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In Reply to: RE: Seth PT transformer posted by fiftyfivefilms on January 18, 2015 at 14:54:08
Thanks for the relies,
Yes I have used Heybeor before, they did a replacement tranny for my Scott LK-48, and I was really satisfied with their work.
my confusion here was the specs on the Hammond 374BX 375V-0-375 V 175 mA suggested by Jeff on the Seth build PDF, I did some research on the the Hammond 374BX and it's spec sheet states current is 201mA, I realize a little more current wouldn't hurt but is 175 ma enough for a Seth build.
It's possible there is a typo in Jeffs PDF regarding that model number? maybe Hammond changed their model numbers ect...
so all I really wanted to know is 175mA enough for a Seth
Cheers,
Kirk
Follow Ups:
Hammond has ben revising and expanding their data sheets lately, and some are more clear than others about whether the high voltage current rating is RMS or "DC current with a cap input filter". This one is not clear about it, but that may well be the difference.
Looking at the schematic it looks like the Seth amp Uses about 170 ma.
Michael
If it uses 170MA then that doesn't leave much to spare. The power supply could sag.
The primary on the 5504 is 115vrms @ 60 hzThe primary on the 5500 is 115vrms @ 60 hz or 230vrms @ 50hz.
Secondary voltages and currents are as follows and the same
for either the 5500 or the 5504.720 VCT @ 100ma rms (please note this is an rms value for the current)
5 volts @ 2 Arms
6.3 VCT @ .5 Arms
2.5 V @ 1.25 Arms
2.5 V @ 1.25 Arms
and has a lead out for the electrostatic sheild
The two 2.5 volt windings can be put into parallel or series
for the following;5 VCT @ 1.25 Arms if connected in series
2.5 volts @ 2.5 Arms if connected in parallel
This unit is run very conservatively with the flux density
well below 10kg (5504)and below 12kg (5500). It was designed
for a very low temperature rise and never gets HOT if run within specs.Anyone is free to share this data with any manufacturer of their own choosing and to have products made to this published electrical spec. But please assign it a new part number and do not call it a 5500 or 5504 or use our prefix (MQR). And of course we do not warranty or guarntee the construction, suitability, or performance of any product not produced by MagneQuest.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Edits: 01/21/15
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