30-05-2013, 08:27 PM
(30-05-2013, 04:30 PM)Yorkie Wrote: The thing about the DAC90A dial lights (in the context of the DAC90A the term 'light' is something of an oxymoron), is that even if you can find the right bulbs, the dial is dimly lit. Some say that this is simply a characteristic quirk of the set, but really, what's the point of dial lights that aren't fit for purpose?
David.
Exactly, David: that was one of the significant points I raised in my initial post.
Just out of interest and fascination, etc., I did do some sums to see if a simple mod. could be done to fit 'standard' 6.3v 0.3 A bulbs. Of course, that doesn't work for two main reasons: (a) there is only 100 mA in the heater chain as it is and, alternatively, (b) fitting a shunt resistor to feed an extra 200 mA to the bulbs requires a dropper resistor that then dissipates a great deal of heat . . . and as we all know, it's the heat from the dropper (as fitted - and that heat being a lot less that that from the proposed dropper) that tends to cause discoloured cracks in the cabinet.
Interesting idea, though, about fitting a small mains transformer to power two 6.3 v. 0.3 A bulbs separately from the rest of the set: I assume that there is space on the chassis to fit it. I'll have to have a look in my transformer box to see if I have a suitable item: either a 6.3 v. or a 12 v. secondary winding one should do (assuming the current capacity is adequate - which, of course, is not a lot).
Anyway, I'm glad you brought this to my attention: thanks . . . but I wonder why I didn't think of that solution . . . perhaps because it is too damn obvious!
Al.
