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Old 7th December 2006, 08:19 PM   #1
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Default Filament Transformer for 26 DHT

folks,

I'm looking for a 1.5VAC 1.5A transformer for a 26 DHT. Any ideas where I may be able to find one?

TIA,

-- josť k.
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Old 7th December 2006, 08:27 PM   #2
Tweeker is offline Tweeker  United States
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Use a 2.5V transformer and a 2/3 ohm resistor on each side if you must, cuts inrush down too.
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Old 7th December 2006, 08:44 PM   #3
zobsky is offline zobsky  India
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You probably want to use DC on this tube, judging from several reports. So think about using a higher voltage filament transformer, .... rectify, filter and regulate the voltage down to 1.5V.
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Old 7th December 2006, 09:00 PM   #4
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No, I am purposely experiementing with AC heating.
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Old 7th December 2006, 09:21 PM   #5
zobsky is offline zobsky  India
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cool, ..let us know if it works out, I have a pair of 26 at home too. make sure you get something that can support the 1A rating of the tubes.

Another possibility is connecting the filaments in series if you can find a 3V transformer (maybe others can comment on how desirable this is)
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Old 7th December 2006, 09:41 PM   #6
316a is offline 316a  England
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Hi ,
How about a cascade of transformers ? Something along the lines of :

primary:secondary-----primary:secondary------26
115:30-------------------------115:6

That should get you up and running , trim the voltage with series resistors if needed

cheers

316A
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Old 7th December 2006, 09:54 PM   #7
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Wind your own; that's what I did. 1.5 vct is a pretty easy job. Get a 5 volt or 6.3 volt filament transformer, unwind the secondary while counting the turns to get the turns per volt ratio. Then multiply that by 1.5 to get how many turns are required for 1.5 volts. Divide by half to get ct.
I am in the process of building Kevin Kennedy's 26 preamp and I have never liked DC on DHT's. I could not find a 1.5vct transformer anywhere so I just wound my own. I made a dedicated winding for each 26 tube. Maybe the hum will be too much , I guess I'll find out!
Good luck, Daniel
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Old 8th January 2008, 06:25 PM   #8
zobsky is offline zobsky  India
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Any results (positive or otherwise) to post regarding AC heated filaments with this tube?
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