Pass X250.5 Voltage Change Confusion - Page 2 - diyAudio
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Old 13th June 2009, 07:51 PM   #11
vuki is offline vuki  Croatia
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So, that was some "in between" version? Because; in the first version transformers had multiple tapped dual primaries (110, 115...240V), the version "in between" had same dual primaries but tapped as single with connections hidden beneath isolation tape. And the third version is pure single primary?
Correct?
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Old 13th June 2009, 09:43 PM   #12
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I don't know how there would be such a beast as you describe. There
were transformers that could be tapped for 100,120,200,220, and 240.

The current transformers have taps for 6 voltages, but the range does
not extend from the 100's to the 200's. It requires a separate transformer.

There was no "transitional" transformer in our records.

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Old 14th June 2009, 06:53 AM   #13
vuki is offline vuki  Croatia
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Well, either what you see in the picture was some nonexisting plitron transformer or maybe they didn't give you correct information.
Whole plitrons production is based on multiple primaries transformers, and I bet they wound their transformer primaries all the same, and then according to demand of production tapping them and wound secondaries.
For large power toroids one needs large diameter wire to get single 110V primary and it's hard to wind it and get proper tension with it, so manufacturers usually use parallel thinner wires.
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Old 16th June 2009, 04:30 PM   #14
martev is offline martev  Bulgaria
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Vuki, please send me more pictures for changing voltage. I also think to buy Pass x250 from USA. Thank you!
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Old 16th June 2009, 06:34 PM   #15
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An X250 is probably not a problem because it uses an older
transformer. A recent X250.5 should not be convertible in this way.

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Old 16th June 2009, 06:40 PM   #16
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BTW, I noticed that the photo showed an older amplifier, back when
the transformers were easily converted. You should not have had to
dig into the windings to get to that tap because they were external
and easily accessed. Are you certain that the transformer was
original to Pass Labs?

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Old 16th June 2009, 08:43 PM   #17
vuki is offline vuki  Croatia
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No, the transformer was Ei-Nis ; of course the transformer was original. The amplifier was bought at audiogon and the owner asked Pass Labs if the transformer could be switched to EU voltage (he supplied S/N). The answer was NO. Anyway, the amp was bought with the risk of eventual new transformer buy, but it wasn't necessary
It wasn't easily converted - it had only primary taps - you can see cut off wires in the picture.
It is 250.5 amplifier.
If you don't believe me, how about cutting through isolation of one of your transformers... than you would be sure and you could call Plitron and have refund or call me a liar.
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Old 17th June 2009, 12:04 AM   #18
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Quote:
Originally posted by vuki
If you don't believe me, how about cutting through isolation of one of your transformers... than you would be sure and you could call Plitron and have refund or call me a liar.
I have no reason to do either.

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Old 17th June 2009, 08:19 PM   #19
vuki is offline vuki  Croatia
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Anyway... what was the reason for switching to single primary transformers?
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Old 17th June 2009, 11:22 PM   #20
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Our current primary system has four wires, and we don't desire to have
eight.

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