Admiral 14R12 Restoration

[Crist Rigott]

The BK 415 is for the higher freq. IF TV's. It won't work for mine. Later today I'll get back to this chassis.

[Kevin Kuehn]

Originally Posted by Crist Rigott

The BK 415 is for the higher freq. IF TV's. It won't work for mine.

Unfortunately true. And as far as I'm aware there was never a rival service grade unit made for the old 24MC band.

[Electronic M]

Originally Posted by Kevin Kuehn

Unfortunately true. And as far as I'm aware there was never a rival service grade unit made for the old 24MC band.

IIRC the markers on the 415 were crystal based (I need to dust mine off and make it work) so with the right crystals and mods to the sweep section the 415 might be convertible to the older IFs...Could be an interesting project trying to make a 415 mod to switch back and fourth both IF freqs...Though it might be reinventing the wheel.

I recently picked up an example of that EICO generator you were using ($5 at Goodwill)....That makes ~6 pieces of 'as found' IF alignment gear I have sitting waiting for the day I decide to try and teach myself IF alignment...I really need to block off some time for that some summer or winter...

[Kevin Kuehn]

Originally Posted by Electronic M

Though it might be reinventing the wheel.

I looked into that and came to the same conclusion. The correct crystals are very difficult to find, and the project would get very involved before it was all said and done. A better use of time might be to design from the ground up a digital programmable 5 frequency marker generator that could be used as an add on with any of the service grade post marker sweep generators.

[Crist Rigott]

Taking a mini-break from this for a few days. Another quickie project has popped up.

[Zenith26kc20]

Not the first time I heard of "eyeballing" the IF strip. When I was a kid helping at a TV shop, there was a tech that did my Motorola TS905 and a RCA CTC16. Both sets turned out great! Amazed me to watch as he did them. He was a older ham operator who also designed and built a good bit of his gear. As a kid, that shop was a blast!!
I just wish I still had that old Motorola. It's biggest problem was it was huge! My mother was not fond of it in my bedroom. Took up way too much room!

[Crist Rigott]

Besides my mini project this week I worked on getting the back reconditioned. Much to my surprise it really didn't fit too good! I know when I got the TV it was barely on the TV and it really didn't fit so good.

I got to looking and the left vertical brace was installed to the back too high. It contacted the upper left mounting screw boss by a lot. OK, so I relocate the brace to match the good right side. I place the back into the cabinet and it is too high! The cutouts for the upper mounting holes won't line up. Hmm....

I decide to mount the chassis into the cabinet to see where the problem is. Well it looks like the outline of the back is correct, but all the holes, etc are about 1/4 inch high! My guess during manufacture, the blank outline wasn't inserted fully into the jig or machine that drills/punches out the holes! I also thought that there might have been some rubber biscuits that go under the chassis but there can't be because the controls shafts are centered on the cabinet holes.

There is no way to locate the elongated holes that mount the back to the chassis. I run out off the bottom edge of the back.

So I drew up a new back using my CAD program. I double check all the mounting holes to the chassis and to the cabinet. Much, much, better. Of course I have to make a new back now.

I've included some pictures of this whole mess.

[old_coot88]

Originally Posted by Crist Rigott

The BK 415 is for the higher freq. IF TV's. It won't work for mine.

By golly you're right. I had to look up the specs just to be sure. Amazing that it doesn't cover the old band.