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Old 25th March 2011, 08:34 PM   #521
AndrewT is offline AndrewT  Scotland
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Hi,
1.) test the transformer alone on the bulb tester.
2.) Add the rectifier and test again.
3.) Add the smoothing and test again.
Set the bias pots to zero resistance so that the output bias is also zero amps.
4.) Add one channel of F5 and test again.
5.) Add second channel and test again.

Tell us at which stage the bulb stays on.
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Old 25th March 2011, 09:06 PM   #522
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Quote:
Originally Posted by merlin2069er View Post
I'm still in the process of putting it together.
Oh. Well, there would certainly not hurt to obtain one of the better ones, I've seen a few successful F-5 builds using the Antek 400VA model. But if the money isnt an issue go for more quality. Myself, I'd build with it and up grade later if necessary.

Russellc
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Old 25th March 2011, 09:10 PM   #523
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Quote:
Originally Posted by CanAm Man View Post
Good question. I'll be talking to Antec about my 400VA model......

In any/all cases, I found their tech data to be very interesting.......!

Probably the best is to listen to the amp, and see if you like what you hear. (Of course, without an identical amp with a bigger VA transformer, it will be a "one-deep blind test".....)
Please share your findings CanAm man on these transformers. I would love to know the outcome of this.

Thanks for the inquirey,

russellc
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Old 25th March 2011, 09:15 PM   #524
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Originally Posted by Nelson Pass View Post
The Antek 300VA is a hefty chunk of core. It should do the
job nicely unless you're planning something special.

Thanks for weighing in. I assume if the 300 VA is OK, so is the 500 VA, or does that not naturally follow? (mine is a standard F-5, but I am contemplating a Cviller board F-5 with dual pairs of mosfets, is that "special" enough to cause problems?)

Thanks for the input,

russellc
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Old 25th March 2011, 09:46 PM   #525
sts9fan is offline sts9fan  United States
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Light bulb in series. No blown fuse. ~7vdc at caps
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Old 25th March 2011, 09:51 PM   #526
labjr is offline labjr  United States
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Did you try a 2.5A slo-blo fuse?
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Old 25th March 2011, 09:52 PM   #527
sts9fan is offline sts9fan  United States
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I just ordered some. The store I went to only had fast.
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Old 25th March 2011, 09:53 PM   #528
labjr is offline labjr  United States
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My local Rat Shack had them a couple months ago. Where in MA do you live?
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Old 25th March 2011, 09:54 PM   #529
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by sts9fan View Post
Light bulb in series. No blown fuse. ~7vdc at caps
bulb glowing , I resume ?

PSU is fed with just 30% of voltage

something is drawing too much current

so - to cut the chase - give us pic of your PSU , exact datasheet of used xformer , for which mains voltage xformer is wired ;

somebody already wrote that you probably mis-wired primaries
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Old 25th March 2011, 10:28 PM   #530
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Quote:
Originally Posted by Russellc View Post
Oh. Well, there would certainly not hurt to obtain one of the better ones, I've seen a few successful F-5 builds using the Antek 400VA model. But if the money isnt an issue go for more quality. Myself, I'd build with it and up grade later if necessary.

Russellc
Russell, I'm running the 400VA model. The amp sounds great, but my rail voltages are lower than I expected. In addition, during some additional load testing at work, my 400VA (can't speak for others.....) seems to have poor regulation; significant secondardy voltage drop as current increases..... worse than the Antek specs inidicate.

Again, for now, the sound of the amp is very good, with high efficiency speakers. Later on, I'll do some audio load tests, and see how the amp and PSU (and transformer) respond.

Having said that, I still hope to engage Antek in a conversation regarding their specs on the 400 VA, and what I'm seeing in actuality.

Will keep you posted.
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