I have a transformer from an NAD C370. There are no specs/values written on it and I haven't been able to find any on the web. I'd like to use it for another project but have no idea what the VA rating is. Is there a way to measure it?
You know it is from that model, which is a 120w per channel into 8 ohms rated amp. SO I'd wager it could be used for a similar design spec.
Yeah the C370 is rated at 120 watts. I'd like to know if it's safely/comfortably capable of more.
Some general clues here:
https://www.diyaudio.com/community/threads/transformer-identification-need-help.253543/post-3868831
https://www.diyaudio.com/community/threads/transformer-identification-need-help.253543/post-3868831
I'm not messing with input voltage. I'm wondering if it's capable of more than 240VA out. I assume it is because the 120W per channel is for 8R loads. Just trying to figure out the actual figure.
I'd like to use it for the new Wolverine amplifier if possible but if it's going to be marginal for the power output I want then I'll get a different one. Targeting ~750VA.
I'd like to use it for the new Wolverine amplifier if possible but if it's going to be marginal for the power output I want then I'll get a different one. Targeting ~750VA.
750/250 = 3
120*2 = 240, so 250 is easier to work with...
It is way out of its league for 750.
Not gonna work, at least not for long.
Why 750, that is high?
120*2 = 240, so 250 is easier to work with...
It is way out of its league for 750.
Not gonna work, at least not for long.
Why 750, that is high?
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As I previously commented, use the transformer for an amp of 100/100 watts, because this can result in a decent conservative rating, insuring longevity of the transformer, and good performance of the amp.
If you insist on pushing it to its limits, then it's on you.
Bob Cordell suggests you get five or ten datasheets from the most similar transformers you can find.
Make a two column spreadsheet where column B is the VA rating and column C is the WEIGHT (in kg or lbs) of those transformers, according to their datasheets.
Have Excel create a "trendline" (EEs call this a Linear Regression) of the data, and overlay the equation upon the plot.
Now that you have an equation, plug in the weight of your unknown transformer. Presto! You get the (predicted) VA rating.
Jolly good. Well done. Congratulations.
Make a two column spreadsheet where column B is the VA rating and column C is the WEIGHT (in kg or lbs) of those transformers, according to their datasheets.
Have Excel create a "trendline" (EEs call this a Linear Regression) of the data, and overlay the equation upon the plot.
Now that you have an equation, plug in the weight of your unknown transformer. Presto! You get the (predicted) VA rating.
Jolly good. Well done. Congratulations.