Tube DIY Asylum

RE: CJ...

82.44.163.8

In Reply to: RE: CJ... posted by gluca on June 30, 2008 at 14:15:09

75TH are a nice find indeed :) You definitely don't want any resistors or chipregs in the fil supply ;) I just did an amp with VT127 with it's 5V @ 10.5A filament . At 10.5A even soldered joints have a slight volt drop , the whole thing was 'cold-welded' . I used LCL with small 0.15mH 20A chokes to trim the voltage at the filament pins : 350VAtx-schottkeys-2mH+0.15mH-125,000uF-8mH with two SG240 NTC on the filament transformer primaries . I'd recommend a similar scheme for the 75TH ;)

Those switchers are attractive but I wouldn't want one in the signal path . You could probably get better results by using an isolating choke in series with the filament , maybe even a CMC .

Follow Ups:

RE: VT127A - thermionic addictions 10:33:05 07/01/08 (4)
- RE: VT127A - . 12:05:25 07/01/08 (3)
  - RE: VT127A - thermionic addictions 13:40:54 07/01/08 (2)
    - RE: VT127A - . 15:54:23 07/01/08 (1)
      - RE: VT127A - thermionic addictions 14:01:46 07/02/08 (0)
I will try ... - gluca 02:06:20 07/01/08 (0)

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