Edcor Wrong Transformer...

[jonnykun]

I recently bought the XPWR233-100 from Edcor, and asked to change the mains voltage design from default 100V to 120V. They agreed to do this free of charge. So I receive the transformer and begin to build my amp.

When testing the secondary voltages, they were ALL way too high! The 6.3V winding was at 7.7V loaded, and the b+ was at 610V before the 5AR4 and 550V after rectification. Is this just me or is this way too high?

Something tells me they just packaged a 100V model and sent that one to me. I measured the mains voltage in my house and it was a solid 120.1V.

 

[TonyTecson]

what was your actual line voltage at the socket outlets?

suggest you give Edcor the feedback....nothing much we can do for you here...

 

[jonnykun]

Yeah I sent them an email already.

The line voltage at the socket I measured to be 120.1V, so it's pretty bang on...

 

[TonyTecson]

in Manila, our utility is supposed to be 220v but most of the time it is at 230v and even going up to 240volts...

 

[LinuksGuru]

I recently bought the XPWR233-100 from Edcor, and asked to change the mains voltage design from default 100V to 120V. They agreed to do this free of charge. So I receive the transformer and begin to build my amp.

When testing the secondary voltages, they were ALL way too high! The 6.3V winding was at 7.7V loaded, and the b+ was at 610V before the 5AR4 and 550V after rectification. Is this just me or is this way too high?

Something tells me they just packaged a 100V model and sent that one to me. I measured the mains voltage in my house and it was a solid 120.1V.

Have you loaded the transformer? If your secondaries are unloaded (nothing after rectifier), voltage will be higher for sure.

 

[Tesla88]

Have you loaded the transformer?

The 6.3V winding was at 7.7V loaded

 

[zelgall]

Is there a reason you didn't order the XPWR233-120? It's the same trans with a 120V primary for us folks in Canada.
Edcor actually list a number of transformers which are of similar voltages.

 

[LinuksGuru]

You have to ask for replacement, transformer you got seem to have 100V primary.

Additionally, you can wind missing primary turns if there is still room on bobbin, but this is awkward way to say at least.

 

[jonnykun]

Yes, I contacted Edcor today and I must say their response was unexpected..they offered to ship me the 120V version as a replacement. Great service! Now the next challenge is to take out and rewire the power supply again...

 

[kevinkr]

Sounds like all's well that ends well.

Edcor has provided me with nicely made custom transformers for a significant number of my personal designs, they run cool and quiet and easily meet their specs. Easy to recommend.