeery
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February 9, 2011 2:23:52 AM

RBeery said:
Thanks for your reply. You are likely right. I'm one who is familiar with electronics without much fear of this kind of project except for the lack of available information. This unit has better features than most otherbrands and models and has worked for years. But it just quit recently. I immediately opened it up to find three facts. The power transformer primary is now open (no continuity on any ohms range). There are four taps on the power transformer secondary. I suppose I could estimate the relative turns ratio s by measuring resistance (assuming the secondary is one continuous winding of the same guage wire). Thirdly when I opened it up almost immediately there was still about 14V DC from the winding to ground (coming back from the filter capacitors, I assume). It didn't go down very fast while measuring it so the caps still carried a healthy charge. That surprised me since I would expect the rectifiers to blocked any voltage from showing up on the transformer. I didn't try measuring across the filter caps. Perhape a diode shorted and the primary gave way instead of the secondary. (I didn't see a fuse anywhere.) More daunting yet is the fact that the secondary had four taps with a 4 conductor flat cable going to the circuit board. Too many variables! I even thought of trying to feed perhaps 12 V AC from another transformer across the secondary and let it be ab autoformet to create the other voltages needed. But I don't want to guess wrong and burn up the circuit board. So I am thinking what options I have - including watching for one on eBay. This model doesn't show up very often.

Again Thanks for your reply. Let me know if you have any other ideas I might try. RWB

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February 9, 2011 6:50:43 PM

i would ask around to know if anybody else has the same product.
then they could give you the parameters you need to buy a replacement that meets the same characteristics.

you need voltage output level
perhaps the frequency of the output
perhaps the impedance of the transformer
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April 3, 2011 1:01:42 AM

RBeery said:
Spelling correction from my previous reply: Near the end it should say - "...and let it be an autoformer...? Thanks. RBeery



If you give up on the equalizer, I would be interested in purchasing the analyzer microphone that goes with the unit.
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April 13, 2011 11:55:41 PM

DoubleJ said:
If you give up on the equalizer, I would be interested in purchasing the analyzer microphone that goes with the unit.


Thanks for your interest in the BSR microphone but I also use it with other equipment so I don't plan to sell it. Thanks. Ron
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January 21, 2012 5:34:42 PM

RBeery said:
Thanks for your interest in the BSR microphone but I also use it with other equipment so I don't plan to sell it. Thanks. Ron

hello, What does the mic look like. Does it use a battery in the mic or pick up phantom power from the unit. One of the outputs from the power supply could hve been what powers the mic. I would suggest finding a eq from BSR even another model as most shared components like that. I have bone it many times on DBX stuff. Let me know about the mic, Roger
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September 5, 2012 6:45:07 PM

RBeery said:
Thanks for your reply. You are likely right. I'm one who is familiar with electronics without much fear of this kind of project except for the lack of available information. This unit has better features than most otherbrands and models and has worked for years. But it just quit recently. I immediately opened it up to find three facts. The power transformer primary is now open (no continuity on any ohms range). There are four taps on the power transformer secondary. I suppose I could estimate the relative turns ratio s by measuring resistance (assuming the secondary is one continuous winding of the same guage wire). Thirdly when I opened it up almost immediately there was still about 14V DC from the winding to ground (coming back from the filter capacitors, I assume). It didn't go down very fast while measuring it so the caps still carried a healthy charge. That surprised me since I would expect the rectifiers to blocked any voltage from showing up on the transformer. I didn't try measuring across the filter caps. Perhape a diode shorted and the primary gave way instead of the secondary. (I didn't see a fuse anywhere.) More daunting yet is the fact that the secondary had four taps with a 4 conductor flat cable going to the circuit board. Too many variables! I even thought of trying to feed perhaps 12 V AC from another transformer across the secondary and let it be ab autoformet to create the other voltages needed. But I don't want to guess wrong and burn up the circuit board. So I am thinking what options I have - including watching for one on eBay. This model doesn't show up very often.

Again Thanks for your reply. Let me know if you have any other ideas I might try. RWB



Did you ever resolve your issue? I have a similar unit with another problem. My unit had a 6.00Mhz crystal completely corroded in its place that should be an easy repair, however there was a 4.000Mhz crystal floating around within the box. I do not know where it goes. Do you know if this unit has 2 crystals?
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January 13, 2013 11:35:24 AM

The 4.00 MHz crystal goes under the spectrum analyzer display in the front. You will need to pull the front board out to get at it. I just replaced mine and found the replacement crystal on DigiKey.
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February 7, 2013 8:50:48 PM

RBeery said:
I need a power transformer for my BSR EQ 14/14XR equalizer-spectrum analyzer. The primary winding has failed (It's dead - primary winding shows open circuit). Please, help me find a proper replacement transformer? RBeery@i2k.com


I'm not sure if you're still looking but I'm about to dispose of my BSR 14/14XR which has been behaving a little strangely. I could ship it to you at cost (with manual and remote) if you're interested. Robin robin@marcate.com SF Bay Area
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