Thanks for all the info.
First of all, I bought this FT-101E at a hamfest several years ago. A guy had around 10 Yeasu FT-101 vintage rigs. I bought what I though was the best of the lot for $90. It is a late run FT-101E. It does not have 11 meters on the band switch.
When I got it home, I noticed that all 4 of the OE 10 meter crystals were missing. The 160M crystal was also missing. There was an AM filter where the CW filter went. So I assumed it was a refugee from CB, but is was clean and I got it for a song.
The reason it would not work was the 13VDC supply was showing zero volts. Both diodes in the 13V power supply were open. That was an easy fix and the rig started receiving some what.
After piddling with it for a couple of sessions, I got it working quite well on 80-15 meters. I get good reports on the air. I can "hear" a -120 dB carrier on all bands from my HP 8640B signal generator. Power out is around 100 watts on all bands except 40M where I can only get around 70 watts.
Getting to the chase.
Today a friend brought his mint FT-101E to let me compare the rigs. Opened both rigs and I cannot see any differences. His rig has all crystals for all bands.
I swapped the 160M I bought on ebay from my FT-101E into his rig. The ebay crystal worked perfectly in his rig. Then I put the 160M crystal from his rig into my FT-101E. My rig went ballistic on some unknown frequency, but not on 160M.
Since my friend told me to keep his FT-101E for a while, this is where I left things for today.
I have a decent repair bench but most old equipment. The limited nut on the wheel is me. I have a HP 141T spectrum analyzer with tracking generator and an IFR 1200 Super and an IFR 1500 with all the options. Lot of other stuff like HP counters, HP signals generators, Tek scopes, etc.
Tomorrow I plan to sweep my FT-101E on the 160M band to try to see just which frequency it is working on. It sure is not 1.8-2.0 MHz.
But then I may just leave things as is and use the FT-101E on 80-10meters and leave 160M alone. I have around 60 boat anchor rigs that I restored over the years. All work well. When I got older I started buying rigs from the 1960's through the 1980's when I was younger and when I could only drool over them. I have many rigs that will cover 160M but my inner self generally won't give up. Time will tell.
Thanks for all the replies.
Dick AD4U