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Hello
I hanve one channel of my T X-BOSOZ working but there is really no gain I can turn the volune up all the way it dosen't get very load at all. Also whats the best set fot the volume control input or output?
Regards
Dave
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Hi, I have a JT on the output it sounds much better that way to me. I tested it with a pot on the input and I think I remember I had the same problem. Hope this helps.
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Hello Still having problems with low output gain  I check the FET’s they seem fine. I had to replace a few of them when I first put the preamp together because I installed R1, R2, R6, andR7 wrong I fixed that replaced the FET’s that bring to where I am now. I was reading the original thread on diyaudio.com looking at the PCB layout. So with R1 and R7 in wrong could it be possible that REF 1 went bad also the same with REF 2 causing me to have low output? Regards Dave
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Dave Sans wrote:Hello Still having problems with low output gain I check the FET’s they seem fine. I had to replace a few of them when I first put the preamp together because I installed R1, R2, R6, andR7 wrong I fixed that replaced the FET’s that bring to where I am now. I was reading the original thread on diyaudio.com looking at the PCB layout. So with R1 and R7 in wrong could it be possible that REF 1 went bad also the same with REF 2 causing me to have low output? Regards Dave It is possible, what I would to is check the voltage on the output side of the REFs, it should be 10V. Cheers! Russ
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Hi Russ Help me here I am not an EE would the output side be the pin closest to the FET? And if so is it from that pin to ground I would masure to see if there is 10v Regards Dave Edited by user Thursday, November 9, 2006 9:54:48 AM(UTC)
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Dave Sans wrote:Hi Russ
Help me here I am not an EE would the output side be the pin closest to the FET?
And if so is it from that pin to ground I would masure to see if there is 10v
Regards
Dave Actually I did a terrible job describing it. You should check the positive pin. Which is the center pin. The easiest way would be to check the pins of R10 and R11 which are closest to the FETs. The reference would be between those pins and ground. Cheers! Russ Edited by user Thursday, November 9, 2006 10:08:32 AM(UTC)
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Ok Russ
I check R10 and R11 I didn't get a 10 volt reading the meter was all over the place
Dave
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Dave Sans wrote:Ok Russ
I check R10 and R11 I didn't get a 10 volt reading the meter was all over the place
Dave Which end of R10, and R11 did you check, it should be the end toward the VREF.
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Rank: Member
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Rank: Administration
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Dave Sans wrote:Yes thats the one OK and your reference was GND?
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Yes thats right I went from the resistor side closest to the FET the trace following to the center pin of REF1 I used the chassis as ground. I can recheck it tonight.
Dave
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Dave Sans wrote:Yes thats right I went from the resistor side closest to the FET the trace following to the center pin of REF1 I used the chassis as ground. I can recheck it tonight.
Dave Well then, it sound like you don't have 10V from you VREFs, and that would be bad... Sorry.
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So Ref 1 and 2 would be bad? What about the zeners?I am go to pull it apart this weekend recheck the FETs and so on and see if I can get some where.
Thanks for your help
Dave
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Dave Sans wrote:So Ref 1 and 2 would be bad? What about the zeners?I am go to pull it apart this weekend recheck the FETs and so on and see if I can get some where.
Thanks for your help
Dave I am actually not sure how to check the zeners in place... But yes, it would appear from your discription that the voltage refs are dead.
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Well I am going to check and see if Mouser has them because digikey has that 25 doller min I will pull the zeners off the board and check them also.
Dave
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