Help needed with BZLS

franck_chretien · 12th February 2002, 05:30 PM

Hi All

this is my first post on this forum. I just built the Balanced zen linestage and I can say I am quite pleased with the sound but there is one problem. The soundstage is not very focussed compared to other preamps I owned (AR LS8 for example). I used the BZLS in full balanced mode input and output with a 4 gang 10K ALPS Pot for volume control in input (no P3,P4,P5). I mesured the preamp and I found that the Regulated power supply is delivering +60.5V -58.7V could it be the reason of the problem with the soundstage. otherwise on one board I mesure -4V before the source of the IRF610 and -3,7V on the other board.
between 31,3 and 31,7 on the drain. is it normal ?

Franck

PS: Sorry for my mistakes in english, I am doing better with french

fcel · 12th February 2002, 06:50 PM

Let me take a crack at this ........ it might not be due to the "offset" voltages but you might have wired one of the 4 gang pot in reverse - check the polarity of the 12 wires coming out of the 4 gang pot. Or .... try moving one of the speaker a few inches forward or backward ....since essentially you can't control the balance with the 4 gang pot.

franck_chretien · 13th February 2002, 05:58 AM

I checked that but this is not the problem. This was the first thing I thought. The pot is mounted on a separed board (dedicated to it). I tried it on another preamp (differential of 2sk216) and it was ok. the problem should be somewhere else.

12th February 2002, 05:30 PM	#1
franck_chretien diyAudio Member Join Date: Feb 2002	Help needed with BZLS Hi All this is my first post on this forum. I just built the Balanced zen linestage and I can say I am quite pleased with the sound but there is one problem. The soundstage is not very focussed compared to other preamps I owned (AR LS8 for example). I used the BZLS in full balanced mode input and output with a 4 gang 10K ALPS Pot for volume control in input (no P3,P4,P5). I mesured the preamp and I found that the Regulated power supply is delivering +60.5V -58.7V could it be the reason of the problem with the soundstage. otherwise on one board I mesure -4V before the source of the IRF610 and -3,7V on the other board. between 31,3 and 31,7 on the drain. is it normal ? Franck PS: Sorry for my mistakes in english, I am doing better with french

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12th February 2002, 06:50 PM	#2
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	Let me take a crack at this ........ it might not be due to the "offset" voltages but you might have wired one of the 4 gang pot in reverse - check the polarity of the 12 wires coming out of the 4 gang pot. Or .... try moving one of the speaker a few inches forward or backward ....since essentially you can't control the balance with the 4 gang pot.

13th February 2002, 05:58 AM	#3
franck_chretien diyAudio Member Join Date: Feb 2002	I checked that but this is not the problem. This was the first thing I thought. The pot is mounted on a separed board (dedicated to it). I tried it on another preamp (differential of 2sk216) and it was ok. the problem should be somewhere else.