• Please note that Audiokarma will be offline briefly for updates early on Monday morning, September 28th.

After a Long Hiatus - I'm doing an FM-100B

Tim D

Super Member
So, after a long hiatus, I'm back in the game again. Got busy with life and work and just couldn't find time to get into the hobby. Well, I just picked up a second house way up north (from where I'm at in Florida) and needed to build up a second primary system with a Fisher tuner. (I have a fully restored Fisher 500B that has a Fisher tuner for one house and a couple of Fisher separate amps, but no extra Fisher tuners that are functioning.) I have a KX-200B amp but no tuner to go with it. In the queue was several Fisher tuners, a KM-60 (another one from one I saved before and gave to my sister), an FM-90B, a TFM-200 (hybrid), a couple of 1950's Fisher mono tuners (a 90-R and an FM-90X), and this FM-100B. I decided to start with the FM-100B.

It had a case that needs help and after opening it up, I found it has a full complement of Fisher tubes. I did pull it out and tested all the tubes and they test good in my Knight 600B Emission tester. Huzzah!

As a matter of course, I ordered a new can cap from AES (which has somehow changed its' name). I'll be cleaning it, restoring the case, recapping it all and checking resistors, adding an in-rush limiter, replacing the selenium rectifier and doing some updates that Professor Dave recommended in this thread (FM-100B: Fisher's Best Bang For The FM Buck). His opening post contains so much great info as usual! Of course I am going to do all this work without verifying the IF cans first (against recommendations because that is just me :p.)

Here is a pic of the unit before I get started. Of course it needs the usual knob brights. The front side of the case just snapped off. An easy fix. This case is a slightly different ventilation grid style than I'm used to. Wonder if it is Fisher branded or aftermarket, but it fits perfectly.

IMG_1667.png
 
Register to hide this ad
Thanks Steve. Glad to be back.

Looking it over and not finding anything visibly wrong with it. It hasn't obviously been touched. Still has the original Selenium rectifier (which I will replace.) I've built a spreadsheet of resistors to check and caps to replace. Next step is to check the resistors.
 
Thanks Steve. Glad to be back.

Looking it over and not finding anything visibly wrong with it. It hasn't obviously been touched. Still has the original Selenium rectifier (which I will replace.) I've built a spreadsheet of resistors to check and caps to replace. Next step is to check the resistors.
I'm working on a 500-C that has an issue and driving me bonkers. Posted a thread on it.
 
Back
Top Bottom