I don't know what to say. One moment I find myself thinking that this could represent "the best of both worlds." A minute later I'm thinking that this thing is a horrible chimera. And it has a whiff of audio fool-ism about it, don't you think? Will it work better with oxygen-free cables and gold-plated fuses?
Still, overall -- pretty cool.
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It's all about the warm glow of the tubes and the slight 60 Hz hum which in known to enhance any content. Look for an old AM broadcast radio at a garage sale with a low level "phono" input and see for yourself. I wonder if any vintage ham rcvrs have a phono input?
ReplyDeleteBob
wm6h
Forgot this is the literal internet. Just kidding about the 60 Hz.
DeleteI have a early 50's Hallicrafters S-53A that has a phono input jack in the back. It is switched in by turning the RF Gain control all the way CCW.
DeleteDoug - W8NFT
Thanks Doug. I see the Hallicrafters SX-100 does as well. Google shows circuits to convert Raspberry Pi audio to phono input.
ReplyDeleteI wonder if this circuit would adapt to using a 12AF6 tube. It is the same pin-out as the 12AU6 (pentode) but uses just 12 volts on the plate. A bit lower transconductance, but using headphones it should prove to be doable. This would make an interesting hack. Bruce - KK0S
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