Yes,
For any integrated with five tubes up front instead of six, the absolute phase is off.
fisherx100a.wordpress.com you can see from here.
real x 100A or x 100 2
That circuit is the same as the one (incorrectly) labelled X-100-A at http://www.one-electron.com/FC_Consumer.html and mentioned by ciscokid and also at http://www.tubesrit.com/audio/thumbnails.php?album=38. It uses 7591s in the output (with 430V plate, 360V screen), whereas the real X-100-A (& X-100-2) use 7189s (the military EL84M should be OK too) with 390V plate, 340V screen. The input stage looks much the same, but the phase inverter voltages are different, and since the output stage 7189s have 18V on G1 vs 26V in that other circuit, the cathode bias resistors/heater values are different, as is the feedback resistor & cap, at a glance. I have right here a genuine Fisher X-100-A/X-100-2 (the "2" is in a subscript) service manual (well, most of it!) including the schematic, but my scanner is packed away. I'll try to remember to upload it (and write to one-electron.com!) when I can. I can confirm it does look the same as the one at Fisher Doctor, http://fisherdoctor.com/pictures/fisher/amps/x-100-2.jpg. Really 390V is too high for plain EL84/6BQ5 (300V design-centre) so they may not last too long if you try to use those. Hope that's useful meanwhile!
I'm more than happy with my Scott 299A but I couldn't help the compulsive purchase of a Fisher X-100 (X-100-3? X-100-A?) for $120. It's the model with four 7189's, five 12AX7's, and all of the plastic control knobs are the same size.
It looks brand new, with all of the original paperwork, schematic, and a bunch of Fisher advertisements. The original owner said he bought this one, listened to it a couple times, then built his own amp. He said this amp sat in a closet for 40+ years.
My live-in girlfriend hates my stereo collecting and this amp immediately went into storage. So I feel inclined to sell it, but I'm still very curious about how it would stand up against my Scott 299A. Any thoughts?
Also, this amp came with a quad of Fisher-labeled Mullard 7189's with supposedly very few hours on them. I plan on yanking them, as the original Amperex 7189's in my Scott are getting a bit worn out. Would Russian Reflektor 6n14n tubes work in the Fisher x-100 or would they get fried rather quickly?
It looks brand new, with all of the original paperwork, schematic, and a bunch of Fisher advertisements.
My live-in girlfriend hates my stereo collecting and this amp immediately went into storage. So I feel inclined to sell it, but I'm still very curious about how it would stand up against my Scott 299A. Any thoughts?
Man, you need another girlfriend. The way I look at it is your not out drinking, gambling or consorting with other women when you are enjoying your stereo collection. That should be enough.