06-10-2019, 04:36 PM
Looks good.
One tip: wire up your mains transformer, to valve heaters. Wire up your output transformer to your loudspeaker. Switch on.
You may notice a hum in the speaker. It's because there is a small AC field from the mains transformer, which the output transformer picks up. If so, move the transformers around a bit, for minimum hum. You may find turning one you can find a zero position. Only then, mark and drill the positions for the fixing holes.
Some radios do seem to have transformers at weird angles, as though someone had just thrown them down at random, rather than in a nice neat layout. I rather suspect it was for minimum-hum reasons.
One tip: wire up your mains transformer, to valve heaters. Wire up your output transformer to your loudspeaker. Switch on.
You may notice a hum in the speaker. It's because there is a small AC field from the mains transformer, which the output transformer picks up. If so, move the transformers around a bit, for minimum hum. You may find turning one you can find a zero position. Only then, mark and drill the positions for the fixing holes.
Some radios do seem to have transformers at weird angles, as though someone had just thrown them down at random, rather than in a nice neat layout. I rather suspect it was for minimum-hum reasons.
