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Ah. The plot thickens. So, removing power valves would increase the impedance. 4 to 8 ohms. This could explain the 8 being "painted" on the back panel.

So, if it is the same OT then the label on the back becomes a moot point. Problem solved, yes? Having said that I read the 100 and 135 were identical except for the obvious, EQ, master vol, power and the ultra linear output section. Now, having said that, I believe the 135 had a multi-tap OT.

So, shop manager went home. Will know something tomorrow. We know the previous owner has had some work done on the amp. I am of the opinion that the previous owner desired the tap setting on the Output transformer be changed. My question is, is it a simple case of having the tap setting changed back?

Oh, Bill that's awesome info. I can see clearly now... too much to think about... my head... You have an ability to put things into plain English that can be easily understood... very rare. I have only ever owned SS amps.

So, they guy is going to get me the code off the Trans and investigate how the output jacks are wired. Cheers.

So, the seller has sent me some pics but I don't think they are what you want to see or helpful. Hmmm. There have been many parts replaced over the years.

Rob. Put aside the mismatch side of things for the moment. "Total load 8 ohms" directly under the two output jacks suggests (if the jacks are in parallel) a MIN of 8 ohms. This then suggests a 16 ohm speaker into each jack. Hmmm

Bill, I have 2 2X15 cabs, each speaker 8 ohms and would like to run this but if the amp is MIN 8 ohms (Total load 8 ohms) I would rather not load it up. Don't have that much money to splash around getting it repaired. Why couldn't Fender just label it the way they did it on the Bassman 135? Having the one statement, Total load 8 ohms, under the two output jacks, does my head in! I know that for the amp's sake you should not put in less ohms than the stated MIN (only a higher amount), but it is hard to work out what that MIN is when I have also read that the two output jacks could be wired in series or parallel OR even have a disconnect feature when a lead is placed into one or the other output jack OR a combination of.

Thanks for the input (haha) Rob. The pic IS highly unusual and it is stopping me from purchasing the head. This amp has had a lot of parts replaced so possibly has a different output transformer like your Bassman 50 but it doesn't explain the Model number, CFA 7100 on the label and the Total load 8 ohms on the same label. It doesn't look like the 8 has been painted on either, having said that, it does look a little bit big.

Model CFA 7100 from the Silverface 1972 to 77

I have seen two Fender Bassman 100 heads that have differing speaker out load requirements written on the label at the back. One says "Total load 8 ohms" and the other head says "Total load 4 ohms". Both have two 1/4" out jacks. Some forums posts say the jacks are parallel and others say series. I don't think I have ever seen two out jacks in series before. The parallel wiring system seems industry standard. What is going on here?