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Old Yesterday, 06:18 PM   #1
ChetJettison is offline ChetJettison  United States
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Default I've narrowed down my OT options: which to pick?

I've been looking around for Output Transformer options, and there's not a lot in my price range that's currently available anywhere.
From what I've read, I can expect good sound from Edcor. I was trying to avoid them at first, due to the 10-12 week lead time on new orders. But I'm thinking that it might be worth the wait.
So I've narrowed it down, I believe, to two options.
Help me decide between the two:

First, the option my pocketbook likes best: GXSE10-5K
For less than $100, I'd get my amp up and running.

Second, the "high-end" choice. CXSE25-5K
After reading about these on George's site, I get the impression they will deliver lots of power and bass, without compromising the high frequencies. I dig all that. But is it worth the extra dough? Should I shell out $200+ for these big boys?

I'm also open to other options if anyone has other suggestions.
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Old Yesterday, 11:19 PM   #2
brl0301 is offline brl0301
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You'll usually see it suggested to spring for the nicer opt. It has a big effect on the sound of the amp and should be a one time expense. It really comes down to how much you are looking to spend on the project and how much $100 is to you.

That being said, i have been listening to a spud amp that uses some relatively small/inexpensive opt and it sounds amazing for what it is.

If it were me, Id spend the extra hundred dollars and not wonder how much better it could have been.
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Old Today, 12:36 AM   #3
Tubelab_com is offline Tubelab_com  United States
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It also depends on the capability of your speakers and your preferences in music.

Want to crank some techno, Pink Floyd, or other bass heavy music through speakers with a 15 inch woofer (my Silver Iris drivers mounted in 1941 vintage console radios), go for the big OPT's.

Want to listen to the "girl with a guitar" through speakers that have no response below 80 Hz (my Yamaha NS-10's), or use an active subwoofer for bass, pick the mid-range OPT.
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Old Today, 01:19 AM   #4
ChetJettison is offline ChetJettison  United States
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Quote:
Originally Posted by brl0301 View Post
You'll usually see it suggested to spring for the nicer opt. It has a big effect on the sound of the amp and should be a one time expense. It really comes down to how much you are looking to spend on the project and how much $100 is to you.

That being said, i have been listening to a spud amp that uses some relatively small/inexpensive opt and it sounds amazing for what it is.

If it were me, Id spend the extra hundred dollars and not wonder how much better it could have been.
I like this philosophy. I think youíve tilted the scale for me, friend.

Quote:
Originally Posted by Tubelab_com View Post
It also depends on the capability of your speakers and your preferences in music.

Want to crank some techno, Pink Floyd, or other bass heavy music through speakers with a 15 inch woofer (my Silver Iris drivers mounted in 1941 vintage console radios), go for the big OPT's.

Want to listen to the "girl with a guitar" through speakers that have no response below 80 Hz (my Yamaha NS-10's), or use an active subwoofer for bass, pick the mid-range OPT.
I enjoy a very wide range of music, and I do appreciate good low-end extension. Iím not sure what speakers Iíll be using with this amp, but Iím sure that bass will be a strong consideration in making that choice. I think Iíll opt for the larger Edcors.
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Old Today, 04:06 AM   #5
ChetJettison is offline ChetJettison  United States
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I’m assuming 4 ohm transformers are the way to go if I don’t know what speakers I’ll be using?
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Old Today, 09:05 AM   #6
77seriesIII is offline 77seriesIII  Germany
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Normally, OPTs will have 4 and 8 ohm taps already built in, check the specs on the OPT and verify that 'fact'. if you are getting it wound, just request 4/8 taps or 4/8/16 or whatever it is that you need or desire, that way it is a non-issue.
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Old Today, 12:24 PM   #7
ChetJettison is offline ChetJettison  United States
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The big Edcor transformers seem to only have one output impedance option. I suppose I could call them and ask for a custom winding.
Would I just install a switch to select my output impedance?
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Old Today, 04:19 PM   #8
tonyp063 is offline tonyp063  United States
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Quote:
Would I just install a switch to select my output impedance?
You could, but it would be easier to just add an additional jack for the other tap(s)

FWIW I am using these with excellent results to 90dB speakers that don't do much below about 40Hz

EDCOR - GXSE15-8-5K
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Old Today, 04:25 PM   #9
ChetJettison is offline ChetJettison  United States
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So I actually just confirmed with Edcor that they don't build the single-ended output transformers with multiple taps. So that again leaves me wondering if 4 ohms is my best choice.
Correct me if I'm wrong: a 4 ohm amp can drive 8 ohm speakers, but an 8 ohm amp cannot drive 4 ohm speakers... if that's right, then it seems like 4 ohms is the way to go.
Open to insight on this.

Last edited by ChetJettison; Today at 04:38 PM.
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