drop 6.3 to 5v for recto

mark enger · Post by **mark enger** » Fri Oct 05, 2012 9:03 pm

Is it possable? Thanks mark

tubeswell · Post by **tubeswell** » Fri Oct 05, 2012 9:06 pm

Voltage divider? (You'll lose a bit of current)

Structo · Post by **Structo** » Fri Oct 05, 2012 9:34 pm

How about a couple silicon diodes of the proper current rating?

It would drop 1.2v

rdjones · Post by **rdjones** » Fri Oct 05, 2012 10:19 pm

Don't try this on a typical guitar rectifier tube.
The filament is connected to B+.

rd

Structo · Post by **Structo** » Fri Oct 05, 2012 11:49 pm

Yeah, you're right.

mark enger · Post by **mark enger** » Sat Oct 06, 2012 12:46 am

so no not possable, ill go ss the. i have some ss plug ins i could use being the the sockets there already, now for sag R maybe a sag control? mark

Jana · Post by **Jana** » Sat Oct 06, 2012 1:46 am

How about putting a 0.68 ohm, 5 watt resistor in series with the leg of the 6.3 volts that is not common with the B+? That should drop about 1.3 volts with a 2 amp load.

VacuumVoodoo · Post by **VacuumVoodoo** » Sat Oct 06, 2012 9:58 am

Both legs are common with B+, there's 5V AC riding on B+ if you look closely with an oscilloscope.

Jana · Post by **Jana** » Sat Oct 06, 2012 12:51 pm

Yes, I understand that the 5v winding rides at the B+ level. However, the B+ would not be going "through" the dropping resistor.

VacuumVoodoo · Post by **VacuumVoodoo** » Sat Oct 06, 2012 2:57 pm

So, what is the problem with additional max 250mA when you already are pulling 2 or 3 amps through that resistor? You need a 5W or 8W resistor anyway. Any minute sag this introduces is only of academic interest , if any at all.

martin manning · Post by **martin manning** » Sat Oct 06, 2012 4:22 pm

Suppose you experienced a short somewhere on the DC side of the HT... If that momentary (until a fuse or something else opens up) surge current comes through the rectifier's filament, maybe it would take the rectifier out too?

Prairie Dawg · Post by **Prairie Dawg** » Sun Oct 07, 2012 3:50 am

Why not use 6v rectifier tubes? 6CA4, 6AX5. 6X4 and a number of loktals are six volt, or say 2 3dg4s in series?

renshen1957 · Post by **renshen1957** » Sun Oct 07, 2012 4:15 am

Prairie Dawg wrote:Why not use 6v rectifier tubes? 6CA4, 6AX5. 6X4 and a number of loktals are six volt, or say 2 3dg4s in series?

+1

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drop 6.3 to 5v for recto

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