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Old 17th March 2013, 01:33 PM   #641
kazap is offline kazap  Australia
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Quote:
Originally Posted by Desmo View Post
Huge caps..!? They are not huge... (I don't know what you are talking about)...
Well that makes two of us then

Decky is going to use shielded wire for the side mounting of the Coleman reg's so hopefully that will be an antidote to the poison you mentioned?

I also wonder if using grounded copper tubing as shielding for the wires would be a good or bad idea?

Click the image to open in full size.
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Old 17th March 2013, 01:44 PM   #642
Desmo is offline Desmo  Denmark
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There is no reason to create solutions looking for a problem... Again: The wires from the mains transformer to the rectifier diodes / first caps on the raw dc supply must be as short as possible...
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Old 18th March 2013, 07:28 AM   #643
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To all of you that are thinking of the Rod Coleman regulator heater solution, see Mortens pictures and stick with his layout in this thread. He has done the R & D and it works for him. No good trying to re-invent the wheel when there is an excellent solution at hand. Keep it simple with short wiring.

Peter
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Old 18th March 2013, 10:38 AM   #644
kazap is offline kazap  Australia
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Originally Posted by ptashton View Post
To all of you that are thinking of the Rod Coleman regulator heater solution, see Mortens pictures and stick with his layout in this thread. He has done the R & D and it works for him. No good trying to re-invent the wheel when there is an excellent solution at hand. Keep it simple with short wiring.

Peter
I agree Morten's design is impeccable but he is in temperate Denmark.
What do you think of the idea we need a heat proof alternative for global warming challenged locations? I want to run my Tram2 without a fan and not have my preamp spend half its life in the service lane.
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Old 18th March 2013, 11:16 AM   #645
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Hugh, if DIYHIFI think the heatsink of the version 3 heater module is acceptable to handle th 2A3 heater current, then the heatsink on Morten's Coleman module is an overkill. Ever wih the DIYHIFI heater modules with Mortens heatsink, that is an overkill for the heat generated. About five years ago in August, I was in England, France, Belgium, Netherlands and it was 30 to 35 degrees Celsius. I was in China in August two years ago and it too gets hot and humid.

If Mortens Rod Coleman regulator heatsink setup keeps quite cool at 2A3 usage then in sunny Queensland at 10 degrees higher, it should not be a problem.

Has anyone using Rod Coleman regulators and Morten's heatsink setup in hot countries, please tell us about your experiences whether good or bad.

Peter
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Old 18th March 2013, 06:57 PM   #646
Desmo is offline Desmo  Denmark
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Originally Posted by ptashton View Post
Hugh, if DIYHIFI think the heatsink of the version 3 heater module is acceptable to handle th 2A3 heater current, then the heatsink on Morten's Coleman module is an overkill. Ever wih the DIYHIFI heater modules with Mortens heatsink, that is an overkill for the heat generated. About five years ago in August, I was in England, France, Belgium, Netherlands and it was 30 to 35 degrees Celsius. I was in China in August two years ago and it too gets hot and humid.

If Mortens Rod Coleman regulator heatsink setup keeps quite cool at 2A3 usage then in sunny Queensland at 10 degrees higher, it should not be a problem.

Has anyone using Rod Coleman regulators and Morten's heatsink setup in hot countries, please tell us about your experiences whether good or bad.

Peter
That's right Peter: First... I have several times the cooling area of the original DHT regulators, and therefore there is NO HEAT ISSUES... Second, this is not the north pole, we have hot summers here and there is no problems what so ever.

Really: There is no reason to keep beating that dead heat-issue horse. There was a heat issue with the first versions of the original dht regulators from diyhifisupply. This has been corrected now with their third version, and with a solution like mine with even bigger cooling area, the temp is even lower. I just wish that people would move on instead of going on, and on and on about this. Stop worrying about heat and enjoy some music...! BTW; the hottest part on my tram II besides the tubes, is the mains transformer cover.

What people has to get used to is, that this is a class A amp used as a preamp, and class A amps simply run hotter than other designs. If this is not acceptable, then use another preamp that is not a Class A amp used as preamp.
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Old 18th March 2013, 08:32 PM   #647
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Morten is right about the heat..this pre runs a bit hot..but makes no problem at all-
any news about the Brimar tube Morten ?
best Bjarne
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Old 19th March 2013, 08:28 AM   #648
Desmo is offline Desmo  Denmark
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Hi Bjarne, The Brimar rectifier is really nice... I'm getting used to it's sound now and in a few days after some more listening I will go back to the Philips. I will update with a comparison between them, and some pics of the Brimar to show it's construction if anyone is interested in looking for one...
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Old 23rd March 2013, 08:37 AM   #649
kazap is offline kazap  Australia
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Default Do tubes need a burn in?

The following advice is via EML. I wonder if it applies to other tubes including rectifiers? If it does I cant comment on the sound of Peter's beautiful NOS GEC U52 as I only put about two hours on it.
Good tube burn-in will assure maximum lifetime and develop the final sound This burn-in process will be extended in the first 50-100 hours under normal (home) use conditions. This means you must switch off the amplifier after each use, and in the beginning not use the tubes longer than 4 hours at one time. Many short use periods have a better result than few long periods. The tubes need the „cold“ periods in between for best formatting of the filament. Use different loudness levels from the beginning, and increase the maximum loudness gradually. If tubes with very little use were switched off longer than 12 months, is necessary to repeat the burn in.
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Old 23rd March 2013, 09:19 AM   #650
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Hugh, a very good piece of tube information. Do you have the Philips rectifier tubes yet.

Peter
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