the_racker_reilly
Member
I saw Sisu MT's post the other day, and thought I'd ask here if anyone can help me figure out a replacement transformer for my Aphex 141? I'm a newbie, so apologies for any dumb questions and my general lack of understanding, and thank you for any patience you feel you can spare to help me!
The only info on the original transformer reads
Both the primary and secondary windings appear to be intact, it's just the thermal cutoff fuse that's gone, so I guess I could just try to replace that fuse.
However, I live in Ireland where we have 230V, so I'd need a step-down transformer to get me to 110V. So maybe it makes more sense to replace the original transformer with a 230V alternative, plus I might learn something along the way!
The two voltage regulators in the circuit are an LM1086 and an LM2991T, which specify max input voltages of +29V and -26V respectively. There are two large electrolytic caps between the bridge rectifier and the regulators that are rated at 35V. (There's also an LM2675 step-down regulator, but I'm not sure that helps us.)
Putting a multimeter across the secondary windings (photo below), I get roughly 7Ω and 7.9Ω between the central blue wire and each of the orange/green wires. I get 15Ω between the orange and green. So center-tapped secondary, if I'm not wrong?
Would I be correct in thinking that all this suggests I should be looking for a 24-0-24 V center-tapped secondary?
There's also the question of the power rating: written the rear of the unit is "AC LINE / 10 Watts" - does that translate to a rating of 10VAC transformer, or is that too simplistic of me?
Thank you for reading this far, and thank you for any help you can offer! (photos below)
The only info on the original transformer reads
and an internet search unfortunately doesn't turn up anything on that. I also emailed Aphex for info, but got a response saying they'd been acquired by Rode Microphones, and "unfortunately, no parts, part numbers or technical data was transferred to us for discontinued models".100 / 120 V
TOPMARK
SEI:380-0300
E2HKWA03
Both the primary and secondary windings appear to be intact, it's just the thermal cutoff fuse that's gone, so I guess I could just try to replace that fuse.
However, I live in Ireland where we have 230V, so I'd need a step-down transformer to get me to 110V. So maybe it makes more sense to replace the original transformer with a 230V alternative, plus I might learn something along the way!
The two voltage regulators in the circuit are an LM1086 and an LM2991T, which specify max input voltages of +29V and -26V respectively. There are two large electrolytic caps between the bridge rectifier and the regulators that are rated at 35V. (There's also an LM2675 step-down regulator, but I'm not sure that helps us.)
Putting a multimeter across the secondary windings (photo below), I get roughly 7Ω and 7.9Ω between the central blue wire and each of the orange/green wires. I get 15Ω between the orange and green. So center-tapped secondary, if I'm not wrong?
Would I be correct in thinking that all this suggests I should be looking for a 24-0-24 V center-tapped secondary?
There's also the question of the power rating: written the rear of the unit is "AC LINE / 10 Watts" - does that translate to a rating of 10VAC transformer, or is that too simplistic of me?
Thank you for reading this far, and thank you for any help you can offer! (photos below)