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Old 30th July 2011, 06:27 AM   #1
emosms is offline emosms  Bulgaria
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Join Date: Sep 2010
Default voltage boost

Well, I took a closer look at the power supply ..yesterday:
View image: r102 amp supply
Could it be that easy to boost the HT to 320v, just removing R1?
I want to get more power out of the two EL84 tubes.
not sure if I have to adjust R14 accordingly.
The screen grids are just connected to the ouput transformer
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Old 30th July 2011, 06:52 AM   #2
emosms is offline emosms  Bulgaria
diyAudio Member
Join Date: Sep 2010
Btw, calculating by turns ratio, the transformer gives 256 volts secondary.
don't know how to calculate how much the diode bridge "elevates" that.
The primary winding consists of the following loops in series:
1. 114 turns 0,57 mm
2. 308 turns 0,41 mm
3. 308 turns 0,41 mm
If I exclude winding 1 (114 turns) I would get 304 volts secondary
Is that advisable at 220 volts primary voltage?
I Know I have to look at some charts, if 0,41 mm is capable of withstanding the current.
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Old 30th July 2011, 12:26 PM   #3
DF96 is offline DF96  England
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Join Date: May 2007
The primary purpose of R1 is smoothing, so removing it is likely to introduce buzz. You could try reducing it. Alternatively, use EL86 which are intended for a lower HT voltage than EL84.
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