I know this is an old thread, but I'm on a big Allmans kick right now. I was looking at those pictures again, and I actually don't think the Sunn head is a 1000s series, but rather one of the 60 watt amps. In the one picture where you can see the faceplate, you'll notice there's no big black rectangle on it where the name and model number should be, but rather it's all silver. This makes it seem like it's more likely a 60w amp, maybe a Sentura or Sceptre.