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Hammond 270DAX ?


 
6/5/2005 6:19 PM
Jones Hammond 270DAX ?
Will a hammond 270DAX handle a pair of 5881s if you dont bias them too hot (cathode bias)? This PT is only rated for 90ma at 260v, I am only wanting to get about 25watts out of the pair. I know hammonds are rated conservative...but...tube manual suggests 2 5881s draw 88ma plus 5ma screen. There is only 1 Preamp tube drawing about 3ma, this is mainly a 6v6 amp but want to be able to switch in some 6L6 types.
 
6/6/2005 8:10 AM
Alexander
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Hey Jones-  
 
That 270DAX will handle an SE 5881 but forget two of 'em. I use that tranny for 2 EL84's and it struggles with THAT load ! sounds loose and buttery but would be disaster for 2 -5881's. Stick with the 6V6 loads or upgrade to the 270FX(150ma)or HX (200ma)  
 
HTH,  
Alexander  
http://www.retrodyne-amps.com
 
 
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6/7/2005 12:02 AM
Josh
Yes, The hammonds are tough, but they are designed for 115v wall volatge. In the US, wall voltage can be really high(128v+). So you are making it run hard right from the get go. Most of the hammond power transformers I have used run hot. Even when pulling lighter loads (110mA from a xformer with 150mA) they get really hot. I have never had one fail, but I like to get the biggest hammond I can fit just so it stays cool.  
 
Now the output transformers.....those really are indestructable :)
 
6/24/2005 9:12 PM
Jones
I have just decided to throw that Tandberg radio xfrmr in it. That thing is bulletproof, nazi construction. actually has a swastika on it...it ran 11 preamp and tuning indicator and VU meter tubes and 2 power tubes in a big tape deck. It dont even get warm with a pair of EL34s and a couple 12ax7s.
 
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