Audiophiles are discovering the same thing. Who would have thought there would ever be a audiophile boutique amp made with a 50L6, for example?
Joe, N6DGY On Jan 21, 2:12 pm, Adam Jacobs <[email protected]> wrote: > This is how the old AC/DC television & radio sets worked. Originally, tube > filament voltages were standardized at 6.3vac. You would see a filament > transformer in the set that would run the filaments (in parallel).. later, > some bright spark figured out that if you run all of the filaments in > series in the entire set (+ a resistor) you can get up to 110vac. > Whenever you see a tube with a 31v or 24v filament voltage, that is what > those tubes were designed for. In an ironic twist, hams have learned that > the more obscure filament voltage versions of the original parts are > oftentimes less rare (less expensive). With the addition of a special > filament transformer specific to the particular tube, they can be used as > drop-in replacements. > > -Adam > > > > > > > > On Sat, Jan 21, 2012 at 3:01 AM, fixitsan <[email protected]> wrote: > > > I've been planning on doing something about losing the energy > > absorbing resistors I presently use to hold the filament voltage at > > 2.45V on the IV-17 Smartsocket > > > Here's an idea which might be of interest. Putting two filaments in > > series produces a requirement for 4.9V. I have a 5v supply and if i > > apply that to the filaments i am in the ballpark. Except, there is > > quite a large gradient across 2 tubes. > > > Apologies if this has already been suggested, but I can't see much of > > a problem with connecting the 2 series filaments to the output of an H- > > bridge being switched in both directions at a few hundred Hertz. > > Although I can use a microcontroller output to drive the H-bridge, any > > switching signal could be used. No need for AC or a transformer like > > this. > > > Chris > > > -- > > You received this message because you are subscribed to the Google Groups > > "neonixie-l" group. > > To post to this group, send an email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group at > >http://groups.google.com/group/neonixie-l?hl=en-GB. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
