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SE Output xfmrs....who are the current suppliers for not many $$$
SE Output xfmrs....who are the current suppliers for not many $$$
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Old Yesterday, 02:57 AM   #61
Tubelab_com is offline Tubelab_com  United States
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Quote:
In stead I ordered one OT at a time
Yeah, I thought of that as soon as I got the invoice with $32 shipping. They are now in the hands of UPS, but still in Poland. Still, a pair of SE OPT's that do 30 to 50 watts each for $208 shipped is a deal...if they work out.

I'm not in a big hurry anyway since I seem to be the IT guy for the extended family...everyone wants their free Windows 10 upgrade before it goes away.

Depending on how the transformers work out, I'll remember the "order one at a time" trick next time.
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Old Yesterday, 04:23 PM   #62
Francois G is offline Francois G  United States
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Quote:
Originally Posted by Tubelab_com View Post
....a pair of SE OPT's that do 30 to 50 watts each for $208 shipped is a deal...if they work out.

Depending on how the transformers work out......
I am looking forward to your findings after you put the Toroidy SE OTs through you tests. Iím hoping there is a TSEII in my future.
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Old Yesterday, 04:32 PM   #63
gerrittube is offline gerrittube
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Off topic, but curious: I haven’t seen a Windows 10 upgrade over here in The Netherlands. Does MS offer that?

Regards, Gerrit
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Old Yesterday, 08:56 PM   #64
opcom is offline opcom  United States
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Edcor has been very useful to me. I needed to find a way to drive a variable impedance load without having the transformer cause issues. It was not an issue.. but I needed calling their tech support, and talked to Brian there. Here are some facts on the Edcor audio transformers, and it applies also to the speaker-to-line matching ones which go up to 600W.

Their stated frequency response is the +/-1dB power bandwidth, not some lowest-power marketing rating.

40-20,000Hz +/-1dB for the 100, 200, and 400W, 140V-line-to-speaker units I bought.

M6 steel used, 29 gauge laminations (0.0135 inch, 0.34 mm), (Grain) line oriented

Virgin copper wire (no recycled copper). Essex is the main source manufacturer of wire. Chinese wire is very often recycled and impure -so not used.

glass filled nylon bobbins

interleaved windings on all audio products.

Edcor used to make amplifiers, and at first was buying the OPTs from another company, but then they started making them in-house with quite higher quality than the usual "PA" amp transformer and people were buying the amps more frequently because of the sound quality. OK well solid state public address and hi-fi amps became dime a dozen from China, so Edcor focuses only on making high quality transformers. I think it's the best for the $.
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Old Yesterday, 09:21 PM   #65
6A3sUMMER is offline 6A3sUMMER  United States
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Many transformer manufacturers rate the high and low frequencies at -3 dB.
Many amplifier manufacturers do the same.

Some rate +/- 1 dB. That is better than - 3 dB.

Since most good transformers, and most good amplifiers, have smooth frequency response curves, that means that +/- 1 dB is the same as +0 dB / -2 dB.
(0 dB at midband)
That is because if you have any ripple in the frequency response curve at or near midband, then that product is not good.

It is a marketing thing:
+/- 1 dB sounds better than +0 dB / - 2 dB, but most of the time they are equal and the same thing.
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Old Yesterday, 10:22 PM   #66
opcom is offline opcom  United States
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Oh, SE stuff, oh well sorry about that. I only do PP here. duh.

but the same specs, pretty good. The OPTs do 20Hz..
Wattage 25W
Max. Current 200mA
Primary (input) Impedance 3K Ohms
Primary (input) DCR 70 Ohms
Primary (input) Inductance 41H
Screen/Grid Tap 40%
Secondary (output) Impedance Depends on model.
Secondary (output) DCR <1 Ohm
Frequency Response 20~20K Hz., <1dBu
$<100

just the line units I bought do 40.
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