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Old 19th July 2010, 02:46 AM   #501
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The offset and bias will drift with warm up or even when you put on the chassis cover; it's best to readjust it over a period of time.
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Old 19th July 2010, 04:13 AM   #502
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Both channels .59 and 0-2 mv offset.

Thanks guys!

Russellc
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Old 23rd July 2010, 01:12 PM   #503
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Ran it untill stable, powered down, hooked up B-1 and speakers power up, and it makes music. Thank to everyone and especially Peter.

Russellc
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Old 23rd July 2010, 01:15 PM   #504
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Peter, what is the status of the F-5 boards? If there are any, I'll be needing a pair in a couple of weeks. I remember you saying something about getting low. Any plans to order more?

Russellc
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Old 23rd July 2010, 01:17 PM   #505
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Yes, its working, I'm down to 5 Mv, I think I can 0 it out. I wouldnt have expected the circuit to work like that, but I turn one up and the other down, the Mv on the output goes down and the two resistors measurements are the same, but low. Now to bias it up. Thanks for the time to school me here, much appreciated. I can pay now if its getting to the end. Are the power supply boards still plentiful? I know they are not specifically for the F-5, so I assume you'll be kepping these around?

Thanks for info,

Russellc
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Old 24th July 2010, 01:48 PM   #506
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Sorry, I quoted the wrong post above, how do I delete?

Russellc
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Old 24th July 2010, 03:20 PM   #507
brickj is offline brickj  United Kingdom
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Peter,
F5 & PSU boards arrived last week - excellent quality.
Thanks!
Justin.
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Old 29th July 2010, 11:49 AM   #508
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Say can you guys give me an idea about what is "normal" in terms of drift in the offset and bias of the F-5? Mine's just breaking in and if I set it at .59 and 0 mv and let it play for a few hours and remeasure, it seems to go up to about 15mv-(at first 25 mv) and bias at .61. Heat sinks handle it well, can touch indefinitely. After a long listen last night, it again drifted up to 14-15 mv and .60-.61 offset. I reset to .59 and 0-1 mv and powered down. This morning I turned it back on, let it set for about an hour with no music, and had 5 mv off set and .58-.59 bias. Is this normal?

Thanks for the input,

Russellc
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Old 29th July 2010, 12:34 PM   #509
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I would say that's fine. Probably more so with Thermistors than without.
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Old 29th July 2010, 04:16 PM   #510
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I would say that's fine. Probably more so with Thermistors than without.
But AFAIK, thermistors should keep it more stable, shouldn't they?
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