A good friend inherited this beast from his uncle. It has to be the most ridiculous amp I have ever bought. Too big, too heavy, too loud, too stupid. Just like me.
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He thought it was a ‘74 based on the chassis serial number (A763xxx), but based on the features, it can’t be. It has the hated pull boost master volume on the front.
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And the back panel has a line out jack, output tubes matching and hum balance pot. Oh, and 135 Watts. It has to be an ultralinear from ‘77-78.
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Tube chart from these years doesn’t tell me much - no date stamp.
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closer look at the speakers - EIA code of 2857807. Rola’s from early ‘78? I suspect they are original, but don‘t know for sure.
I‘ll bust this beast open and see what it is for certain. What I am certain of is I’m glad I own a pickup and a hand truck.
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Yes - after @hogy ‘s post, I went out into the shop and checked it out. The back panel is labeled 8 ohms. I looked up the OT online (013691) and it has two output taps, green is 8 ohm and grn/yel is 16 ohms. The green tap is connected to the speaker jacks, g/y to the line out and the negative feedback line. And yes, the speakers are wired series on the left, parallel on the right and combined (16 + 4) for an 8 ohm load.
Interesting. That might have been a change when they went to 135 watts and UL. The earlier 100 Watt ones I have seen have all been 4 ohm with the 4 speakers wired in parallel.
the UltraLinear schematic calls for a 4 ohm load….4 x 16 ohms in parallel.
The back of the chassis definitely says 8 and looks original. Given Fender’s long history of not building to the schematic, I wonder if that was a mid production change? This is the first one I have seen that wasn’t 4 ohm, but I haven’t ever paid much attention to the UL era amps.
I had that feeling about my Twin, too big, too loud, too heavy, and that thing is like two twins! A quadruplet! Have fun blowing the windows out.A good friend inherited this beast from his uncle. It has to be the most ridiculous amp I have ever bought. Too big, too heavy, too loud, too stupid. Just like me.
![]()
He thought it was a ‘74 based on the chassis serial number (A763xxx), but based on the features, it can’t be. It has the hated pull boost master volume on the front.
![]()
And the back panel has a line out jack, output tubes matching and hum balance pot. Oh, and 135 Watts. It has to be an ultralinear from ‘77-78.
![]()
Tube chart from these years doesn’t tell me much - no date stamp.
![]()
![]()
closer look at the speakers - EIA code of 2857807. Rola’s from early ‘78? I suspect they are original, but don‘t know for sure.
I‘ll bust this beast open and see what it is for certain. What I am certain of is I’m glad I own a pickup and a hand truck.
![]()
Yes - after @hogy ‘s post, I went out into the shop and checked it out. The back panel is labeled 8 ohms. I looked up the OT online (013691) and it has two output taps, green is 8 ohm and grn/yel is 16 ohms. The green tap is connected to the speaker jacks, g/y to the line out and the negative feedback line. And yes, the speakers are wired series on the left, parallel on the right and combined (16 + 4) for an 8 ohm load.
Yea saw him with the long cord in San Jose sometime in the 80s.Yes, I saw him here in Lubbock in the late ‘70s in a small club…250+/- capacity. Wonderful night….That long coily cord’s capacitance took some high end out of the Telecaster’s signal…..no pain for me. He knew how to control things, imho.
Wild man!
Yup. My favorite practice amp is a Twin. No baloney. Cinematic indeed. It is a very involving sound stage, amps of that power, put out when you sit right in front of one.This is what people don't understand about "bedroom" amps and high power. They sound so good at any volume.