by jwhitmor » Sat Dec 07, 2019 10:12 am
There are far more capable people than me, to answer that. Just looking at Tom's photos, I would say the essential parts are the (front mounted) attenuator, an output selector switch, and a stereo phone jack. Looks like the signal is off of the speaker terminals. I think that would be fine for headphones up to say, 32 ohms. For headphones that are 600-2000 ohms, I would think that a small audio grade impedance matching transformer could be a worthwhile addition. Not sure what would keep you from smoking the phones, by having the volume set too high. I developed the habit years ago of turning the volume to zero, before turning my equipment off. That was in prehistoric days when the amplifiers could, and often did, "thump" when the power was switched.
If it is not making X-rays, your B+ is too low.