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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 21st September 2010, 02:05 PM   #1
sherpa is offline sherpa  United States
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Default Power XFMR Choice

i'm looking at using Edcor's XPWR144 power xfmr for a simple se. my concern is the 3.5A limit on the 6.3 winding, will this be ok or should i try something different? the reason i'm going for the 144 is the 380/320 CT winding will give me options to drop the B+ rail for other tubes.
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Old 21st September 2010, 03:15 PM   #2
neonthecat is offline neonthecat  Canada
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The SSE Assembly Manual states: "The main filament winding should be 6.3 VAC at at least 5 amps."

So, the Edcor XPWR144 may run too hot (or worse) when used at 5 amps.
The folks at Edcor are very helpful. Give the Technical Dept. a call for the definitive answer.

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Old 21st September 2010, 03:32 PM   #3
Tubelab_com is offline Tubelab_com  United States
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I specify a 5 amp winding to cover all possibilities with some margin. A SSE with KT88's will draw exactly 3.5 amps if all of the tubes are exactly at spec. An EL34 version will draw 3.3 Amps. The filament current could easily be +/- 10% or so. This could put the current close to 4 amps. A 4 amp winding would work, but 3.5 is rather close. See what Edcor says.
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Old 18th October 2010, 09:05 AM   #4
Ian444 is offline Ian444  Australia
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I asked a similar question to Edcor recently, the answer was that their heater windings are designed to handle 10% more current than what they are rated for. So you can pull an extra 10% and after that you're on your own...
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