Hi Guys,
Need help on figuring out a way to use the Sony Stereo receiver which was originaly ment for 120vac in a country where we have 220vac supply.
i asked a local transformer manufacturer and he suggested to use an Auto Transformer which has one winding.
would 50hz supply the existing transformer which is made from 60Hz and at which type of situation would the original transformer be damaged
Re winding is out of question.
all help is welcomed.
Need help on figuring out a way to use the Sony Stereo receiver which was originaly ment for 120vac in a country where we have 220vac supply.
i asked a local transformer manufacturer and he suggested to use an Auto Transformer which has one winding.
would 50hz supply the existing transformer which is made from 60Hz and at which type of situation would the original transformer be damaged
Re winding is out of question.
all help is welcomed.
Transformers rated for 50 Hz can be used at 60 Hz, but not the reverse without derating.
Sometimes a transformer has multiple primary windings or taps, and can be reconfigured for a different AC line voltage.
Otherwise a Variac, or a 2:1 step down transformer of adequate power rating can be used.
Sometimes a transformer has multiple primary windings or taps, and can be reconfigured for a different AC line voltage.
Otherwise a Variac, or a 2:1 step down transformer of adequate power rating can be used.
I see the sony's 220vac transformer is quite expensive, more than that stereo receiver itself. Part # 1-697-120-31 POWER TRANSFORMER (AEP, UK)
I checked the service manual and the transformer it self but i do not see multiple primary taps. there are just 2 taps which are connected to the power cord.
I did not quite understand your last point.
My other concern is heating of the core as the transformer is for 60Hz and I am using it in 50Hz supply.
I have been using one of these with an Aragon 4004 for 4 years. No problems.
https://www.amazon.com.au/Transform...ries-Ultra-Portable-Lightweight/dp/B07KR2TCYH
ray
https://www.amazon.com.au/Transform...ries-Ultra-Portable-Lightweight/dp/B07KR2TCYH
ray
I am living in a country with 220V/127V 50Hz. Using USA equipment 110V 60Hz always has been a problem as people think 127V 50 is "close enough". It is not.
Best solution is an auto transformer and using the 100V output. This derates the output power of the amplifier but a perfect solution does not exist. Except for replacing the device transformer for a 220V 50Hz type.
Older (pre-1980) audio equipment like receivers can take some abuse. Most of them worked reliably with this solution in a very hot climate.
Best solution is an auto transformer and using the 100V output. This derates the output power of the amplifier but a perfect solution does not exist. Except for replacing the device transformer for a 220V 50Hz type.
Older (pre-1980) audio equipment like receivers can take some abuse. Most of them worked reliably with this solution in a very hot climate.
Used STR-DH130 are available starting at 25 EUR (in working condition) here in Germany, so maybe that price point is something to consider when paying top dollar for a transformer. Might be cheaper to dump it and buy a 220V one...
Unfortunately, it's either an internal transformer swap (due to multiple voltages output) or external stepdown/auto-transformer.
Unfortunately, it's either an internal transformer swap (due to multiple voltages output) or external stepdown/auto-transformer.
Would autotransformer 240 to 120 output do as the amp mentions 120Volts at the back.
It also says 60 Hz doesn't it.
Since you have 220V mains the auto transformer would output 110V. You can try it. The transformer in the receiver will not immediately burn out. Try and monitor the temperature. If it is too hot to hold your hands on for half a minute it is not good.
feeding the 120V input with 110V helps , but the 220vac line voltage nowadays is 230V and on sunny days in rural areas with a lot of PV much higher than 230
The power transformer of the receiver should have been designed for continues sine wave power. With program material, running a 120V~/60Hz unit on 110V~/50Hz via an auto transformer is unlikely going to create issues. Maximum power running this way is already recuded by a factor of (120/110)^2 = around 20 %.
When I sticky ear to the amp I can hear a slight hum but do not feel it on hand.
Powered the us unit with a step down 240 to 120 /50Hz
Powered the us unit with a step down 240 to 120 /50Hz
Alternate is to get a transformer made for 220 / secondary volts of the original 110V Sony reciever, which will be around 12V for the reciever section and another for the power amp side, if it has built in amp.
Check with the the service manual if it is available.
1 to 2 Volts deviation on low voltage side is acceptable, if you get a ready transforner. Just swap it out.
The US market units usually do not have multiple primary windings, which were common in units intended for Asia Pacific markets, there were taps and switches for using 120 / 220 V supplies.
And don't worry about 60 Hz, just check if transformer gets hot, in which case the winding for 60 Hz is not happy getting 50 Hz...means get a new transformer made, and change it out inside the reciever.
I feel that the step down transformer should be quite adequate for this task.
Check with the the service manual if it is available.
1 to 2 Volts deviation on low voltage side is acceptable, if you get a ready transforner. Just swap it out.
The US market units usually do not have multiple primary windings, which were common in units intended for Asia Pacific markets, there were taps and switches for using 120 / 220 V supplies.
And don't worry about 60 Hz, just check if transformer gets hot, in which case the winding for 60 Hz is not happy getting 50 Hz...means get a new transformer made, and change it out inside the reciever.
I feel that the step down transformer should be quite adequate for this task.
