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D150 monster amp and funny tooobz
D150 monster amp and funny tooobz
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Old 20th November 2018, 12:33 AM   #21
koja is offline koja  Canada
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and this is how I will be moving it around
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Old 20th November 2018, 12:36 AM   #22
rayma is offline rayma  United States
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and this is how I will be moving it around
You have brakes on those wheels?
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Old 21st November 2018, 02:33 PM   #23
koja is offline koja  Canada
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no brakes. I will probably wedge a wheel if it moves on making connections.

btw I did not have the time to look up the schematic I have somewhere to see if the component numbering matches those you used when pointing me to after the phase inverting circuit past which amp runs as balanced.

Do you happen to know what kind of input impedance I could have with the balanced input? I would be using Aleph P preamp which has a volume attenuator at its output and a highish output impedance.
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Old 21st November 2018, 02:51 PM   #24
rayma is offline rayma  United States
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Do you happen to know what kind of input impedance I could have with the balanced input?

The resistors at that point are 470k, but could be changed.
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Old 21st November 2018, 04:41 PM   #25
H713 is offline H713  United States
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And I thought the amp I was building was going to be heavy. Holy crap, 150 pounds? Hope you don't have to carry it up any stairs.
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Old 21st November 2018, 05:06 PM   #26
koja is offline koja  Canada
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I only now noticed that the input sensitivity of D150 was only 2.2V for full rated power?? than there is nothing to worry about as it will not take much gain. preamp will really be for driving the volume attenuator.
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Old 21st November 2018, 07:56 PM   #27
rayma is offline rayma  United States
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I only now noticed that the input sensitivity of D150 was only 2.2V for full rated power?
That's not unusual for tube amps of that era.
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Old 21st November 2018, 09:01 PM   #28
analog_sa is offline analog_sa  Europe
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D150 monster amp and funny tooobz
A few years ago i did a complete rebuild on a KSA250. Had i waited a couple more years, it would have been past my lifting abilities.

There is a clear danger of exceeding the scope of such a job. I wish someone had warned me
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Old 22nd November 2018, 03:08 PM   #29
koja is offline koja  Canada
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original fans are known to be noisy so they will be replaced with a modern quiet alternative. they are grid voltage driven and there is no data available (that I could find) on their air flow performance.
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Old 23rd November 2018, 03:06 AM   #30
stocktrader200 is offline stocktrader200  Canada
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3 12v 4 to 5 inch fans should do the job. run them from the heater ( 6.3v) winding with rectifier and 1000uf / 25v cap. rectified voltage should be around 10v so the fans will be quieter.
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