Bias adjustment on Dynaco ST70

ghisdal · 12th March 2007, 07:47 PM

Hi,

Where do I measure the BIAS of this amplifier? The original manual is unclear on this point....

Where does the mulitmeter go?

tangen · 12th March 2007, 08:05 PM

You have two connectors in the front? Each have a hole that is marked "Biaset 1,56 V". Set your multimeter on 2 V. Put the read pin from the multimeter in the hole mentioned and the black pin on the chassis. Take the left side first. Use a screwdriver on the potmeter on the top of the chassis between the valves. Adjust the left potmeter til you read 1,56 V on the mulitmeter. Then move the red pin to the right connector/hole, and repeat the above. I a adjust to only 1,4 V (longer life on the valves, and the amplifier plays better, in mye opinion).

You can phone me, I am a norwegian +47 916 26 170

best wishes
jan ove

12th March 2007, 07:47 PM	#1
ghisdal diyAudio Member Join Date: Nov 2006	Bias adjustment on Dynaco ST70 Hi, Where do I measure the BIAS of this amplifier? The original manual is unclear on this point.... Where does the mulitmeter go?

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12th March 2007, 08:05 PM	#2
tangen diyAudio Member Join Date: Jun 2005 Location: Boe i Telemark, Norway	You have two connectors in the front? Each have a hole that is marked "Biaset 1,56 V". Set your multimeter on 2 V. Put the read pin from the multimeter in the hole mentioned and the black pin on the chassis. Take the left side first. Use a screwdriver on the potmeter on the top of the chassis between the valves. Adjust the left potmeter til you read 1,56 V on the mulitmeter. Then move the red pin to the right connector/hole, and repeat the above. I a adjust to only 1,4 V (longer life on the valves, and the amplifier plays better, in mye opinion). You can phone me, I am a norwegian +47 916 26 170 best wishes jan ove

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