I am going to assemble a TubelabSE for 45, if I manage to support also 2A3, good, but I will stick with 5K OPT, just use 8ohm tap with 4 ohm speakers.
Anyway, my problem is the 6.3 CT. Here in Japan the transformers are either 0-2.5-6.3 V or 0-5-6.3 V. The alternative is to have a separate transformer for the filaments.
With whitch one I have better chance to succeed ? I was thinking to use schotky diodes for all the bridge, in case I use the 2.5 V tap. From my calculation it should work and reduce also heat generation in the regulator.
This has a technical reason, as with 100 V primary 6.3 V has an odd number of turns.
Best Regards,
Davide
Anyway, my problem is the 6.3 CT. Here in Japan the transformers are either 0-2.5-6.3 V or 0-5-6.3 V. The alternative is to have a separate transformer for the filaments.
With whitch one I have better chance to succeed ? I was thinking to use schotky diodes for all the bridge, in case I use the 2.5 V tap. From my calculation it should work and reduce also heat generation in the regulator.
This has a technical reason, as with 100 V primary 6.3 V has an odd number of turns.
Best Regards,
Davide
I see what you are saying. You need 6.3V for the 5842 heaters, regardless, so you are stuck using that winding. You might be able to get by using the 5V tap and shorting R3.
Another alternative is to omit R3 and tie TI-3 to TI-4. Put he 2.5V winding across TI-5 and TI-7 like you are saying. Then you would use the 6.3 tap to power the 5842 heaters through the R3 pad. You could even use an external bridge and filter of you want to keep DC on those.
Another alternative is to omit R3 and tie TI-3 to TI-4. Put he 2.5V winding across TI-5 and TI-7 like you are saying. Then you would use the 6.3 tap to power the 5842 heaters through the R3 pad. You could even use an external bridge and filter of you want to keep DC on those.
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