Hello guys, I’m desperate to find an original power supply for this amp. It was handed down to me and I listened to it all the time but my partner threw out the power supply by mistake thinking it was for the keyboard we were getting rid of!!! 😡
If they are pure unobtainium would anyone happen to have a circuit diagram or know how to make one?? I have done a little research and there isn’t much online wrt the power supply. What I did find is what it needs a 19v+/- ac supply.
Any help would be much appreciated.
Matt
If they are pure unobtainium would anyone happen to have a circuit diagram or know how to make one?? I have done a little research and there isn’t much online wrt the power supply. What I did find is what it needs a 19v+/- ac supply.
Any help would be much appreciated.
Matt
Hi Matt,
do you have the Brocksieper Earmax made in Germany? This one used a custom wallwart with a Lemo connector ($$) and unspecified output voltage.
The original circuit with 6922 tubes was running with a B+ supply of 220V DC, so I wonder how the circuit should work with a 19V transformer.
I quickly searched and found a chinese schematic showing the low voltage supply, but it doesn't make sense to me.
When the opriginal wallwart was tossed out it will not be easy to find a replacement... you need to find the specs of the original supply first.
My self-drawn schematic how I built the Morgan Jones OTL (=Earmax) is still on the internet. 😉
do you have the Brocksieper Earmax made in Germany? This one used a custom wallwart with a Lemo connector ($$) and unspecified output voltage.
The original circuit with 6922 tubes was running with a B+ supply of 220V DC, so I wonder how the circuit should work with a 19V transformer.
I quickly searched and found a chinese schematic showing the low voltage supply, but it doesn't make sense to me.
When the opriginal wallwart was tossed out it will not be easy to find a replacement... you need to find the specs of the original supply first.
My self-drawn schematic how I built the Morgan Jones OTL (=Earmax) is still on the internet. 😉
Would an 18vac wall wart work?
https://uk.farnell.com/ideal-power/77db-10-18m/adaptor-uk-18v-0-56a-multi-plg/dp/2112020
Some interesting info here: The Morgan Jones Mini Tube Headphone Amplifier. – HeadWize Memorial
https://uk.farnell.com/ideal-power/77db-10-18m/adaptor-uk-18v-0-56a-multi-plg/dp/2112020
Some interesting info here: The Morgan Jones Mini Tube Headphone Amplifier. – HeadWize Memorial