I'm refurbishing some Quad ESL 57s and want to renew the 150K 180K and 270K resistors in the audio transformers. I haven't found any specification for the wattage or voltage. I know it must be somewhere....
Can anyone put me right?
Thanks
Can anyone put me right?
Thanks
Looking at an early circuit diagram the values you show conform to that age of speaker .
If they are not ceramic covered then they are the old Erie type 8 carbon resistors --changes were made in relation to whether it was the Quad 303 being used or the later Quad 405 .
I have had a Quad 303 and have the original Quad 303 power amplifier schematic as sent by Quad themselves ( up to serial number 11500 ).
Amendment --- it seems Quad also had the Erie type 8 made with a ceramic covering in a slightly later amendment.
If they are not ceramic covered then they are the old Erie type 8 carbon resistors --changes were made in relation to whether it was the Quad 303 being used or the later Quad 405 .
I have had a Quad 303 and have the original Quad 303 power amplifier schematic as sent by Quad themselves ( up to serial number 11500 ).
Amendment --- it seems Quad also had the Erie type 8 made with a ceramic covering in a slightly later amendment.
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Hi, These are the PSU boards. I've done them and its worked a treat. The audio transformers take the amp output and boost it to the voltages required for the stators. My guess is that they need similar specs to the PSU ones, but I don't want to make any silly mistakes. I'm a newbie rediscovering skills I last used about forty years ago.
I am a Quad ESL 57 Owner of over 20 Years, but leave the EE Stuff to those better qualified than myself.
I am a wire a Plug Properly type of EE.
The Link will be very useful for your revival of EE Activities on the 57's.
ESL 57 world – Digging into details
I am a wire a Plug Properly type of EE.
The Link will be very useful for your revival of EE Activities on the 57's.
ESL 57 world – Digging into details