[martyn_mcg]

Thank you for the replies,

I purchased one of the little signal generators and hope to give it a go soon, i will test the amplifier as it is and see if the voltages i get are close to the specification in the service manual to prove it out before i swap out the old presets just to be sure it works as i hope.

Thanks again,

Martyn

[martyn_mcg]

Thanks for getting back to me.

There are some very cheap signal generators available on eBay and amazon and the amplitude of the sine wave is adjustable but is not displayed on the unit. they are called an FG-100 DDS and are available for about £20.

In theory i should be able to adjust the amplitude and set it using the RMS function on my multi-meter and this should be sufficient to perform the calibration of the volume, tone and bass as per the service manual? i know its probably very crude but given my lack of better equipment it would be better than nothing?

does this sound plausible?

Thanks again for your help,

Martyn

[martyn_mcg]

are you able to confirm that the voltage reading for amplitude in the B&O service manuals is in fact in RMS?

the manuals don’t actually specify and i am assuming that is because all their technicians at the time had the same equipment….

Thanks

Martyn

[martyn_mcg]

Thank you for your help, i will look in to which capacitors i need for the signal path and try and source those WIMA replacments.

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