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Old 20th September 2021, 02:39 PM   #81
Toobuzz is offline Toobuzz  United States
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Join Date: Jul 2021
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I wish that I could compare the stock transformers to the Lundahl AM, but I ordered the Lundahl only and have never heard the stock opt. I understand that the amorphous core can take longer to settle in, so I am only sharing some preliminary impressions. Over the next few weeks, I will be taking my 8900 around to friends to hear it on a variety of speakers and systems.

Up until this point, my journey with tube audio has consisted of trade-offs between lush, rich and meaty textures and HiFi things like frequency response, resolution, placement in the soundstage, etc. I'm not sure if it's the 2A3, the Lundahl, or the design of the amp itself, but it is all working together beautifully on the 8900.
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Old 24th September 2021, 10:38 AM   #82
pk3lee is offline pk3lee  Australia
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Join Date: Jan 2007
Just finished assembly Tu-8900. After testing all the test points voltage. The sound is amazing even before run-in.
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Old 28th September 2021, 02:42 AM   #83
su02 is offline su02  Australia
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I have finished my TU-8900 assembly last weekend. I have added a cooling fan on the two red boards.
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Old 28th September 2021, 02:47 AM   #84
su02 is offline su02  Australia
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If someone can tell me how to attach a photo in here? Thanks!
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Old 28th September 2021, 02:52 AM   #85
vkung is offline vkung  Canada
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The manual does not ask you to add a cooling fan.
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Old 28th September 2021, 03:01 AM   #86
su02 is offline su02  Australia
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for myself, I still like to see the board temperature drop from ~49oC down to ~30oC. I feel confidence when run this amp in the coming summer time.
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Old 28th September 2021, 03:11 AM   #87
vkung is offline vkung  Canada
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as long as you have good ventilation, the cooling fan is unnecessary
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Old 28th September 2021, 03:18 AM   #88
mchandra is offline mchandra  Singapore
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Join Date: Apr 2021
Cooler temp is generally good to keep the electronic parts last longer. But how do u connect the fan to power and ensure the electrical noise from fan does not come into your amp system.
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Old 28th September 2021, 03:33 AM   #89
su02 is offline su02  Australia
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I used a 12V computer CPU cooling fan.
DC supply is used a 12V switching mode adapter.
A variable regulator and adjust the voltage to ~8.5Vdc.
On this voltage the fan running quite and not heard any noise from my Lowther PM6 speaker, and also not audible the fan noise from a distance of 1.5m.
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Old 28th September 2021, 08:34 AM   #90
paczeltf is offline paczeltf  Hungary
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ELEKIT TU-8900 2A3/300B
Computer cooling fans inevitably release a lot of high frequency electrical noise. Even if you do not hear it from the speakers, it is very likely that the noise would appear on a scope.
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