Quote:
Originally Posted by mhennessy
I can't find any data on-line about the Fidelity UA6, but I really doubt it would have been fitted with a 100VA transformer. Any idea what the power output would have been?
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Just doing a bit more searching - information on the UA6 is definitely thin on the ground - but a post here suggests that it's only 8-10 watts per channel:
https://www.vintage-radio.net/forum/...15&postcount=2
So, definitely not a 100VA transformer. More likely 30VA or thereabouts. Possibly 50VA at a push, but I seriously doubt that would have got past the bean counters at Fidelity
We don't know the rated load impedance, but as this was the early '70s let's assume 15 ohms. Let us also assume that the transformer is supposed to be 24-0-24, as I can't think of a good design reason to want 0-24-36. Finally, let's assume a pair of diodes is used to produce a single rail of around 35V unloaded. All that fits pretty well with the 8-10 watt power output, and actually isn't a bad fit for 8 ohms given the rail will sag quite a bit under the increased load.
Either way, in lieu of more information from Fidelity, that's my best estimation of what this transformer is (or rather, "was once"
) capable of.