Air holes around a transformer are unlikely to help cooling. But you could indulge in a spot of dual monolithic avicide (kill two birds with one stone) by adding a new transformer specifically for the audio valve heaters. In the UK, you can buy transformer kits from Maplin that have a split bobbin with a ready-wound primary and an empty chamber for the secondary. You then wind your own secondaries. You can gain some important advantages:
(1). Wind the 2.5V (2A3) windings with a centre-tap to help reduce hum. Do the same for the other heater windings, too.
(2). You no longer have capacitance from the HT windings to couple rectifier switching noise to the sensitive heater wiindings and thence to cathodes.
Oh, and.
(3). The reduced load on the existing transformer wil almost certainly allow it to run cooler...
(1). Wind the 2.5V (2A3) windings with a centre-tap to help reduce hum. Do the same for the other heater windings, too.
(2). You no longer have capacitance from the HT windings to couple rectifier switching noise to the sensitive heater wiindings and thence to cathodes.
Oh, and.
(3). The reduced load on the existing transformer wil almost certainly allow it to run cooler...
Appalling humour, but works in more than 1 language
°ìÀÐÆóÄ» one stone; two birds
dual monolithic avicide
°ìÀÐÆóÄ» one stone; two birds
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