Submini tubes

[makinrose]

Hey Kevin, 
Thanks for the reply. I understand you advising against tube pedals. Whenever I see 12AX7 or 12AT7 tubes sticking out of pedal enclosures I immediately think, "that's gonna break quick." That one of the reasons I chose to go with subminis. They seem easier to protect, being so tiny. I'll be using JAN 6948s, guided missle tubes, so yeah, they should be a bit tougher than your average HIFI tube   

Also, pedal builders seem to ignore these tubes as a resource, so what better gimmick to have 

I'm a bit wary of kicking things in a pedal to 200V. I always find electrocuting customers is a bad business model lol. I was thinking of using a small voltage converter to supply ths heater(s) with 60V to maybe as high as 90V from a 12V or 18V wall wart.

Your last paragraph seems to suggest just taking a basic 12AX7 circuit and changing the tube to a JAN 6948. I must be reading that wrong, because in my experience things are never that simple. 

Lastly, I'm assuming since I'm using such low voltages, the standard 1/4W metal film resistors I use in my pedals would be sufficient?
Cheers
Steve

Cool project.....My suggestion would be not to go too low on the voltages to the tubes....60V might not sound very good. The data sheet for the 6948 has example circuits that would be a good starting point and data for plate voltages for 100V to 250V.  Since .6W or 1/2W metal film resistors are so tiny I'd personally stick with those or if I was to use 1/4W resistors I'd calculate the dissipation  to be certain it's in spec.