Elrog 300B vs Takatsuki 300B tubes

Hi George thanks for chiming in. So as far as Elrog 300B in Lampizator Golden Gate DAC is concerned, a rectifier that draws 2A/5V is fine (assuming GG DAC has a separate 3A winding for rectifier tube)?

Yes, thanks for chiming in, George. After thinking about your comment I agree -- the 5 volt winding for the directly heated 300B and the 5 volt winding for the rectifier must be separate, or the circuits wouldn't work properly. Thanks for pointing that out.

I'm still a bit uncertain, though, that it would necessarily/always be appropriate, with respect to long-term reliability, to use a 2 amp rectifier on a winding that is designed with the expectation that it would be used with a 3 amp rectifier. My concern, as I mentioned earlier, being that the filament voltage provided to the rectifier would increase to some unknown degree compared to the voltage that would be provided to a 3 amp tube, due to the lighter loading on the winding.

Thanks again. Best regards,
-- Al

Al,
If you have 200 amp service in your home, do you use all of the current that your electrical service box offers? Of course not. It's there to insure capacity. Also, many 5 volt filament transformers for output tubes provide in excess of the 1 1/4 amps that a traditional 300b tube will draw.

Right now I happen to be looking at a Hashimoto power transformer that has a 5 volt/3 amp winding for each channel of a 300b amplifier. The tube doesn't need that amount of current, but will function just fine connected to it. The output tube draws what it needs from the current reservoir. The same goes for a rectifier tube. With rectifier tubes, you control the amount of B+ you have in your circuit by deciding on your choice of rectifier tubes.

Many people talk about how one rectifier tube sounds over another, but the real reason for this is the amount of B+ that has been added(or reduced)into the equation. This causes the output tube to work at a higher or lower anode voltage and that of course will influence the sound of what is being heard. Hope this helps.

Best,

George

Based on what George just said, I suppose the answer to my question is a yes.

Thanks, George. I don't doubt that what you are saying is correct in most and perhaps nearly all cases. But without knowing the DC resistance or low frequency impedance of the filament winding of the particular transformer (which would enable calculation of the voltage that is dropped across it for a given current draw), and perhaps also the +/- tolerance on the transformer's turns ratio, I'm not certain we can say that for sure. Although I will state that I don't have a particular feel for what those numbers are likely to be for the kinds of power transformers that are used in audio components such as these.

Again, see the statement by Matthias of Elrog that I quoted in my first post dated yesterday (10-28-15).

10-28-15: Dracule1
So as far as Elrog 300B in Lampizator Golden Gate DAC is concerned, a rectifier that draws 2A/5V is fine (assuming GG DAC has a separate 3A winding for rectifier tube)?

10-29-15: Dracule1
Based on what George just said, I suppose the answer to my question is a yes.

Yes, certainly as far as the 300B is concerned, given George's point about the separate filament windings. And most likely as far as the rectifier is concerned, although per my comments above I for one am not sure we can say that with certainty.

FWIW, IMO, etc.

Best regards,
-- Al