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The making of: The Two Towers (a 25 driver Full Range line array)
The making of: The Two Towers (a 25 driver Full Range line array)
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Old 28th March 2018, 11:19 AM   #4201
wesayso is offline wesayso  Netherlands
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The type C will still be on my agenda. Somehow I have the feeling I will need some more power in the future...
Click the image to open in full size.
and thank you
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Old 28th March 2018, 11:30 AM   #4202
gkh is offline gkh  Austria
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You and needing more power? Never ever

You're welcome!
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Old 28th March 2018, 05:44 PM   #4203
xrk971 is offline xrk971  United States
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The making of: The Two Towers (a 25 driver Full Range line array)
Add a CL60 thermistor inrush limiter in series with AC.
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Old 28th March 2018, 06:13 PM   #4204
koldby is offline koldby  Denmark
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The inrush circuit Wesayso has ordered , has an NTC in series as inrush protection, but also a relay that bypass it after a delay. If you just have the NTC in series, you always have a resistance in series with the transformers and the Goldmund has a rather low idle current, so the NTC has a relatively high resistance under normal listening. This could degrade the dynamic capability. In a class A amplifier, a NTC in series can be a good solution IMHO
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Old 28th March 2018, 06:41 PM   #4205
DonVK is offline DonVK  Canada
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If this is connected to a GFI breaker, a very small ground leakage current will trip the breaker. Same goes for "rewired" homes that do not have balanced circuits, like when a line/neutral wire has been accidentally shared between two circuits.
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Old 28th March 2018, 07:20 PM   #4206
koldby is offline koldby  Denmark
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Called a HFI relay in Europe, but that is not the case here..
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Old 28th March 2018, 07:23 PM   #4207
wesayso is offline wesayso  Netherlands
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Indeed, from all we could find, it's the inrush that is the problem. Once the amp is on it has never been a problem. Once every few times the amp is turned on it will trip the breaker. It happened once on the day we were testing amps and two times after that.
I ran measurements in between and a couple of listening sessions etc.
It's a problem at turn on only.
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Old 28th March 2018, 08:45 PM   #4208
BYRTT is online now BYRTT  Denmark
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The making of: The Two Towers (a 25 driver Full Range line array)
Quote:
Originally Posted by wesayso View Post
...It's a problem at turn on only.
With a little help it adjusts in length like the new kitten what's not to like with dual 300watts that weights a ton and smelled like a serious system sound improvement.
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Old 13th April 2018, 11:06 PM   #4209
wesayso is offline wesayso  Netherlands
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I've been listening way less that I would want to, I'm still waiting for my purchased soft start relay to arrive. Ordering from China does have it's drawbacks.

Today I've done a long listening session but I realise I need to redo a lot to get the best out of it all. Basically everything has changed when I put this amp in it's place without the pré-amplifier. As said, measurements confirmed the differences I heard.
It does sound quite good though, right now, but I do believe I can do better. I've enjoyed the listening a lot, wish I could have gone on and on...

In the mean time I've been working hard to add some bling to the new amp, hope to show something soon. For no other reason than that it could be done. Not nearly finished yet, I just want to make the new amp look a little more integrated with the total concept.

After the soft start arrives I'll start new measurements and a couple of different ways to process that. I can hardly wait, but I'll have to...
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Old 20th April 2018, 11:33 PM   #4210
wesayso is offline wesayso  Netherlands
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Soft start relays came in this week. Today I've put it into place in the amplifier. Done about 7 starts, all went well. You can hear the relays click in one after another.
On to the next job, some exterior modifications. And when I have time again, new measurements.
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