Crosley Model ??

[Doug66]

I picked this up on ebay earlier this year and decided to hold it for a winter project. I'm between projects now and am off work this week, so I thought I'd at lease assess it. I have done a power up and get static in the audio but no raster or signal neither on TV or FM.

Anyway, there is no model # on the set. I see a similar looking set on the ETF database. Does anyone know what model this is. I'd like to look at the schematic before pulling the set from the cabinet.

Thanks
Doug

[Kevin Kuehn]

Looks like one of the 9-403 variety.

http://www.earlytelevision.org/pdf/c...403-rider3.pdf

Unfortunately that Riders scan is very difficult to read. It should also be in
Sams 79-4

[Doug66]

You're right Kevin, the Riders posted is hard to read. Maybe I can locate a Sams, which I'd rather use anyway.

So far, I've removed it from the cabinet and found it caked in dust EXCEPT for the octal tubes which I assume are or the horiz and vertical and rectifier. Those are perfectly clean which makes me think someone tried to work on it and gave up after replacing some tubes. I haven't turned the chassis over yet to look underneath.

[Electronic M]

That likely is a Crosley badged Dumont chassis.

[Doug66]

Well I just finished familiarizing myself with it underneath, and it looks to be unmolested. It looks like all the aps are the original ones. I am going to carefully start replacing the paper caps and check the CRT. The base is loose, so I'll need to re glue it.

One thing I do find odd, is that it does no have a Hi and Lo switch for the TV tuner like other continuous sets have, just a TV and FM position.

[Kevin Kuehn]

Doug, pm me your email and I'll try to send you a scan of the Sams later tonight. Will also send it to the ETF so it can be downloaded.

[Radiotronman]

Yep, I believe Kevin is right.

[oldtvsandtoy]

I have the same set in blonde if any buddy want to make a offer on it let me know.

[David Roper]

It's more like a quasi-clone of a Du Mont. Du Mont never offered any set with a 10" screen, nor in that particular configuration. But yeah, Du Mont engineering slightly re-envisioned.

[Phil Nelson]

Originally Posted by Doug66

One thing I do find odd, is that it does no have a Hi and Lo switch for the TV tuner like other continuous sets have, just a TV and FM position.

If it's a DuMont RA-103 clone (or near-clone), that wouldn't be surprising. My RA-103 doesn't have Hi-Lo switches for TV channels, either.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[Doug66]

I was up around 2AM this morning replacing paper caps. I've got about half of them done. I haven't done any electrolytics yet because I've got to order most of them.

The good news is I now have high voltage. The fuse in the damper circuit was open, and I just replaced it and the results are shown. Also both candohms are good.

The bad news is my 10BP4 is not usable. I put it on the checker, and it barely had any emissions. I accidentally bumped the connector, and the socket cap came off. Trying to repair that resulted in a lead breaking off right at the glass. I'll have to locate another CRT when restoration is near completion. Right now, I've got my 5" test CRT in place.

I still can't get a signal to come thru either on TV or FM.

[Doug66]

I wanted to give a progress report. I just finished restuffing the last electrolytic can (4 cans total). I've got 2 tubular electrolytics to replace still. One is in the audio section, and one is a filter in the focus coil network.

All I can get is a horiz line across the screen. I've replaced all caps and most resistors in the vertical circuit. I was hoping this last electrolytic can would solve that as 2 sections were tied into the vertical.

I am now getting an audio signal, but it is way off on he continuous tuner. Ch 3 (cable) is coming in below channel 2. The FM band is coming over the TV band starting around Ch 5. Nothing is coming through with the band switch in the FM position.

I hope the tuner is not out of alignment. I read the alignment instructions today, and the Sams said the tuner is so difficult to align that it recommends replacing the tuner instead of realigning it.

Right now, I need to concentrate on the vertical section and try to get an image on the screen.

[Doug66]

The vertical issue was caused by a bad 6SN7 vertical tube. I finally have a raster but that's it. No video signal. The audio signal is a little distorted, but I'm hoping the electrolytic in the audio section, that still needs replacing, will clear that up.

The retrace lines seem to react when I tune the Tv into a station even though there is no video signal.

[Kevin Kuehn]

Sounds like you've got a sync signal getting to the sweep circuits, but no video to the CRT. The video is DC coupled from the plate(pin 6) of the Video amp(V8B), through L24, then directly to pin 2 of the CRT. L24 is a 4.5mhz sound trap. You could check L24 for continuity, or even try a jumper across it.

[Doug66]

First thing I did was try another 12AU7 which did nothing. The voltages on that tube are in line. I'm having to use the voltage chart in Riders instead of Sams. Sams has me checking some voltages with the negative on pin 6 of V15. That is giving me a zero reading. Riders is having me check against ground, and the voltages and near normal. I had that same problem when I checked the voltages on the vertical output tube.

Anyway, pin 6 gives me the right voltage. L24 has voltage on each side and checks good. Also tried jumping it which didn't help.