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Old 1st July 2005, 08:08 AM   #1
trancy is offline trancy  Slovenia
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Default 211 amp PSU question

I found this schematic, and I want to build that beatiful baby....so, can I use PSU for both channels, and if not, what should I change??



http://tinpan.fortunecity.com/saints...mer/211-se.gif


lp

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Old 1st July 2005, 11:29 AM   #2
SY is offline SY  United States
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You'll need to redesign the PSU for double the current at each winding. That means a transformer with double the current rating, using rectifiers with double the current capacity, doubling up the warmup control 5AR4, and modifying the filtering (bigger C, bigger L, more current capacity for the L) to drop the ripple back to the single PSU values.

It's not trivial, but it could be done. Given how exquisitely sensitive SET is to the power supply, you want to do this carefully and systematically to avoid burning up money needlessly.
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Old 4th July 2005, 10:24 PM   #3
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The referred circuit looks a Japanese one and I notice particular power transformer which was once popular in the market. The high voltage windings have enogh current capacity to support two channel amplifiers. Also, 5AR4 and choke coil can work for two channnels. Thus what you additionally need is another filament supply (10.5V) which is not shown in the drawings.
I build a similar amplifier more than 20 years ago and it works pretty fine up to now.
Good luck!
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Old 5th July 2005, 05:54 AM   #4
trancy is offline trancy  Slovenia
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so actually goes 100mA on channel at 900V and +/- 30mA for 6SN7`s...is that enough??

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Old 5th July 2005, 09:06 AM   #5
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I cannot follow your calclation, but 900V line consumes around 80mA per channel and 10mA or so for the lower +B line. Thus, you do not have to worry about the power supply capacity.
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Old 5th July 2005, 12:04 PM   #6
trancy is offline trancy  Slovenia
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thanx .... i get it...
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