[sdiy] 904A adjustments

[Keith Winstanley]

Hi All,

have been making a few adjustments to my filter;
I never managed to get the filter to balance,
the service manual states that the voltages at R35 & R39
should be about 1.0V and R40 is adjusted to give
approx the same voltage at R35 & R39.

Now on my module with R40 fully counter clockwise
the closest I can get is R35 = 0.365V and R39 = 1.468V
I have checked all the components and wireing.

Has anyone else tried this? What do you get?
The filter sounds great but things like this bug me until
someone tell me its nothing to worry about.
The transistors are all matched to 0.001V of each
other so I suppose I needn't worry?

TIA

regards

Keith

http://home.freeuk.net/lowpass