Re: Wot? No tube mixer??

On Apr 22, 10:24 am, John Byrns <byr...@xxxxxxxxxxxxx> wrote:
In article

Correct, but the parallel connected lamps in your house are feed from
what is essentially a constant voltage source, not a constant current
source.  If you house hold power was supplied by a constant current
source, each time you turned on another lamp the ones that were already
on would get dimmer, and if you had only one lamp on it probably
wouldn't last very long before burning out.

Um - let's make sure I understand this correctly - current is limited
by the fuse on each individual leg. *BUT* the amount of current
relative to the individual devices is unlimited, the fuse being the
actual controlling factor? That makes more sense - But if the filament
winding is sufficiently robust (and it should be in a well-designed
transformer), would this not be essentially the same condition - the
tube filament (heater) becoming the de-facto fuse?

Now, something that would exceed the current capacity of a transformer
winding sufficiently to cause individual tubes to behave differently
based on differents in filament draw (but still within "normal"
operating specifications for each tube) should be a remarkably rare
condition - again assuming a properly designed transformer?

Peter Wieck
Melrose Park, PA
.

Relevant Pages

  • Re: 6.0 volt Filament
    ... transformer as an autotransformer to reduce the voltage and use this to feed ... the filament transformer. ... voltage drop more than 5% when you key up :-). ... Above this frequency the tubes cathodes start to self heat a bit due to back-bombardment by electrons as the tube reaches self-resonant frequency. ...
    (rec.radio.amateur.homebrew)
  • Re: Question re TL 922 amplifier
    ... The short causes the tube filament to effectively stay at ground potential ... you are running the risk to blow the service transformer. ... a Kenwood design fault: when a grid-to-filament short occurs, ...
    (uk.radio.amateur)
  • Re: Toshiba CRT A80ERF031X13 Shorted, appreciate advice
    ... filament circuit from the flyback and ran the tube filament from a DC ... when CRTs were run from 6.3 V AC on a transformer ... turns ratio, but with very good high-frequency isolation, that you ...
    (sci.electronics.repair)
  • Re: tube amp blows fuse
    ... ** A shorted rectifier will blow the fuse at switch on. ... ** A shorted filter cap would not blow a fuse until the rectifier heated up. ... An insect shorting an anode pin to chassis would not care if the tube was fitted. ... Upon inspection,I had found a filament wire that had rubbed through the insulation,right where it comes out from the trany's end-bell.Usually might not have been a big problem,except the filament winding was center-tapped,and grounded. ...
    (rec.audio.tubes)
  • Re: Inrush Current Limiter for Hallicrafters S-40B?
    ... The B+ voltage delivered by the new transformer is about 50 volts higher ... The other secondaries for the tube filaments and rectifier ... and there was no visible evidence of any problems in the radio wiring. ... The fuse still blew. ...
    (rec.radio.amateur.boatanchors)