At some point recently, I realized that my transformer for the Real McTube had not yet arrived. Why I needed a new one is chronicled here. A bit of looking around showed me that the reason I was not in possession of the transformer was because I never ordered it.
I was talking about the Hammond 269 before (not overly cheap, to be sure) but as luck would have it, I found a better choice for this application. Antique Electronic Supply has a PT called the P-T442 . Which I got for about 16 bucks. Here are the specs :
Primary: 117 volt, 50/60 Hz
Secondary: 125 V, 15 mA
Filament winding: 12.6 volt, 0.3 amp
Mounting centers: 2″, U-bracket
Weight: 0.7 lbs.
Way more secondary current than we need (the doc says 500μA) and since we will have DC for the 12A*7 heaters, this thing can push twice the heater current required. (Hmm.. perhaps a second tube .. two different circuits side by side .. switchable or stereo… hmm..)
Where were we? Oh yes. The transformer is on the way, and cheep. Time to start crunching numbers and see if I really am getting any of this. More later.
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