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In Reply to: RE: Power tube for Bass SET or SEP ? posted by Caucasian Blackplate on February 26, 2015 at 17:40:31
The question was rather general in nature. If I had money and courage I'd do 845 PSE or GM70 at 1.2kV but it's not happening any time soon.
Bass enclosure is not tuned. It's going to be either 2x Tad 1602 (15") in 12-14 Cu ft closed box or 2x 10" in 4-5 cu,ft closed box. I would like to have reasonable bass from both. TAD is not a bass driver although has 21 hz Fs but it is what it is. 10" are nice but have only 88-89Db each so ~91dB for a pair. Should be OK for small room. Upper ranges will handle Tannoy 10" Red in 2.5 Cu ft or possibly some horns in Grand scheme or Tannoy or Living Voice Avatar if the room will be small In either case I think 25W should be more or less OK, good enough for who it is for ...So far I have PSU parts . 510-0-510 /0.7A , 10H/500mA choke ,6x1200V/8A stealth rectifiers , 2x4000uF/550V (may consider adding another few thousand uF )
Something like KT120 PSE with 100ma /~480V ...
Don't get me wrong , I learned to enjoy 45 , 2a3 , 300B SETs on their own.
Simply trying to figure out if I can make sensible SET/SEP bass amp on the cheap with parts I already have and looking for the tube known for good bass. TIA W
Follow Ups:
I do not believe that SET amps can play bass well do to the load line becoming an ellipse at low frequencies caused by a lack of inductance.
To the best of my knowledge, for 20hz to be flat and phase shift free, and the load line remain not an ellipse, the inductance for a 2500 ohm transformer needs to be 200Hy and that's not gonna happen in a air gapped OPT.
I could be dead wrong.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
From a design perspective (other than size and cost) what is the problem with a DC carrying SE bass amp output transformer having 200hy's of inductance? Rather than design for 20hz-20Khz (10hz to 40Khz) for a full range amp, drop it an decade and shoot for 2-2000hz for a bass amp.
dave
Yes, custom winding.
That would be great for those who want a SET bass amp.
How about a DC carrying SE mid/tweeter OPT for 200Hz to 200kHz?
Is that doable?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
You can get nutty with a big CCS and neutralize some of the idle current with a dedicated winding and cut the air gap...but that is a lot of energy to just make heat with.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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