Anyone got Eico ST97 info?

[Trnsfmr]

Hi all, I don't post here very often, I'm usually on the Sansui forum. Several years ago, I bought an Eico St97, kind of on a whim. It was supposedly working well. It was, and I was actually blown away by the quality of sound. I recapped it, getting rid of all those Eico ceramic caps everywhere, along with the electrolytics. We have 3-4 high quality FM stations in our town, and this is the best tuner I've ever heard. Not many people talk about these things, but I have run into a few other postings where people agreed with my opinion.

Well, it's not working so well anymore, and I think it needs an alignment and maybe some parts. I have bought a few others units whenever I see one going for cheap, so I have a lot of parts. I have found a schematic, but cannot find the alignment instructions anywhere. I bought myself an old Heathkit tube stereo generator, and I know it's not the best, but it will probably get me close. I just need to know how the factory says to do it.

I've been studying what I can find, and there seems to be a lot of different ways to align a tuner. have never really done an alignment on one of these tube oldies. I align QRX Sansuis all the time, but there's hardly anything to it, what with the ceramic IF filters and multiplex on a chip, etc.

I'm kinda getting interested in these old tuners and any help or source of info would be greatly appreciated. Does anyone know anything about these old things?

Thanks.

The good one is the one on the upper left

 

[Patrice B]

I guess you're ok to repair your tuner with that lot of spares

Anyway, I know the ST-97 sports the same MPX circuit as the Eico MX-99 multiplex adaptor and there's a procedure to align the MX-99.

You could look at the Eico Yahoo group. They have the ST-97 schematic and the MX-99 could be found here: http://www.mcmlv.org/Archive/HiFi/EicoMX99.pdf

 

[Patrice B]

I guess for the IF's cans and the detector stage, you could follow a generic alignment procedure like the ones found in the Sam's schematics...

 

[singzh]

PM sent to you

I have the detailed manual.

I've had tube tuners from almost all the major brands at the time. (Sherwood TOTL S2100II (FM same as S3000V). FM-100B, Scott 350B, EICO ST-97). The EICO is the best.

 

[Trnsfmr]

Patrice, thanks for the MX99 link. I had heard the MX99 was the same, having that data will be great. It will be interesting to see if the ST97 manual has the same multiplex alignment procedure.

And Singzh, thanks. (he is sending me a scanned copy of the manual--Hooray!!) I'm jazzed about getting it. I also have a Fisher 100C that I have recapped and have it working pretty well in mono (no stereo), do you have any documentation on that one? It's a weird one, as the multiplex circuitry is SS.

Thanks to both.