FM 200B - What am I missing? (part) and Jewel recommendation

Send it(200B) my way. I know what to do with it:D:D You did good Matt.
My KM-60's face plate is the same color. Looks funny next to the silver faced X-101-B. Oh well.

The 100B is a very sweet tuner. I rehabbed AK member Rogerfeder's last year and he almost didn't get it back after I did a full recap, and aligned it.
 
I have a super crappy KM60 to do after the 100B - them an FM100c and a TFM300. Tuner days for me! But after that time to tackle some SS amps.
 
Larry, what do use for alignment? I think it's time I bought the equipment needed to do alignments. I've got probably 15 units that could use their alignments at least checked. I've had my eye on eBay for months for one of those FIsher 300 units, but haven't seen one.
 
Find a Sencore SG-165, and make sure it comes with the accessory cables. You can pretty much do everything you need with it and a o-scope. I end up just peaking the 10.7 and then tune to a weak station and repeak for maximum reception using headphones and the stereo beacon or meter on the unit. Read the KM-60 Manual, it shows you how to do it without equipment and just plastic tweakers. It's close enough for horseshoes and then you can compare that with the sencore SG-165 and a scope. The Early 400 follows the same route, and you can do a late one as well but the last transsformer is backwards on the instructions.
 
Matt -- If/when you get the alignment equipment, if I may, I would suggest that you first practice and hone your skills on a simpler type of tuner. This is not to suggest that the work to align a 200B is hard per se -- or that you won't acquire the necessary skills, but rather to suggest that it does require some definite skill to do properly. The usual problems that result from a less than skilled alignment effort include a Microtune circuit that de-tunes the tuner after letting go of the tuning knob, an AFC circuit drawing the tuner into an adjacent stronger station rather than the target station, or the Microtune/AFC circuits knocking the Stereo Beacon off (back to mono mode), when it was initially tuned to engage the stereo circuits. There are other issues as well, but these are some of the more significant common issues I've seen on the 200Bs I've received that had previously been "aligned". Just a heads up for you to be aware of. In particular, because of the AFC feedback path around the IF Strip in the 200B, proper alignment of that portion of the tuner is critical.

Good luck with it!

Dave
 
Last edited:
I plan to practice aligning tube tuners during the next months, but as Dave said, I'll probably begin with some mono tuner like my little Eico HFT-90. I would never begin with my 200B even if I doubt that it is not optimally aligned...
 
As Matt has a KM-60 and it has the tool less alignment instructions in the manual, I suggest that he start with that procedure(leaving the MPX ALONE!) to get the feel of the transformers coils and trimmers, then tweak it using the tooled procedure with the Sencore and a Scope once he gets them. If he has an Early 400 receiver he can use the KM-60 procedure on it. Once he gets that down, then move on to something a little more involved, under instruction. Each tuner is different in it's own way, even from the same manufacturer, (see Daves comments in post 46) adding different bells and whistles, which adds complexity to it, and adds to the level of grey hair on your head (or lack of if you tend to pull it out in clumps while vocally exercising less than socially acceptable words under the 1st amendment.). The last thing I suggest he should learn is the multiplex.
 
Okay - i guess I'll round up an oscilloscope and the Sencore and pull the KM60 out of the box. I have 2 early 400's and the FM100B I can 'move up' to.

Looking forward to the challenge.
 
Trying to find the panel jewels at Mouser but not hitting. What are they called officially? Maybe a link if you have one.
Thanks, John
 
This brings up amber: 593-2000A

Knock yourself out:
LED Lenses Fresnel Lens Cliplite 3mm VCC 0.19 in LED Lenses VCC LED Lenses

:D
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom