Hello,
I have completed refurbishing a pair of ESL57, which means all panels except one: a treble panel, which appeared to be good and besides already refurbished (don't know when).
This treble panel makes some background noise, some kind of hum. If un-connected from power supply, this noise disappears. But output power reduces significantly almost immediately and more and more as time passes (timescale in seconds). I changed power supply (the full EHT block) but no improvement.
On the treble panel I refurbished, this is not the case: no hum and even after removing power supply connection, output power still stays high for a long time.
Any idea ? I have one but I would like to get confirmation.
I tried this: add a layer of insulating tape on the outside of the stators (I had to remove the dust cover for this). But I did not test yet if it improves behaviour.
Thank you.
I have completed refurbishing a pair of ESL57, which means all panels except one: a treble panel, which appeared to be good and besides already refurbished (don't know when).
This treble panel makes some background noise, some kind of hum. If un-connected from power supply, this noise disappears. But output power reduces significantly almost immediately and more and more as time passes (timescale in seconds). I changed power supply (the full EHT block) but no improvement.
On the treble panel I refurbished, this is not the case: no hum and even after removing power supply connection, output power still stays high for a long time.
Any idea ? I have one but I would like to get confirmation.
I tried this: add a layer of insulating tape on the outside of the stators (I had to remove the dust cover for this). But I did not test yet if it improves behaviour.
Thank you.