Hi everyone.
I have been piecing together a pair of monoblocks using 2 se boards. I finally had them comlpeted enough to start the checkout and biasing procedures. I followed the advice on another thread about doubling r3 an r6 and did that, otherwise all parts are derived from the parts list. I'm using the Edcor xpwr131 transformers and Transcendar 10w 5K outputs, using the c14 chokes. My b+ is a bit too high at around 450v, b- is at -277. I have 47uf caps for c4 but I have 15uf motor run caps that I was going to use when the clamps come in the mail. That will drop it a little.
Another problem I have is that the voltage on both of the 5842's will not rise above 155 and 150. I added a 1k to r17 to bring that down to 500ohms but that only raised it to 165. I can't wrap my head around the b+ being that high but then the 5842 plates being that low, unless there is some kind of interaction between components when both channels are in use. It seems to me that everything should be higher if anything.
Can anyone suggest other areas of the circuit that I should address for this issue? I'm almost thinking that I could live with that, but I have to bring the b+ down and I thought raising the plate voltage on the 5842's up to 175 will help in that regard.
Any advice is greatly appreciated.
Thanks,
Wianieq
I have been piecing together a pair of monoblocks using 2 se boards. I finally had them comlpeted enough to start the checkout and biasing procedures. I followed the advice on another thread about doubling r3 an r6 and did that, otherwise all parts are derived from the parts list. I'm using the Edcor xpwr131 transformers and Transcendar 10w 5K outputs, using the c14 chokes. My b+ is a bit too high at around 450v, b- is at -277. I have 47uf caps for c4 but I have 15uf motor run caps that I was going to use when the clamps come in the mail. That will drop it a little.
Another problem I have is that the voltage on both of the 5842's will not rise above 155 and 150. I added a 1k to r17 to bring that down to 500ohms but that only raised it to 165. I can't wrap my head around the b+ being that high but then the 5842 plates being that low, unless there is some kind of interaction between components when both channels are in use. It seems to me that everything should be higher if anything.
Can anyone suggest other areas of the circuit that I should address for this issue? I'm almost thinking that I could live with that, but I have to bring the b+ down and I thought raising the plate voltage on the 5842's up to 175 will help in that regard.
Any advice is greatly appreciated.
Thanks,
Wianieq
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