Mercury TV-220A restoration

[bandersen]

That tuner struck me as odd right away. Eventually, I found some service info in Riders vol 6 and 8.
It looks like Mercury was only around a very short while and only made sets with this basic chassis which is also listed under S.M.A. I don;t know who S.M.A is, but I'm guessing they made it for Mercury.

Vol 6 contains several pages of theory, alignment info and several schematics none of which quite match. Vol 8 has a one page schematic that seems to match very well.
Here's a link: https://drive.google.com/file/d/0B37...ew?usp=sharing
Couldn't find anything from Sams.

Now I can see that the tuner is a continuous type using 6 variable inductors. It covers the VHF low, high and FM bands. Supposedly, it also cuts juice to the horizontal circuit while in the FM band. I'm curious to see that in operation
It seems to be frozen right now. Hopefully, some carefully cleaning and lubrication will take care of that.


I did all I could with the 16RP4 CRT, but can barely coax any emissions out of it. Luckily, I have a spare 16KP4 aluminized version that should fit perfectly.

Because it's so pristine I figure I'll restuff all the caps. I have a few outstanding projects to wrap up, then hope to dive right into it

Meanwhile, any info on Mercury or S.M.A. would be much appreciated.

[jr_tech]

Originally Posted by bandersen

That tuner struck me as odd right away. Eventually, I found some service info in Riders vol 6 and 8.
It looks like Mercury was only around a very short while and only made sets with this basic chassis which is also listed under S.M.A. I don;t know who S.M.A is, but I'm guessing they made it for Mercury.

.....snip....

Meanwhile, any info on Mercury or S.M.A. would be much appreciated.

Oddly the same eBay vendor that listed the Mercury TV brochures also has some trade show pictures featuring S.M.A. , Chicago:

http://www.ebay.com/itm/TELEVISION-P...MAAOxyThVTX-ny

jr

[bandersen]

Originally Posted by old_coot88

That canvas strap holding the jug on might be deteriorated enough to break easily. This has been the case with some split-chassis Philcos with canvas straps securing the CRT.

Not to worry - there's a steel band underneath the cloth.

Originally Posted by jr_tech

Oddly the same eBay vendor that listed the Mercury TV brochures also has some trade show pictures featuring S.M.A. , Chicago:

http://www.ebay.com/itm/TELEVISION-P...MAAOxyThVTX-ny

jr

I think I see this tuner down at the bottom.

[Polaraligned]

Originally Posted by bandersen

Because it's so pristine I figure I'll restuff all the caps.

That is impressive. Most guys just give their chassis "yellow" disease, unless it is a particularly rare and valuable set.