Perhaps I overpaid, but I just bought a Threshold Model 4000 in what I consider very good condition cosmetically (and the seller claims it was recently serviced) from a Japanese seller, and it's labelled 100V 50/60Hz, with an IEC connector on the back so it will accept a standard power cord. With my limited electrical knowledge, it seems to me the transformer would be different for a Japan model amp, which, in retrospect, makes the purchase not nearly the good idea it seemed late last night after a few drinks. I don't suppose Nelson Pass still participates on this forum? Regardless of what it will take to make it function here, I'm very excited to get one of the amps I've been drooling over for 40 years. Move over Perreaux PMF2150B (which I've loved having all these years). Not terribly relevant, but driving Mirage M1s, a pretty easy speaker to drive (and still sound REALLY GOOD to me). Counterpoint SA1000 preamp recently retubed.
Thanks.
Joe
Thanks.
Joe
Easiest solution is to get an external step down transformer in a housing to power it. What you need is a 120VAC to 100VAC unit rated at 1kva or thereabouts.
I do not know if the mains transformer in the 4000 has mains taps, if so it might be as simple as a primary transformer tap change.
Hardest solution is to get hold of a new transformer with appropriate windings.
You will also be better off asking a Moderator to move this thread to the Pass labs forum - you will get a much better response.
I do not know if the mains transformer in the 4000 has mains taps, if so it might be as simple as a primary transformer tap change.
Hardest solution is to get hold of a new transformer with appropriate windings.
You will also be better off asking a Moderator to move this thread to the Pass labs forum - you will get a much better response.
No idea whether the transformer is multi-tap either.
Chatted with my electronics expert friend for a while as I looked online for step down transformers.
Got a new return 2KW VCT-2000 from Amazon, less than $100 shipped.
Being as the circuit it'll be connected to is 15A, it's overkill, but it was only a few bucks more than a 1KW.
Thanks to all who weighed in.
Joe
Chatted with my electronics expert friend for a while as I looked online for step down transformers.
Got a new return 2KW VCT-2000 from Amazon, less than $100 shipped.
Being as the circuit it'll be connected to is 15A, it's overkill, but it was only a few bucks more than a 1KW.
Thanks to all who weighed in.
Joe
Here is the schematic of the power supply for the Threshold 4000. The transformer is tapped for 100/120 Volts.
Grey wire for 100V, Black for 120V. If your amplifier is the same as this, the conversion should be fairly easy for someone skilled in the art.
Grey wire for 100V, Black for 120V. If your amplifier is the same as this, the conversion should be fairly easy for someone skilled in the art.
There is the other option for you, with the tapped primary. I would be looking to change the power supply electrolytic caps C3 to C6 by the way.
If you have already purchased the ext step down tranny - than just use that.
If you have already purchased the ext step down tranny - than just use that.