Philco 19MT79 roundie-hybrid

[Charlie]

Spent thisevening bringing up the Philco chassis slowly with a variac. After several hours, I was glad to see nothing went up in smoke. It seems that all of my B+ voltages are good, and the electrolytics are running cool. Even the tuning indicator has a good glow.

The power switch was bad, so that is bypassed for now.

I had hoped to be able to at least get some audio, but seems it won't be today. I did some poking around and found a possibly bad transistor on the first IF. Voltage reading at the emitter is supposed to be around 3 volts, and I am getting nothing there. That kinda bites... this is the part where I wish it was all tubes!

I thought about plugging the horizontal tubes back in to see if there was any HV, but getting tired and don't feel like loose HV flying around.

Here's a few shots on the bench. The tuning indicator...

[Charlie]

Chroma board before shot...

[Charlie]

Chroma board after shot. Boy this chassis was dirty!

What did you use to clean that chassis? I suppose a ball peen hammer and a cold chisel might be a touch too abrasive?

Anthony

[Charlie]

I used the vacuum cleaner and one of my ex-wife's make-up brushes. The little brushes are delicate, but effective.

I can't use the garden hose here at my house because I have well water, and it's pretty hard... leaves spots and calcium. I realize that sounds korny, but the water here really spots as it dries. If I want to "wash" the chassis, I take it to my parents' house and use their garden hose.

[Jeffhs]

Charlie,

I wondered what that pic of your set's channel selector was supposed to be showing, then I saw the caption above it. Looking more closely, I thought I recognized the tuning eye tube. That set must have been one of Philco's high-end consoles with the shadow-bar tuning indicator (made in the mid-to-late '60s, some years before AFT circuits were anywhere near popular--I saw a picture of one of those sets in an article on '67 color sets in Popular Mechanics magazine, mid-67 I think it was, IIRC).

BTW, how well does the set work at this point? Have you checked it for HV yet? (I realize in your last post you said you had not checked for HV at that stage, but I was wondering if you've checked it since then.) If so, how is the picture?

BTW (2): Was that set in a console cabinet or was/is it a table model? Seems to me Philco only offered the tuning-eye sets in console style cabinets.

[Tubejunke]

Charlie, would you shoe us some shots of the exterior of the set. I have been interested in seeing a late roundie and I'm sure eveyone woud enjoy a look at your set...

[Charlie]

Jeff,

Haven't messed with it for the past few days. The day after I made the last post, I decided to go to camp for a few days to cut grass, make a few home improvements, and get things ready for a bar-b-q this coming weekend.

In the meantime, I am waiting for a transistor to come in the mail for the IF strip. The CRT in the set is toast. As of now, I have not tried the HV. If all turns out well and I can get the cabinet looking good, i'll put one of my new CRT rebuilds in it.

This set is a console on legs. Here's the photo again...

[Charlie]

Having trouble uploading the picture, but you can see the photos of the set in this other thread...

http://www.audiokarma.org/forums/sho...5&pagenumber=2

[Charlie]

I got a replacement transistor for the 1st IF in the Philco. Now I have a delima. The trans. in the set has 3 leads. The replacement has 4. Now what?!

I double checked the cross reference to make sure I had the right part. Here are the numbers.

Original Philco part #TV15A = NTE161 = ECG161

i have the ECG161 for the replacement. Could this be incorrect? Or is one of the extra leads on the replacement not used in this particular application? If so, which do I omit?

[polaraman]

Nice looking set. I know this is a rectangular set but it is close to yours. I would think that this set is a parts set. All I would ask for is postage fees. What do you need?

Polaraman

[polaraman]

It is a hybred Philco tube set. It has I believe 16-17? tubes. I got it last night from a local Tv repairman. It was free. Thought I could help myself or somebody out. Chassis view.

polaraman

[Charlie]

Polar,

Looks like the shop forgot to include the neck of the picture tube!

Looks like the little door on yours is missing... just like mine. That's the only thing I can think of right now. Thanks for the offer. If I come across something, I'll let you know.

For now, I'm trying to figure out what to door with the extra leg on the replacement transistor I got.

[Tim]

Here is the datasheet for the NTE161. The fourth lead is the case.

http://www.nteinc.com/specs/100to199/pdf/nte161.pdf

[Charlie]

Thanks, Tim, for the info. That helps a lot!